Green Hydrogen Production from Rainwater: INP Nordenham’s Solar-Driven PEM Demo Joins National WENde Project

Most hydrogen demonstrations rely on big wind farms and grid hookups, but the folks at the Innovationszentrum für Nachhaltigkeit und Produktionstechnologie (INP) in Nordenham-Einswarden are shaking things up a bit. They’ve come up with a super cool, compact solar-powered electrolyser that’s actually powered by rainwater they’ve collected. This system not only produces hydrogen but also methanol, showcasing a full cycle of green hydrogen and methanol production without needing drinking water or large wind farms. Plus, it’s just joined the federal WENde research network, which is pretty exciting!

Integrated Solar-to-Hydrogen Module

This demonstration runs on two photovoltaic plants that pack about 120 kWp each, paired up with battery buffers and a proton exchange membrane electrolyser. They’ve made sure that solar DC power flows right into the electrolysis stack using DC-DC converters for top-notch conversion efficiency. The rainwater they collect is filtered and sent through a reverse osmosis unit so it meets the purity levels needed for those PEM membranes. The electrolyser is pretty nifty too; it can ramp up or down in seconds, aligning with the current trends in renewable energy setups, and it operates completely off-grid, meaning it doesn't touch the public electricity grid or even use potable water.

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