An inverter, fuel cells and a control system. When hydrogen expences are lower than electricity prices, the owner earns money. This is only possible in areas where a continous supply of hydrogen is obtainable, this means in the cities. Solar cells Solar cell roofs and walls have become a way of expressing green attitude. As an expensive car was a status symbol in the 1990 s, a solar powered house is a status symbol today.
Solar cells are also very practical as building materials.
They don t need any maintenance such as painting. Wind power has become a common sight in the countryside. The reason is mainly the use of transversal generators. Transversal generators are very cheap to produce, but they demand much power electronics. Back in the year 2000, the power electronics were too expensive, but this has changed.