
698 Solar Bicycles, Mercedes, Handcuffs—PlusEnergy Buildings
however, produced 127 Wh, it remained a net energy surplus of
57 Wh per kg/battery! The “Spirit of Biel” needed 55 kWh for
3007 km, i.e. 0.018 kWh/km or 18 W/km ≈ approx. 1.8 dl full
for 100 km! Apart from comfort, this meant that already in 1990
solarcars were 55 times more efficient than average cars. Compared
to 1987, in 1990 all solarcars had environmental-friendly silicium
solar cells. The only exemption was “Solar Flair” of California
Polytechnic University/USA. It used (toxic) gallium-arsenide solar
cells that are usually used in space. Nevertheless, the California
Polytechnic University ...