Sodium-ion batteries are gaining attention as a promising alternative to Lithium-ion technology. Amsterdam-based start-up Moonwatt has developed an innovative Sodium-ion Battery system tailored for seamless integration with solar power plants. Designed with efficiency and scalability in mind, the company’s solution combines battery enclosures with hybrid string inverters for a fully DC-coupled solar-plus-storage setup.
Moonwatt has engineered its sodium-ion technology using NFPP chemistry, which focuses on high efficiency and safety. Unlike traditional large, centralized battery systems, Moonwatt’s modular architecture allows batteries to be distributed across the solar plant. This decentralized design optimizes land use and enables installation in various locations, including directly beneath solar panels. The lightweight system makes deployment quick and straightforward, requiring only a standard forklift and no need for complex foundations.
The company’s approach is also cost-effective. By eliminating the need for additional MV transformers, the modular setup reduces electrical balance-of-plant expenses. Moonwatt’s DC-coupled infrastructure avoids unnecessary AC/DC conversion losses, boosting overall efficiency. This design enables solar energy that would otherwise be clipped during peak generation to charge the batteries, maximizing asset utilization and enhancing revenue streams. Customers can sell more kilowatt-hours to the grid while lowering PV curtailment.
Another significant innovation from Moonwatt is its passive cooling system. This thermal management design operates without moving parts, ensuring silent and maintenance-free operations. It also enhances durability in harsh outdoor conditions, protecting systems against dust, water, and air ingress. The system can operate reliably in extreme temperatures without substantial degradation, greatly improving the longevity and resilience of the energy storage solution.
Moonwatt’s journey includes noteworthy milestones. In March 2025, the company secured $8.3 million in seed funding to accelerate its growth and expand Sodium-ion Battery applications. Additionally, Moonwatt earned a €1.15 million DEI+ grant from the Dutch Business Agency, which underscores the innovation and potential impact of its technology. These achievements highlight the company’s dedication to driving advancements in the renewable energy landscape.
The start-up plans to launch its first project in 2026 at Cleantech Park Arnhem in the Netherlands. This deployment will be a collaboration with IPKW and Veolia. It marks a significant step for Moonwatt as it sets the foundation for broader adoption across solar-plus-storage projects globally. The scalability of its solution makes it suited for both small-scale projects and large gigawatt-level installations, offering flexibility for various applications.
With sodium-ion technology, Moonwatt has introduced a product that challenges traditional battery systems. According to Guillaume Mancini, the company’s CTO, “This approach helps further reduce the cost of firm solar power by combining safety, efficiency, and innovation in design.” This innovative solution promises to drive the next era of cost-effective and sustainable solar energy storage systems, reinforcing Moonwatt’s position as a market pioneer.
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