
Today I attended a presentation on a very concrete topic: self-efficiency with photovoltaic and hydrogen. Michael Schubert works for Fronius International GmbH, which proposes the model of a self-sufficient house based in Central Europe. One major problem of solar energy is the storage. Here, Fronius International proposes a storage system based on hydrogen gas:
The roof top of the house is covered with photovoltaic panels which produce electricity. This electricity is used to split water into hydrogen and oxygen. The hydrogen gas is stored at a high pressure, and converted back to electricity when required. If the heat waste is used for heating, the process efficiency is said to be >80%!