This chart is developed by, Yngve Tranoy for the Hydrogen House while he was working for IFE (institute for energy technology). It shows a principal sketch of the Hydrogen Stand Alone Power System (H-SAPS) concept. Solar energy serves the load directly (1) when possible. In cases of excess energy on the bus bar it loads the batteries for short-time energy storing (2) or produces hydrogen for long-term energy storage (3).