Power & Electricity News

German Startup Wins EU Grant for a Home Battery That Skips the Solar Panel

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Revolta AG, a Frankfurt-based battery startup, has been awarded funding from the European Regional Development Fund, administered through Germany’s state of Hesse, to develop a plug-and-play sodium-ion home battery designed to be charged directly from the grid rather than from rooftop solar panels, the company said this week.

A small grant for an underserved segment

The project carries eligible costs of €660,545 (about $743,530), with the EU covering 40% of that through the ERDF co-financing mechanism — roughly €264,200 — over a period running from August 1, 2026 to December 31, 2029. The battery is aimed squarely at a segment the home storage market has largely passed over: renters and owners of smaller apartments who have no photovoltaic system of their own and therefore nothing to pair a conventional solar battery with. Revolta’s design instead connects straight to the household’s AC supply, charging when wholesale power prices and grid fees are low and discharging back into the home, or potentially the grid, when prices rise.

Why sodium instead of lithium

The battery uses sodium-ion cells rather than the lithium iron phosphate chemistry common in home storage, meaning the product needs neither lithium nor cobalt. Sodium-ion cells are generally cheaper to produce and rely on more widely available raw materials, though they typically store less energy for a given size than lithium-ion equivalents — a trade-off that matters less for a grid-charging product than it would for a system paired with variable solar output. Revolta launched a separate high-voltage sodium-ion battery aimed at households that do have their own solar panels in July. The grid-charging AC version now in development is a distinct product built for the no-PV case.

One of several funding lines for a young company

The ERDF award is not Revolta’s only public funding. The company separately holds a €124,940 grant from Germany’s Federal Environmental Foundation (DBU) for an AC battery project running from September 2025 to September 2027. The dual support reflects a wider push inside Germany’s storage market to extend battery economics to households that cannot install solar, as regulators have separately moved to open up market rules allowing batteries to draw on both solar and grid electricity. For now, Revolta’s grid-charging battery remains in development rather than on the market, with the funded project running through the end of 2029.