BMW 7 hydrogen

Electrolysis and liquefaction of hydrogen requires much electric power. The vehicle needs about 8 times more electric power than a plug-in-hybrid of the same size.

The electrolysis requires about 40 kWh per kg hydrogen. To bring the hydrogen into the tank, further 12 kWh for liquefaction are necessary. The consumption ist 3,9 kg hydrogen for 100 km. This are 202,8 kWh / 100km

The photovoltaic world production was 2006 only 0,4 Watt peak per human. For 20.000 km a year with the BMW 7 hydrogen are in Germany about 40 kW photovoltaic required.

The future of our mobility will be electric, but with a high efficient system, no substantial chain of looses like electrolysis, liquefaction and internal combusion engine, disadvantaged by 1:8 aginst the state of the technology.

Drive energy	CO2 emission	g/km
Gasoline 12 Cylinder 13,5 l		319
Diesel 8 Cylinder 9,5 l		253
Lignite 202,8 kWh		2231
Coal		1825
German electricity mix 2007		1042
natural gas		740
Austrian electricity mix		511
Austrian railways electricity mix		243
Photovoltaic / Wind energy		81

It demands the extrem clear energy mix of the Austrian reilways - 86% water power, 14% fossile - to be at the CO2 emission at last between 8 cylinder Diesel and 6 cylinder Diesel.