Top 10 String Inverter Companies Powering Solar Energy Efficiency

If solar panels are the public face of the renewable energy revolution, string inverters are the silent brains behind the scenes that convert sunlight into usable, optimum power. String inverters, which are frequently disregarded in popular discourse, are currently gaining attention as solar adoption picks up speed globally. They now play a strategic role rather than a functional one.

Conversion to Optimization

Fundamentally, a string inverter transforms solar generated direct current (DC) into alternating current (AC), which is utilized in homes and commercial properties. However, modern string inverters are capable of much more than just conversion. They monitor output, control performance, and are becoming more and more integrated with smart energy systems. String inverters run over several panel “strings” providing flexibility, simpler maintenance, and better fault isolation than central inverters, which manage large-scale systems. As a result, they are especially appealing for solar installations in homes and commercial spaces, which are experiencing rapid expansion.

Fortune Business Insights estimates the market for string inverter to grow from USD 7.98 billion in 2025 to USD 25.76 billion by 2034, with a significant CAGR of 17.07% over the forecast period.

Fortune Business Insights Discloses its Top 10 String Inverter Companies

1. Huawei Technologies Co, Ltd

Ren Zhengfei established Huawei Technologies Co., Ltd in 1987, with its headquarters located in Shenzhen, China. Fusion Solar is a smart PV brand owned by the Huawei Digital Power. From 2015 to 2018, Huawei was the world’s top shipper of inverters and continues to be the industry leader in string inverters. Key products include Utility, C&I, and residential string inverters from the SUN2000 series. AI BOOST algorithms, 9+ MPPTs, and 98.8%+ EU efficiency are used by SUN2000-185KTL and 330KTL models. In December 2025, Huawei introduced the Huawei FusionSolar 9.0 platform which offers intelligent string inverters and intelligent energy management with control systems to support the grid.

2. Sungrow Power Supply Co., Ltd.

Sungrow Power Supply Co., Ltd. was established in 1997 with its headquarters located in China. PV inverters, energy storage, EV chargers, and green hydrogen are the main components it deals in. SG series, ranging from 2.5kW to 352kW is its key product in the industry. At the 2025 Re+ Conference in Las Vegas in September 2025, the firm showcased a variety of cutting-edge products designed to meet the demands of the North American solar market. These included a full range of energy storage items and a novel modular inverter that combines the best features of both central and string inverters.

3. Cabot Corporation

Founded in 1882, Cabot Corporation is a publicly traded company with its headquarters located in Boston, Massachusetts. It is a chemicals and performance materials enterprise that specializes in aerogel, carbon black, fumed metal oxides, battery components, and inkjet colorants. It provides conductive carbons, thermal fillers, and coatings to Huawei, SMA, and SolarEdge units to control heat, electromagnetic interference, and longevity. The new LITX 95F conductive carbon was introduced by Cabot Corporation in July 2025. This novel material was created for use in Energy Storage Systems (ESS) lithium-ion batteries. For renewable energy applications including solar + storage systems, which depend on string inverters for effective operation.

4. BASF SE

BASF SE is based in Ludwigshafen, Germany, and was established in 1865. It has its expertise in crop technology, materials, coatings, and chemicals. String inverters are not sold by BASF. Thermal management is a crucial issue as string inverters get more powerful and compact. BASF provides materials that aid in component protection and heat dissipation. Heat-stable polymers, potting compounds, and EMI materials that are required for every 1500V Huawei SUN2000 or Sic Fraunhofer inverter are all developed by BASF.

5. Trelleborg AB

Founded in 1905, Trelleborg AB is based in Sweden. This multinational polymer engineering company specializes in engineered coated textiles, hoses, seals, and antivibration. The firm does not manufacture string inverters, it keeps them safe. To withstand 25 years of heat, rain, and vibration, every string inverter on a rooftop or in a field depends on seals, dampers, and gaskets. Those polymer components are engineered by the firm.

6. Fronius

Founded in 1945 by Gunter Fronius, Fronius International GmbH is based in Pettenbach, Austria. It is a family-run business and has its expertise in photovoltaics, battery charging, and welding technology. The first string inverter for MW-scale installations was introduced by the firm in 2015. In November 2025, the firm introduced GEN24, which is completely compatible with MidNite Solar’s Rosie battery inverter and has finished testing. When the two items are combined, homeowners can employ string inverters for more efficient self-consumption and vital backup power.

7. GoodWe

Founded in 2010, GoodWe Technologies Co., Ltd. is based in Suzhou, China. PV inverters, batteries, EV chargers, BMS, and heat pumps make up the core. As a part of its SDT series, GoodWe unveiled a 50kW Commercial & Industrial (C&I) string inverter intended for small to medium-sized C&I solar projects. This inverter highlights GoodWe’s emphasis on high-performance string inverter solutions for distributed solar markets by providing silent operation at full load, supporting up to 180% PV oversizing, and offering numerous MPTs to maximize energy harvest in complex rooftop deployments.

8. SMA Solar Technology

SMA Solar Technology is based in Niestetal, Germany, and was established in 1981. It is a pioneer in PV inverters. It specializes in energy management, monitoring, solar and battery inverters, and EV charging. Sunny Tripower CORE1, the first free standing 50kW string inverter in the world was developed by this firm. In September 2025, a memorandum of understanding between SMA Solar Technology AG and Create Energy stipulated that SMA will produce its Sunny Highpower PEAK3 string inverters in Create Energy’s Portland, Tennessee, facility.

9. Delta Electronics

Delta Electronics was established in 1971, with headquarters located in Taipei, Taiwan. It is among the biggest manufacturers of power supplies with its expertise in power electronics, automation, temperature control, EV charging, and renewable energy. Delta used more than 50 years of power supply DNA to go from 3kW domestic to 350kW utility string. At RE+ 2025, Delta displayed its next-generation 350kW string inverter, which is intended to perform better in large-scale utility projects than conventional central inverters.

10. IngeteamA.

Founded in 1972, Ingeteam S.A. has its headquarters in Zamudio, Spain. Power converters, generators, motors, automation, O&M for wind, PV, storage, marine, and rail comprise the core. With a focus on MW plants with decentralized architecture, the firm brought utility-scale expertise from wind converters to 1500V string inverters.

Why String Inverters Will Remain Central to Solar Growth

In conclusion, the market for string inverters is situated at the nexus of global environmental objectives, efficiency, and innovation. Reliable and intelligent power conversion technologies are becoming more and more important as solar energy continues to grow at a rapid pace. As straightforward conversion devices, string inverters are increasingly developing into intelligent energy managers that support the shift to decentralized power systems, optimize performance, and enable system flexibility. In the future of energy, smart power management will be equally as important as producing power.