From ESS News
Amsterdam-based Moonwatt has developed a new type of battery storage system based on sodium-ion NFPP chemistry, purpose-built for seamless solar hybridization. The system integrates battery enclosures with hybrid string inverters, enabling efficient DC-coupled solar-plus-storage integration.
The company gained attention in March 2025 when it raised $8.3 million in seed funding to accelerate growth. Moonwatt operates as an energy storage system integrator, designing, developing, and supplying string battery enclosures, hybrid string inverters, and battery management and site control systems, while sourcing sodium-ion cells globally.
“Initially, we’re sourcing them from Asia, but we aim to add American and European cell sourcing options as soon as they become available and create value for our customers,” Valentin Rota, co-founder and CCO of Moonwatt, said in an earlier interview with ESS News.
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While b I appreciate lithium and sodium they are better suited for mobility and distribution applications not high voltage transmission operations