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Solar PV inverters need to do more than ever before. Solar PV inverters in 2024 must interact with the grid (UL 1741), offer more options to meet rapid shutdown (UL 3741), and ease the inclusion of battery storage. The 2024 Solar PV Inverter Buyer’s Guide showcases all of that and more — from microinverters to hybrid solar + storage inverters to large-scale PV string inverters.
As part of the 2024 Solar PV Inverter Buyer’s Guide, we asked the 15 manufacturers listed how the latest solar inverter advancements impact other areas of solar PV design, procurement, and long-term performance. Here is some of that product pro insight.
What inverter or MLE innovation has changed larger-scale PV procurement and design? “C&I string inverters are designed with higher MPPT DC input currents up to 30A, which makes these devices adaptable to the rapid changes in solar panel sizes for years and installers don’t have to retrain their crews often,” says Michael Mendik, Country Manager US/Canada, GoodWe. “This means, no concerns about matching optimizers to panel changes. Smart fans, higher frequency power electronics, and sophisticated heat sinks reduce the risks overheating.”
How can inverter selection lower other costs (like BOS or O&M) in C&I? “PV string inverters did not have the communications that were innovated by U.S. MLPE [module-level power electronics] companies where customers received detailed information from each inverter in the field. Now, with utility grid interoperability being the law of the land, PV string inverter monitoring platforms are now 2-way communicating platforms and provide much more granular information from the field. This information will make truck rolls more efficient and cost effective,” says Terence Parker with Solis Inverters.
“Labor costs are reduced thanks to the 4:1 nature of the microinverter pairing with 4 PV modules,” says Jason Higginson, Head of Marketing, North America, APsystems. “This also eliminates the need to install an optimizer or rapid shutdown device at every PV module. Also, since the inverters are located behind every 4th panel, there are no string inverters or parts to mount on a wall or in a utility closet, thereby eliminating the labor, equipment, and space needed and simplifying the installation.”
“Regarding multi-megawatt ground mount systems, a ‘centralized architecture,’ also known as ‘virtual central’ or sometimes ‘modular central’ designs, where many string inverters are co-located with a transformer near the point of interconnection, minimizes AC line losses and maximizes power delivery to the grid,” says Tyson Schoelzel, strategic sales manager C&I, SMA America. “While a centralized architecture has advantages on CAPEX, like trenching, labor, wire, and balance of system (BOS) costs, it also impacts OPEX.”
The Solar Inverter Buyer’s Guide starts with Solis, the sponsor of Inverter Month, and then continues in alphabetical order. Each manufacturer tells us what’s new this year, and updated all of their product information. Click on any product name to expand the section and get more information. If you’re interested in the financial health of a specific inverter manufacturer, check out the latest rankings from Sinovoltaics.
What’s new? SolisHub, a new microgrid interconnection device (MID). This line side connected energy management tool, Solis believes, will be the new paradigm in residential solar. With comprehensive mobile apps, homeowners gain full control over their PV system, battery, fossil fuel generator (if applicable), and specific home loads that they can turn on or off. Solis has also white-labeled the S6 hybrid with Fortress, which offers the Alure, the Fortress-branded MID. But Solis U.S. is now offering a larger, Solis-branded energy hub that we believe customers will fall in love with.
Solis continues to work with the top PV module racking companies that have developed new UL 3741 solutions to reduce the amount of MLPE required within the PV array boundary for rapid shutdown compliance. This is saving contractors up to 9 cents per watt on their rooftop jobs.
Solis US is also expanding its utility-scale offerings. Solis has released a new AC combiner Box (1000A Switch) that can combine 2, 3 or 4 inverters. This utility-scale solution, where customers can combine multiple PV string inverters into 2-4 MW assemblies that can then connect to the new Solis U.S. Utility Skid. These skids fit into a 20-foot container and include low and medium voltage switch gear, an MV transformer, racks for SCADA, etc.
This new Solis US residential hybrid inverter [S6-1P(3.8.11.4)K-H-US] is a combined grid-tie inverter and battery management inverter in a single enclosure. These new hybrids feature Bluetooth connectivity, 120/240 split phase output and are certified to the latest IEEE 1547-2018 interconnection standard, HECO, Rule 21 Phase 3 and UL 1741 SA & SB standards. These inverters include a PCS, an inverter bypass switch, and high-amp MPPT inputs to easily accommodate the largest PV modules on the market today. The new Solis hybrids can deliver up to 50 amps continuously and a surge current of 76 amps for 10 seconds. Solis hybrids can be paralleled for greater power delivery to the backup loads using a simple CAN bus connection. Finally, whole home solutions can be delivered to the customer using the Solis S6 hybrid(s) and the SolisHub.
Key specs:
UL (US and Canada) listings: UL 1741 SA & SB, UL 1699B, UL 1998
Interconnection / Interoperability: IEEE 1547-2018, IEEE 1547.1-2020, IEEE 2030.5
The Solis S6 (Series 6) inverters are optimally designed for three phase commercial rooftop PV projects (e.g. multi-family residential) with an interconnection grid voltage of 208V. These new inverters can also be used at sites with 240V high leg delta grid connections. PV string current from the largest PV modules available today can be combined in the field, up to 40 amps, without fusing. Featuring high-amp Staubli dc inputs and a very wide full power operating range, the new Solis 30K LV inverters offer installers superior design flexibility. The NEMA 4X enclosure is relatively compact and lightweight. The inverter has both a dc and ac switch, where the AC wiring box/switch is removable for easy swap-out.
Key Specs:
UL (US and Canada) listings: UL 1741 SA & SB, UL 1699B, UL 1998
Interconnection / Interoperability: IEEE 1547-2018, IEEE 1547.1-2020, IEEE 2030.5
The Solis S6 250 kW inverter is the latest 3-phase utility-scale inverter from Solis US. This inverter follows the form factor and high-reliability design that Solis offers across their US 1500V commercial product lines. However, this product allows for high voltage PV arrays while configured for wiring to the common 600V 3-phase interconnection voltage.
This inverter features multiple DC disconnects and flexible communications connectivity (Fiber optic, Modbus RS485, Ethernet TCP/IP, PLC). This new inverter also features data recording during ride-through events – 10 millisecond sampling of frequency, AC current, AC voltage, DC current, DC voltage and Fault.
By using multiple PV string inverters to create a larger inverter solution, owners get the redundancy and reliability that PV string inverters bring to the table, while enjoying better performance and less costly OPEX. Solis is continuing to see interest in using our 1000V and 1500V inverters in repowering projects.
Key Specs:
UL (US and Canada) listings: UL 1741 SA & SB, UL 1699B, UL 1998
Interconnection / Interoperability: IEEE 1547-2018, IEEE 1547.1-2020, IEEE 2030.5
Size / category: Residential and Commercial Inverter Wi-Fi / Cellular Data Logging Device
The best “combination” Wi-Fi / Cellular data logging communication device on the market. NEMA 3R, plug-and-play connection to the Solis inverter external comm port. Powers up and begins broadcasting with 2 minutes. Default Wi-Fi to the local router. However, if the router fails, within 2 minutes, the W4G “stick” finds the nearest GSM or LTE cellular tower. No breaks in data, ever. Physical reset button and three (3) LEDs on the front tell the installer what the device is doing. The Solis Wi-Fi / Cellular “stick” is a data logging communication tool that can broadcast data from as many as ten (10) Solis residential or commercial PV string inverters daisy-chained with Solis cords or CAT5e cable. The S1-W4G-ST is also a great troubleshooting tool. Using the S1-W4G-ST, an installer can connect any Solis inverter to the nearest cell phone tower and see if the inverter is broadcasting data to the Cloud.
Solis website | Solis Inverter On-Demand Webinar
What’s new? APsystems’ introduced its APstorage ELS battery inverter line, which is battery-agnostic for seamless connection with various leading battery models. APsystems also offers its APbattery for customers who don’t have a battery preference. The ELS series integrates seamlessly with APsystems’ DS3 microinverters, creating a fully integrated solar + storage solution. The smart ELS battery inverter features intelligent energy management and supports backup, self-consumption, and time-of-use modes to secure critical loads and enhance energy savings.
1. The DS3 is the most powerful dual microinverter in the world. Three models cover most all panel types, sizes and capacities.
2. Far less equipment and at a lower cost. Competing systems require up to 3X the inverters and up to 60% more PV modules on the roof to hit the same output.
3. It installs faster than conventional microinverters and is simple plug-and-play.
4. Built-in Zigbee 2.4GHz wireless communication creates a mesh network for high-speed data transfer.
5. Fully NEC 690.12 and UL 1741 SB (CA Rule 21) compliant.
The QT2 is a 3-Phase microinverter for C&I applications. Each QT2 connects to up to 4 PV modules, is rapid shutdown and UL 1741 SB (CA Rule 21) compliant and comes in 1728W (208V) and 1800W (480V) output models. Why microinverters in commercial solar? As featured in the recent Solar Builder article “Making the case for microinverters in C&I solar,” the QT2 offers built-in rapid shutdown, pairing with higher capacity PV modules, improved performance over string inverters under a variety of conditions, fewer potential points of failure, plug-and-play three-phase wiring, and bonus: microinverters are now more cost-effective than ever!
The APstorage solution is a battery agnostic AC-coupled solution. Installers can choose from a variety of compatible low-voltage batteries. It can be used as a partial backup home system upon grid outage, allow homeowners to operate in self-consumption to limit grid usage, or to take advantage of time of use rates to offset electricity costs.
Because it is AC-coupled, batteries can be charged from any grid-tied solar inverter. During a grid outage, DS3s can be to charge the batteries.
Key specs:
UL listings: UL1741SB, UL 9540
What’s new? Enphase is working on an end-to-end energy solution with solar, battery, EV charging, and energy management software. The IQ Battery 5P, and the IQ EV Charger with intelligent control and monitoring capabilities, integrate with the Enphase Energy System to enable green charging. Enphase rolled out a suite of products and services to maximize value with NEM 3.0 in California. This includes an optimized Enphase Energy System, powered by IQ8 Microinverters and IQ Batteries. Solargraf, Enphase’s design, proposal, and permitting software platform, can help installers design systems that optimize solar and battery capabilities under NEM 3.0. The IQ8 product line is also expanding, including the IQ8P-3P for the commercial market, and the IQ8HC and IQ8X for high-powered solar modules.
IQ8 Microinverters are UL Listed as PV Rapid Shut Down Equipment and have more than 1 million cumulative hours of power-on testing. IQ8 also unlocks new backup power opportunities for customers and sales avenues for installers. In addition to providing sunlight backup for the first time ever, typical storage sizing and ratio restrictions no longer apply with IQ8. Installers can add a range of battery sizes to customers’ homes and expand their systems over time as needed.
The IQ8 Commercial Microinverters are built to support the small commercial solar industry by simplifying the design and installation process, improving energy harvest with higher uptime, expanding system monitoring capabilities compared to similar solutions, and offering industry-leading safety through an alternating current (AC)-based system using low-voltage power. The microinverters are compatible with a wide range of solar panels including 54, 60, 66, 72, and 144 cell panels with full or split cell, and with a range of 380 W to 640 W, making the products viable to support projects now and in the future. The distributed architecture of the Enphase system makes designing projects more seamless by reducing complexity and enabling an optimized panel layout for maximum energy harvesting on crowded or shaded small commercial rooftops. All IQ8 Microinverters activated in the United States and Canada, and a 12-year warranty for products activated in Mexico.
Key specs:
UL listings: Meets CA Rule 21 (UL 1741-SA) and IEEE 1547 (UL 1741-SB) requirements
With peak output AC power of 384W, IQ8HC, and IQ8X Microinverters are designed to seamlessly pair with a full range of solar modules up to 540W DC. IQ8HC Microinverters are available for all of North America and can manage a continuous DC current of 14 amperes, supporting higher-powered solar modules through increased energy harvesting. IQ8X Microinverters are available in the United States, supporting solar modules with higher output DC voltage and cell counts, such as 96 cells, 80 half-cut cells, and 88 half-cut cells. The high-quality manufacturing process and low failure rates unlock an industry-leading 25-year warranty for all IQ8 Microinverters activated in the United States and Canada, and a 12-year warranty for products activated in Mexico.
IQ8-HC
IQ8X
UL listings: Meets CA Rule 21 (UL 1741-SA) and IEEE 1547 (UL 1741-SB) requirements
What’s new? 2024 is a year of opportunities for Fronius USA. Future products are on the horizon and their Primo and Symo Advanced string inverters are fully available and in stock for purchase through our premium distribution partners. The Fronius Symo Advanced string inverter is expanding its certification reach with UL 3741 compliant flat roof mounting systems. Fronius also launched a Repowering Tool in the US that allows technicians to find compatible string inverters to replace dated or out of warranty inverters – restoring and modernizing older or defective systems back to full capacity. They also added an extended 12-year warranty.
With power categories ranging from 3.8 kW to 15.0 kW, the Fronius Primo is the ideal compact single-phase inverter for residential applications. This sleek inverter is equipped with the SnapINverter hinge mounting system, which allows for lightweight, secure, and convenient installation. The Primo inverters provide maximum safety, reliability, and highest energy yield even on complex roofs of shaded systems – giving customers the best return on their solar investment.
Size / category: 10.0 kW – 24.0 kW / Commercial
The Fronius Symo Advanced inverter line features six models ranging from 10 kW to 24 kW, ideal for commercial and industrial applications. The Symo Advanced is lightweight and combines high-power density with flexibility to ensure the fastest possible installation for your PV project. The small number of total power conversion electronics adds to the high serviceability from any mounting spot. You get total system granularity with only a low number of system components. Developed with 2 Multiple Power Point Trackers and Dynamic Peak Manager, our shade mitigation solution, the Fronius Symo Advanced ensures your PV system operates at maximum performance and efficiency.
UL 3741 listed? Yes, with use of Unirac, IronRidge, PanelClaw, Schletter and AeroCompact flat roof mounting systems
Key specs
What’s new? Generac’s flagship DC-coupled PWRcell Solar + Battery Storage System features a 7.6 kW inverter, industry leading storage capacity of up to 18 kWh in a single battery cabinet, plus whole-home backup capabilities with the PWRcell Automatic Transfer Switch and PWRmanager advanced load management device. Generac has continued to demonstrate our commitment to powering a smarter world and supporting the transition to cleaner energy solutions through the introduction of ecobee smart thermostats that can help save money on heating and cooling costs, as well as our more recent acquisition that introduced EV chargers to the Generac clean energy lineup.
The PWRcell Inverter was designed with the installer in mind. This bi-directional, REbus-powered inverter offers a simple, efficient design for integrating smart batteries with solar. Its ability to DC couple to solar and storage makes installation easy, allowing for plug-and-play operation. Solar + battery storage is simplified with this single hybrid inverter for grid-tied solar and whole home power. Ideal for backup power applications, as well as self-supply and zero-export energy cost management, PWRcell Inverters are among the most feature-rich in the industry and are backed by a 10-year limited warranty.
What’s new? GoodWe is a world-leading PV inverter manufacturer and smart energy solution provider. GoodWe’s comprehensive portfolio of products and solutions for residential, commercial, and utility-scale PV systems is guaranteed to deliver high performance and reliable quality across the board. With a proven track record and extensive experience in the solar industry, GoodWe has been deepening its expertise in the C&I energy sector to meet growing demand. GoodWe offers a compelling energy solution to accommodate the fast-growing C&I segment.
The GoodWe SMT-US Series inverter is ideal for medium and large-scale commercial installations. Harvest maximum solar energy and generate environmental-friendly power for an increased return on investment. Its unique fuse-free design makes it exceptionally easy to maintain for operators, saving time and money.
The SMT-US's 180V-980V wide operating voltage range allows the PV system to begin producing power earlier in the day, fully maximizing solar energy generation. With a max. 15A DC input current per string, the SMT-US Series is compatible with many high-power modules, giving integrators greater versatility in module selection and system design. Up to 6 MPPTs guarantee optimal energy production, even in areas with shading, delivering best-in-class ROI for commercial systems.
Key specs:
UL listings: PVRSS capability for NEC-2020, CSA, C22.2, UL1699B, UL1741, UL1741SB, IEEE1547 (with California,Hawaii). California CEC efficiency, California CSIP, ISO/IEC 17065, IEEE2030.5, EMC certification testing
The 5-9.6-kW, single-phase A-ES is one of the only hybrid inverter on the market with 4 MPPTs. With UPS-level switching, the inverter can switch to backup in less than 10 milliseconds in case of power outage. This ensures household appliances are not compromised.
us.goodwe.com | On-demand Webinar: GoodWe’s residential and C&I ESS Solutions
What’s new? Hoymiles has been recognized as the world’s NO.2 microinverter supplier in shipment terms in 2022 & 2023 (Source: S&P Global). The smart manufacturing base entered into operation in 2023 and the annual manufacturing capacity reached 5 million units by the end of the year. Last year, the company rolled out energy storage inverters in the US to help homeowners get ready for power outages and gain energy independence. In particular, the HYS-LV-USG1 hybrid inverter series are ideal solutions for setting up PV + storage systems from scratch; and the HAS-LV-USG1 AC-coupled inverter series are built for microinverter users so that they can add battery to their existing systems in a seamless way. The company is also set to launch a brand-new next-gen AC module solution this year, which is expected to move flexibility to the next level.
Hoymiles 1-in-1 microinverter, which can be connected to one panel and used in various applications, is one of the most flexible solar solutions. With a maximum DC voltage of 60 V, Hoymiles microinverter is a PV Rapid Shutdown Equipment and conforms with NEC-2017 and NEC-2020 Article 690.12 and CEC-2021 Sec 64-218. It is UL 1741 listed.
Hoymiles 2-in-1 microinverter can connect up to 2 panels at once and maximize the PV production of your installation. With a maximum DC voltage of 60 V, Hoymiles microinverter is a PV Rapid Shutdown Equipment and conforms with NEC-2017 and NEC-2020 Article 690.12 and CEC-2021 Sec 64-218. The model equipped with reactive power control and can meet the requirements of IEEE 1547, UL 1741 and CA Rule21.
Hoymiles 4-in-1 microinverter is one of the most cost-effective module-level solar solutions, as it can support up to 4 panels at once and maximize the PV production of your installation. With a maximum DC voltage of 60 volts, Hoymiles microinverter is a PV Rapid Shutdown Equipment and conforms with NEC-2017 and NEC-2020 Article 690.12 and CEC-2021 Sec 64-218. Both models listed are equipped with reactive power control and can meet the requirements of IEEE 1547, UL 1741 and CA Rule 21.
Hoymiles new microinverter HMS-500-1T series are suitable for high-powered solar panels, which rank among the highest for 1-in-1 microinverters. Each microinverter can be connected to one panel and used in various applications, making it one of the most flexible solar solutions. With a maximum DC voltage of 65 volts, Hoymiles microinverter is a PV Rapid Shutdown Equipment and conforms with NEC-2017, NEC-2020 Article 690.12, and CEC-2021 Sec 64-218.The new Sub-1G wireless solution enables more stable communication with Hoymiles gateway DTU.
Key specs:
UL listings: UL 1741, UL 1741 SB
Hoymiles new microinverter HMS-1000 series are suitable for high-powered solar panels, which rank among the highest for 2-in-1 microinverters. Each microinverter can connect up to 2 panels, with independent MPPT and monitoring maximizing the power production of your installation. With a maximum DC voltage of 65 volts, Hoymiles microinverter is a PV Rapid Shutdown Equipment and conforms with NEC-2017, NEC-2020 Article 690.12, and CEC-2021 Sec 64-218. The new Sub-1G wireless solution enables more stable communication with Hoymiles gateway DTU.
Key specs:
UL listings: UL 1741, UL 1741 SB
Hoymiles new microinverter HMS-2000 series are suitable for high-powered solar panels, which rank among the highest for 4-in-1 microinverters. Each microinverter can connect up to 4 panels, with independent MPPT and module-level monitoring maximizing the power production of your installation. With a maximum DC voltage of 65 volts, Hoymiles microinverter is a PV Rapid Shutdown Equipment and conforms with NEC-2017, NEC-2020 Article 690.12, and CEC-2021 Sec 64-218. The new Sub-1G wireless solution enables more stable communication with Hoymiles gateway DTU.
Key specs:
UL listings: UL 1741, UL 1741 SB
Hoymiles new generation three-phase microinverter HMT-2000-4T-208-NA series is designed to accommodate the high-powered PV modules, with maximum output power up to 2000 VA and maximum DC input current up to 16 A. The innovative 4-input design enables faster installation and lower cost, and makes the HMT-2000-4T-208-NA series a very cost-effective choices. The new Sub-1G wireless solution enables more stable communication with Hoymiles gateway DTU. Smart platform S-Miles Cloud makes it possible to module-level monitoring and remote O&M.
Key specs:
UL listings: UL 1741, UL 1741 SB
The HYS-LV-USG1 Series is a high-performance single-phase hybrid inverter with excellent reliability, including power classes ranging from 3.8 kW to 11.5 kW. It can support up to 10 inverters in parallel with a maximum power of 115 kW. The intelligent EMS function supports self-consumption mode, economic mode, and backup mode for multi-scenario applications. Monitoring management through S-Miles Cloud allows users to remotely diagnose and track individual system's performance over time, maximizing the total solar power production and battery utilization.
Key specs:
UL listings: UL 1741, UL 1741 CRD, UL 1741 SB
The HAS-LV-USG1 Series is for retrofit application, including power classes ranging from 3.8 kW to 11.5 kW. It can be installed with existing PV inverters, forming an AC-coupled system. The intelligent EMS function supports self-consumption mode, economic mode, and backup mode for multi-scenario applications. Monitoring management through S-Miles Cloud allows users to remotely diagnose and track individual system's performance over time, maximizing the total battery utilization.
Key specs:
UL listings: UL 1741, UL 1741 CRD, UL 1741 SB
As part of Hoymiles rapid shutdown solution for PV system, HRSD-1C/2C can be connected with one and two module respectively. It meets NEC 2017, NEC 2020, UL 1741 and SunSpec Rapid Shutdown requirements, guaranteeing PV system safety. When installed with and receiving a "permission to operate" signal from Hoymiles Transmitter, HRSD starts proper operation of PV system. In case of emergency, PV system would enter module-level rapid shutdown mode by simply disconnecting the AC power of Transmitter or using an external initiator.
Hoymiles gateway DTU-Pro is a data transfer unit which collects information and data of PV microinverter using 2.4G wireless solution (DTU-Pro-S uses Sub-1G wireless) and sends them to S-Miles Cloud, Hoymiles monitoring System, using different communication options such as Ethernet, Wi-Fi, GPRS or 4G. With DTU-Pro, users can easily read module-level data and alarms, realize remote operation and maintenance of PV system at any time, from anywhere on S-Miles Cloud. Pro maximum distance is 200m. Pro-S maximum distance is 400m.
Hoymiles website
What’s new? Morningstar’s SureSine is built on with premium toroidal low-frequency transformer for improved sinewave stability and superior power quality. True to Morningstar’s engineering principles, SureSine’s advanced thermal design eliminates cooling fans, increasing reliability and efficiency. SureSines offer full communications capabilities including USB, Ethernet, EIA-485, CANBUS, and Bluetooth for wireless communications and wireless Android and iOS mobile apps for set-up and monitoring using remote devices.
SureSines are the polar opposite of “me too” thinking, designed for the “mission-critical” industrial applications so important to Morningstar customers. Six models, from 150 to 2500 Watts in both North American 120V and International 230V versions. Models support combinations of 12/24/48V batteries. The range covers off-grid industrial systems in diverse applications such as rural development, telecommunications and wireless service providers, oil & gas, and more. They have superior thermal performance with fanless design for higher reliability– for example, the 300W model doesn’t derate until 45 C and delivers 200W at 60 C. System-level integration and communication with Morningstar charge controllers. Multiple AC hardwire remote terminal options on selected models. UL 1741 listed, and also IEC-62109-1, IEC 62109-2, and CE/UKCA compliant.
What’s new? Northern Electric Power (NEP) added NEPTUNE 3-phase inverters to go with its RSD solutions. In addition, NEP microinverters now have optional integrated WiFi hardware – the key benefit is to eliminate the need for a site gateway which reduces hardware and installation cost. Also, with the NEP Wi-Fi booster, the Wi-Fi inverters connect directly to the home Wi-Fi but independent of the consumer passwords which reduces truck roll and service burden related to consumer password/Wi-Fi changes.
NEP added NEPTUNE 3-phase inverters to go with its RSD solutions. These inverters include fully integrated transmitters and provision for NEP gateway to be installed inside the inverter wire-boxes. Just one gateway is needed to support numerous inverters (wifi, Ethernet and cellular internet connectivity). 5 models; 30kW-208Vac and 33,50,75,100kW-480Vac.
The BDM series involves nimble engineering, better service execution and easier positioning. Fill voids and gaps of content incumbents to generate customer focused value. A key attribute is its metal exterior, which avoids the more common failures associated with plastic module-level power electronics on hot roofs.
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NEP’s unique, two-way data communication Rapid Shutdown solution enables installer confidence that rapid shutdown is functioning correctly. This is valuable for safety assurance, code compliance, AHJ approval and characterization of the array performance upon commissioning. Further, NEP includes IV Curve trace ‘service mode’ to enable easier measurements at time of commissioning and through the life of the project. NEP’s optional data gateway is available for remote PV panel diagnostics and data performance.
NEP's Rapid Shutdown units are 20Amp models. The PVG-2 (dual PV) and PVG-3 (3 PV modules) are built with a metal enclosure. Why metal? The industry has seen numerous examples of RSD reliability issues with Non-NEP units. To reduce the risk of such, a metal enclosure improves heat dissipation and overall thermal management. Also, a metal enclosure is more robust, ‘fail-safe’ engineering investment to lower overall risk and improve the expected life-span of the devices. These same units are tested to 25Amp in Europe (CE marking). Lots of design margin with this improvement.
What’s new? SMA America, a leading provider of solar inverters and energy storage systems, continues to innovate in the renewable energy market. The latest offerings focus on enhancing efficiency and integration, meeting the evolving needs of consumers and installers alike. Advanced monitoring and control solutions enable real-time performance tracking and optimization, empowering users to maximize energy production and savings. SMA’s commitment to sustainability is evident in the emphasis on grid resilience and decentralized energy solutions, supporting a transition towards a more reliable and eco-friendly power infrastructure. With cutting-edge technology and a dedication to sustainability, SMA America remains at the forefront of the solar market.
Available now is the new ground-breaking Sunny Boy Smart Energy hybrid inverter, a 2-in-1 solution that enables both immediate energy use and storage in one single device. Backup Secure, previously known as Secure Power Supply, is back. Homeowners can choose to add Backup Secure to their system for access up to 1,900W of power with a secure outlet connected directly to the inverter. With its high-speed battery charging capabilities, easy installation, and handling, the Sunny Boy Smart Energy is a flexible solution that empowers homeowners to take control of their energy and modularly expand their system as their needs grow.
Key specs:
UL listings: UL certifications: UL 62109-1, UL 1741 SB/SA, UL 62109-1 CRD, UL 1699B, UL 1998, UL 9540
The Sunny Tripower CORE1 is the only inverter that offers an intelligent IV curve diagnostic, advanced string monitoring, and SMA Smart Connected. The world’s first free-standing PV inverter for commercial rooftops, carports, ground mount and repowering legacy solar projects, the Sunny Tripower CORE1 enables logistical, material, labor, and service cost reductions, and is the most versatile, cost-effective commercial solution available.
The Sunny Tripower X is the latest in commercial solar energy generation and the new centerpiece of the proven SMA Commercial Energy Solution. As a comprehensive solution, the integrated System Manager enables complete energy management from one platform while combining state-of-the-art technology into one device. This single-source design ensures small to medium-sized businesses can accommodate future energy management and needs.
UL listings: UL 62109-1, UL 1699B Ed. 1, CAN/CSA 22.2 No. 62109-1:16 / 62109-2:16, PV Rapid Shutdown System Equipment in accordance with UL1741:2021
The SMA Sunny Highpower PEAK3-US-21 lineup of 1500VDC inverters has been robustly built to last 25+ years and yield full nameplate output under intense operating conditions, such as high ambient temperatures and high DC:AC ratios. This makes the SHP PEAK3-US-21 inverter ideal for distributed generation ground mounts and large carports, Community Solar, Floating PV, Agri-voltaics projects and more. Notably, the SHP PEAK3-FLEX-US-21, with its adjustable AC voltage, power and current, is an excellent candidate to Repower failing inverters and breathe new life into older sites.
kW range:
(DC) Operating voltage range: 298-1500VDC, dependent on AC Voltage and Power class
No. of MPPTs / (Rated) MPPT voltage range:
Max / CEC efficiency: 99.0%
DC:AC Design Ratios: 200%+ and up to 3000 full load hours
Full power up to 52C (125F)
25-year extendable warranty
UL listings: UL1741SB, IEEE 1547:2018, UL 1741-SA - CA Rule 21, HECO Rule 14H, UL 62109, UL 1998, CAN/CSA-C22.2 No.62109
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Get more power out of your solar panels with Schneider Inverter’s integrated optimizers. With 4 independent channels, systems are efficient, easier to install, and support complex PV arrays with multiple orientations. For home battery systems, the Inverter pairs with the Boost battery. The compatible Pulse electrical panel can be used to intelligently control what appliances use the battery power during a grid outage. This can extend the battery runtime up to 80% while maintaining flexibility for the homeowner to choose what to power on the fly. The inverter’s 200% surge capability means higher reliability backup power by better handling the initial surge of electricity that many appliances require when starting. The solar and battery systems can operate with dc or ac-coupled solar, and are compatible with generators for extended backup. Schneider’s 200 Amp rated Backup Controller is available in multiple configurations for easier installations and fewer boxes on the wall. Schneider Inverter will be available in H2 2023.
The XW Pro leads Schneider Electric Solar’s hybrid inverter range, as it provides installers with the flexibility to design and install a complete solar and storage system. The XW Pro offers a high overload power rating of 1.75x with the ability to stack up to 4 inverter units to increase overall power output. Because of its scalable and adaptable infrastructure, the XW Pro can also be integrated with lithium-ion batteries for solar and storage, or backup power systems without solar. Schneider Electric’s solar hybrid inverters come with a complete ecosystem of accessories to enable efficient installation. This includes integration with MPPT charge controllers and Insight Energy Management, Schneider Electric’s energy management software that allows solar professionals to remotely manage multiple installation sites with ease.
What’s new? Sol-Ark introduced the L3 LimitLess Lithium battery energy storage system (BESS) to offer scalability, reliability, and energy resilience for C&I operations. The L3 Series is an ideal solution for various settings, from large shopping centers and busy manufacturing plants to critical data centers and electric vehicle charging stations. It helps reduce a business’s energy bills by managing peak energy usage and allows for the generation of additional revenue streams by selling excess energy back to the grid. Moreover, the Sol-Ark L3 LimitLess Lithium has a built-in aerosol fire suppression system in both the module and cabinet for enhanced safety. Its modular design can expand from 400 kWh to 9.6 MWh.
Sol-Ark’s 15K-2P (UL# Limitless 15K-LV) is so powerful that it eliminates standby generators, a 200A whole home transfer switch (built in), UPS’s for electronics due to 5ms switching, Neutral Forming Transformer due to split phase output, and parallel stacking because only one is needed. Sol-Ark also sells smaller units (12K-2P, 8K-2P, 5K-1P) for critical loads, off grid, and mobile applications. Features and benefits include parallel stacking, grid sell, meter zero, time of use, smart load, generators, simultaneous AC & DC Coupling, & peak shaving. The company has partnered with many battery companies like HomeGrid, Endure, SimpliPhi, Fortress, Blue Ion, Storz Power, PowerSync, and Discover to advance inverter and battery control through extensive communications.
The Sol-Ark Whole Home hybrid inverter is a powerful and versatile home energy storage solution on the market. The 15K-2P hybrid solar inverter is a complete whole home backup, supporting essential appliances like your lights, internet, and refrigerator, as well as large appliances like your air conditioner when your home has lost electricity. It can also power and charge your electric vehicles or generators and help reduce your monthly electricity bills.
The 15K-2P is capable of a full 15kW of AC output to power homes, and with a built-in 200A grid pass through, the Sol-Ark Whole Home has a faster, cleaner system installation because it doesn’t need additional gateways between the grid and your home’s service panel. It’s NEM 3.0 ready, with built-in TOU functionality, this inverter provides you with high power reliability for solar energy management, enhancing your home’s energy independence and resilience.
Key specs:
Sol-Ark introduced a line of three-phase hybrid inverters in light commercial 30K-3P-120/208V and industrial 60K-3P-277/480V. Both support 4 MPPTs for dc coupling, ac coupling, generators, UPS grade 200A 5ms auto transfer switch between grid/off-grid/generator, 12 parallel stacking, two independent high voltage batteries, and U.S.-based remote monitoring/control. Previously, 208V ESS applications had to use 480V inverters and massive transformers, wasting power and install time. Most previous C&I hybrids were for on-grid peak shaving or meter zeroing and lacked built-in transfer switches for grid forming. Sol-Ark 30K & 60K is an all-in-one, easy-to-install hybrid inverter for the C&I market.
What’s new? The SolarEdge TerraMax Inverter and SolarEdge H1300 Power Optimizer. Check it out below.
The new SolarEdge TerraMax 330kW Inverter is designed to maximize energy production for any project terrain and for overcoming challenges posed by shading and uneven terrain on community solar ground mount sites. In addition, it is the ideal product for agri-PV, small-medium utility-scale projects and floating PV. It delivers more energy with 200% DC oversizing for up to 50% less Balance of System (BoS) costs (Based on comparisons using HelioScope on 8MW projects and typical string inverters. Numbers can change based on project characteristics).
In terms of power, this inverter helps ensure continual peak performance with an integrated PID (Potential Induced Degradation) rectifier and boosts energy yield through DC-optimized technology with multiple MPPTs.
To save on BoS costs, the inverter works with fewer and longer strings on up to 80 modules, and further streamlines by providing higher power through fewer units. The SolarEdge TerraMax inverter also speeds up onsite work with a topology feature that places the inverter in a central location alongside distributed, multiple MPPTs in the array. These factors can reduce labor, installation time and material cost with virtual central topology and single DC input architecture.
Finally, the TerraMax Inverter also simplifies operations & maintenance, reducing unnecessary truck rolls with granular, module-level monitoring, and reducing schedule risks and maximizing system uptime with automatic alerts and remote troubleshooting capabilities.
Key specs:
UL listings: UL 1741, UL 1998, UL 1741SA, UL 1741SB
Supporting high power 650W modules, SolarEdge H1300 Power Optimizers enable modules in the array to work independently. The underperformance of one module will not affect others in the string, eliminating mismatch-related power losses due to shading, soiling, or aging, enabling higher overall energy production.
The H1300 also helps to harvest more energy from bifacial modules by mitigating electrical losses caused by the varying ground albedo, shading, obstructions, or other rear-side factors. Further, inter-row shading losses are minimized with module level MPPT. Plus, up to 80-module string length is supported, resulting in fewer strings and enabling up to 50% BoS savings when compared to traditional string solutions.
Additionally, the H1300 helps keep production rolling with granular and continuous module-level data monitoring for EPCs and O&M personnel. It tracks system performance and helps to pinpoint & resolve issues remote or onsite using our Monitoring Platform.
The SolarEdge Home Hub inverter’s industry leading 99% weighted efficiency paired with its ability to DC oversize up to 200% allows installers to install more power, increase system ROI, and better meet the increasing energy needs of their customers. Additionally, the DC-coupled Home battery offers installers the ability to install the inverter, battery, and EV charger on a single breaker which enables faster installation both at the time of install, as well as with future additions, with fewer main panel upgrades. DC coupling allows for inverter, battery, and EV charger to be installed on one breaker, resulting in fewer main panel upgrades, and lower installation costs. All of this paired with a standard warranty of 12 years extendable to 25 years, integrated arc fault protection, and in app features such as Weather Guard, enables installers to offer their customers increased peace of mind and reliability.
Reaching up to 120kW, SolarEdge’s Three-Phase Inverters with Synergy Technology are designed to provide more power and higher profitability in large-scale PV installations. Maximizing energy production with up to 175% DC oversizing, it offers improved uptime through modularity and independently working units. A pre-commissioning feature allows installers to validate system components before connecting to the grid and the built-in night-time PID rectifier helps to avoid module performance degradation. Advanced safety is offered through SolarEdge’s arc fault protection and rapid shutdown, built-in thermal sensors on the DC and AC terminal blocks, and field-replaceable surge protection devices. Pre-commissioning designed to resolve system issues before grid connection via SetApp and a USB power bank. Monitored and field-replaceable type 2 surge protection devices (SPDs). The Synergy inverter is installed in tandem with the Power Optimizer (S1200/S1201) yielding savings on eBOS and allowing for greater energy production over plant life.
Three Phase Inverter w/ Synergy Technology Power Ratings:
Three Phase Inverter Power Ratings:
The S-Series Power optimizers feature advanced safety features such as SolarEdge Sense Connect, an industry-first technology that detects temperature increase at the connector level, stopping power flow before an arc can occur. The SolarEdge Sense Connect technology joins an expanded range of pro-active safety features, such as built-in SafeDC, and rapid shutdown. Providing 99.5% efficiency and supporting two high power, high input current PV modules, the S-Series helps lower Levelized Cost of Energy thanks to higher yield and enables longer and more powerful strings.
Commercial S-Series Power Optimizers:
Residential S-Series Power Optimizers
What’s new? Tigo can now support generators up to 24 kW when paired with Tigo 200A GO ATS (Automatic Transfer Switch). Also, integration into EI Professional, Tigo’s multi-site management platform that reduces truck rolls for installers and O&M providers
Our Tigo EI Residential Hybrid Inverter can work as a standalone photovoltaic inverter today and when you’re ready for storage, easily add our EI Battery. When paired with Tigo’s Optimizers, our patented PIV enables more output per given area and modules to be placed in areas with shade. PVRSS certified for Rapid shutdown with Tigo’s TS4-A-O and TS4-A-F/-2F MLPE, right out of the box. With 50V startup, the inverter can wake up early and shutdown later. This means our system is able to maximize more energy production through the day. It is UL 1741 listed.
Our most popular series include:
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Solar energy doesn’t provide electricity in a format that your table lamp could be powered by. Inverters change the power produced by your solar panels into something you can actually use.
Think of it as a currency exchange for your power. You might have a fistful of yen, but until you stop and exchange it for USD, you can’t pay for lunch stateside.
Your home is wired to conduct alternating current (AC) power. The electricity produced by solar panels is initially a direct current (DC). Inverters change the raw DC power into AC power so your lamp can use it to light up the room.
Inverters are incredibly important pieces of equipment in a rooftop solar system. There are three options available: string inverters, microinverters, and power optimizers.
Team up with an Energy Advisor to see which inverter is best for your solar project
String inverters have one centralized inverter — or, keeping with the metaphor — one central currency exchange station.
This is a standard inverter, and it works just fine if you don’t have any encroaching shade from nearby trees or a big chimney. It’s also great if you have all of your solar panels facing the same direction.
String inverters are standard in the industry, and they’re the least expensive.
Microinverters are small units built into each individual solar panel that convert power. Think of it as having mini currency exchange stations on every nearby street corner.
This gives each panel the ability to function at peak performance, independent from its neighbors. Even if the panel next to it has a tree branch shading it for most of the day, all the other panels can convert at full capacity. Any drop in efficiency only affects one panel.
Microinverters also enable you to monitor the performance of each individual panel. This is helpful for spotting any issues with a single panel so you can have it repaired before it slows down the whole system’s productivity.
This type of inverter can be more expensive than string inverters, but it can pay off over time by getting more power from your system overall.
Microinverters also make it easy to increase power usage if you want to. Say you buy an electric car and you’ll need more power to charge it every night. Adding more solar panels and inverters is easier and less expensive than adding an additional central inverter for a string inverter system.
Read more about string inverters vs microinverters here.
Power optimizers are somewhere in between string inverters and micro-inverters both in how they function and in price.
As with micro-inverters, power optimizers have a component (the “optimizer”) underneath and within each solar panel. But rather than change the DC to AC right there on site, these inverters optimize the current before sending it to one central inverter.
This is more efficient than a string inverter, as any sluggish production from one panel doesn’t slow the whole system, but more cost-efficient than a standard micro-inverter setup.
Imagine being able to cut to the front of the line at the currency exchange office. It’s not quite as quick or convenient as having your own exchange office a few steps from your home, but there’s no waiting around once you get to the central office.
Micro-inverters and power optimizers are gaining popularity and prices are dropping as the technology advances.
We have more details on power optimizers in this post.
Ultimately, best inverter for you depends on your roof shape and size, nearby trees, how much energy you need, and your budget.
To recap, there are three kinds of inverters: string inverters, microinverters, and power optimizers.
They all transform the power your solar panels generate from direct current (DC) to alternating current (AC). This makes the energy usable for your home.
Here’s a few things to look for when shopping for inverters…
Most people feel more comfortable purchasing electronic devices with warranties. Solar inverters are no exception. Most inverters have warranties ranging from anywhere between 5 and 10 years, though some can be extended to 25 years.
When you’re looking at a company, make sure you know what’s included in the warranty and what’s not. For example, some power optimizers might not include the central inverter under the warranty.
Also make sure you understand the terms of a warranty. Is the device covered in case of an internal glitch as well as in the case of external damage? Will you be charged for labor or shipping if you have to send parts in? These are all important questions to ask.
As with most electronic equipment, inverters operate best when they’re running cool. Operating temperature is the safest temperature range an inverter maintains.
Inverters will naturally generate some heat themselves as they do their job. Since they’re typically in an uncontrollable environment outdoors, they’re exposed to a wide range of temperature fluctuations.
Obviously, conditions aren’t always ideal and some times an inverter will have to work harder than others. The higher the operating temperature (the more heat it can handle), the better.
There are two numbers to look for in solar inverter efficiency: peak efficiency and weighted efficiency.
Peak efficiency will give you the efficiency of your inverter when it’s running optimally. It’s good to know what the best-case scenario is, but it’s also worth noting that it won’t always be hitting that level. Some days it might only reach peak efficiency for an hour or two, or maybe not at all.
Weighted efficiency figures in the variables like DC input levels. This gives a more accurate gauge as sunshine, temperature, and other environmental elements affect inverter efficiency throughout the day.
This is the term used to describe the energy output that is lost due to undersizing an inverter.
Any given inverter has a maximum power rating (at the residential level, measured in W or kW). When solar supplies DC power in excess of that inverter’s maximum power rating (what the inverter can handle), the resulting power is “clipped.” Think of it like a 14 foot tall truck trying to go under a 13 foot bridge — a little comes off the top.
It’s important to consider the solar panel arrays’ maximum power output and select an inverter with the correct size, model, and type in order to avoid excessive clipping.
It’s normal for the DC system size to be about 1.2x greater than the inverter system’s max AC power rating. For example, a 12 kW solar PV array paired with a 10 kW inverter is said to have a DC:AC ratio — or “Inverter Load Ratio” — of 1.2.
When you into account real-world, site-specific conditions that affect power output, it may make sense to size the solar array a bit larger than the inverter’s max power rating, as there may be very few “power-limiting days,” or instances of clipping for that system.
Inverter efficiency is a percentage that tells us how much DC power input to an inverter comes out as usable AC power.
No inverter is 100% efficient, although some come close in favorable conditions. In the conversion from DC to AC, power is lost in the form of heat.
While inverter efficiency is an important factor to consider in the selection process, there are other factors to consider that also affect a project’s economics, such as warranty, price, expected life, serviceability, and monitoring functions.
Maximum power is the highest amount of power allowed to feed into an inverter, which is a function of the inverter’s specifications or the maximum power a solar panel can produce. This will occur at the optimal trade-off between voltage and current along a given panel’s I-V (current and voltage) curve.
A solar system’s maximum power output will vary with conditions, such as how much sunlight it receives, temperature, and other factors. A fixed-tilt, stationary, roof or ground-mounted solar PV system might only produce its maximum rated power during a limited period of the day. Every specific solar cell has its own unique I-V curve, which relates its maximum power output to variations in current (I) and voltage (V).
A device that periodically tracks characteristics of a given panel, string of panels, or system, and optimizes and varies voltage and amperage accordingly in order to produce maximum power.
A device that converts direct current (DC) produced by a single solar panel into alternating current (AC).
Micro-inverters are commonly connected to and installed at the site of, or behind, each individual solar panel in an array. Most micro-inverter makes are installed in the field, while some come panel-integrated by the manufacturer.
Popular brands of micro-inverters include: Enphase, Chilicon, APS, ABB, SMA, and SunPower.
A DC-DC converter, optimizer, or “panel optimizer,” is a module-level power electronic device that increases the solar system’s energy output by constantly measuring the MPPT of each individual panel.
The panel optimizers relay performance characteristics via a monitoring system to facilitate operations and any necessary maintenance. In essence, optimizers support flexible system designs and arrangements – with multiple panel orientations, tilts, azimuths, and module types in a given string.
Because optimizers are a DC-DC, or DC-coupled, systems using this technology will generally be compatible with DC-coupled energy storage or battery backup solutions, like the Tesla Powerwall.
Perhaps the most advantageous benefit of using a DC optimizer is panel-level MPPT, or max-power point tracking. The result is increased energy harvest from a panel system, especially when subject to periodic or sweeping shade.
Another term for Maximum Power Point (MPP).
The device that converts direct current (DC) electricity produced by groups of solar panels (called strings), into usable alternating current (AC) electricity.
String inverters are considered a “mature” solar technology that has proved effective, safe, and reliable. Residential, 240V AC string inverters usually carry manufacturer’s warranties of about 10 years.
When installed to a manufacturer’s specifications, code, and best practices, a string inverter may require service or ultimately replacement during a photovoltaic system’s lifespan.
Team up with a solar.com Energy Advisor to understand what is covered by your solar system’s workmanship warranty, as well as the inverter manufacturer’s warranty. Depending on what one’s goals, budget, and preferences are, string inverters can be a great option for your solar PV system.
Are you interested in learning more about 3 phase power inverter? Contact us today to secure an expert consultation!