By 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 integration of solar and storage.
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 systems integrator, designing, developing and supplying string battery enclosures, hybrid string inverters and battery management and site control systems, while sourcing sodium ion cells worldwide.
“We will initially source them from Asia, but we aim to add US and European mobile sourcing options as they become available and create value for our customers,” said Valentin Rota, co-founder and CCO of Moonwatt, in a previous interview with ESS news.
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