Solar energy, 24 hours, year-round. on or off-grid.
The hydrogen-based Solenco Powerbox allows solar or wind power to be privately stored for hours or months, allowing 24 hour, year-round renewable electric power and heat, independent of the power grid. Powerbox allows every home and business to cheaply store their own generated energy, with over 90% conversion efficiency, electric and heat storage. 
The Solenco Powerbox is a heavily-patented combination of an electrolyzer and a fuel cell in one unit. It transforms electricity into hydrogen, stores it indefinitely, then converts hydrogen back into electricity and/or heat, at minimal loss. Heat comes out as hot water at a rated temperature of 80°C. 
Unlike battery storage, the Powerbox stores heat as well as electricity. There is no degradation of conversion capacity over time – its working lifetime is over 30 years. Unlike natural gas storage, there is no need to draw on local underground storage capacity. Unlike hydroelectric power storage, there is no need for local mountains or lakes to be available. Unlike chemical storage, there is no hazardous storage, transport or disposal concern. 
Our method has zero carbon footprint and works anywhere, allowing homes and businesses to be heated and powered with intermittent solar and/or wind storage and even to feed excess power into local city grids as needed.
Solenco will be powerful to commercialize, since it has comparable cost to existing inferior solutions, and has the fastest return on investment (<3 years) of any storage solution on the market. Powerbox is targeted at the EU-28 residential renewable energy market of €33.6B (2016), which continues to grow rapidly. Our founder has created hundreds of energy jobs in Europe.
Solenco won the Hansa Green Tour Startup Challenge in 2018 and will earn 530,000 Euros in 2019.