Moonwatt

Moonwatt, a European energy storage startup headquartered in Amsterdam, pioneers next-generation sodium-ion battery technology. Its modular systems integrate with utility-scale solar installations, boosting efficiency and grid reliability.

Company Location

Country:

Netherlands

City:

Amsterdam

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Company Overview

Moonwatt is a European energy storage startup headquartered in Amsterdam, Netherlands, founded in 2024 by CEO Zukui Hu, CTO Guillaume Mancini, and CCO Valentin Rota. The company’s mission is to advance next-generation sodium-ion battery technology to resolve solar intermittency challenges and accelerate the transition to a decarbonized power grid.

Battery Technology

Moonwatt’s core technology is sodium-ion batteries with modular, decentralized architecture and low-voltage DC coupling, overcoming lithium-ion drawbacks. The chemistry uses abundant, low-cost sodium, reducing supply chain risks and costs by up to one-third. Integrated systems include modular battery enclosures, string hybrid inverters, and advanced BMS to optimize energy capture, raising solar plant capacity factors from 15–20% to 80% and enabling scalability from hundreds of kilowatts to gigawatt-scale.

Products

Integrated hardware and software solutions comprising modular battery enclosures, solar-tailored string hybrid inverters, and advanced battery management systems. Features include low-voltage DC coupling to minimize conversion losses, scalable deployments from hundreds of kilowatts to gigawatt-scale, and optimization of solar plant capacity factors up to 80%, enabling round-the-clock renewable energy supply.

Recent Projects

Pilot installations co-located with utility-scale solar plants in Europe slated for 2026 to validate technology ahead of commercial rollouts planned for 2027, targeting utility-scale solar plants and commercial sites to enhance energy resilience and reduce intermittency barriers.

Investors

In 2024, Moonwatt raised an €8M seed round from daphni, LEA Partners, AFI Ventures, Founders Future, Kima Ventures, and strategic business angels and prospective customers.

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