Rosatom Subsidiary Unveils First Russian String Inverter Prototype for Solar Power Plants
Parus Electro LLC, a subsidiary of Russia’s state nuclear corporation Rosatom, has developed a prototype of the country’s first domestically produced string inverter, marking a significant milestone in Russia’s renewable energy and power electronics sector.
A string inverter is a critical component of solar power plants, converting the direct current (DC) generated by solar panels into alternating current (AC) suitable for safe and efficient transmission through power grids. According to Parus Electro, the new prototype enhances energy generation stability during winter and cloudy conditions, while also increasing the total number of power generation hours throughout the day.
Designed for operation in extreme environments, the inverter can function reliably across a wide temperature range from –50°C to +65°C. It is capable of maintaining stable voltage levels even in remote and weak-grid areas, making it suitable for diverse geographical and climatic conditions.
The inverter is designed for both large-scale, ground-mounted industrial solar power plants and smaller rooftop installations. It supports adaptive reactive power management tailored to the requirements of specific grid operators and can be integrated with energy storage systems. The device operates in both grid-connected and hybrid modes, allowing flexible deployment alongside battery storage.
One of the key innovations of the new inverter lies in its modular architecture. The design allows individual power supply modules to be replaced without dismantling the entire system. This significantly reduces maintenance and repair times—from dozens of hours to just a few minutes—thereby lowering downtime and minimizing energy generation losses.
Parus Electro reports that the inverter achieves an efficiency of 98.3 percent, placing it among high-performance solutions in its class. More than 90 percent of the components used in the device are of Russian origin, and the company plans to deploy full-scale production at its own manufacturing facilities. Serial production is expected to begin in 2026.
The development reflects Rosatom’s broader push into advanced energy technologies and international infrastructure projects. In recent developments, a reactor vessel manufactured by Rosatom has been installed at Unit 1 of the El-Dabaa Nuclear Power Plant in Egypt.
In Africa, preparatory work is underway for the construction of a 200-megawatt solar power plant in Mali with Rosatom’s support. Additionally, the first of four Russian test stands has arrived at the construction site of the International Thermonuclear Experimental Reactor (ITER) in southern France.
With the new string inverter prototype, Parus Electro and Rosatom aim to strengthen Russia’s technological sovereignty in renewable energy while offering innovative, competitive solutions to international markets.