Another quality criterion for batteries is the self discharge. This determines how long a battery can be stored and how much power is necessary to hold the charge.
Tank with liquid hydrogen
The tank with liquid hydrogen has a quite extreme self discharge. By the Opel Zafira hydrogen presentation, 14 days had been mentioned for the complete self discharge of the tank. Then 4 kgs of hydrogen with 133 kWh of chemical energy are simply away. To produce this again with electrolysis and to liquefy the hydrogen and transport it again to the gas station are about 200 kWh necessary. This translates to 600 watts self discahrge of the hydrogen tank of a car.
Extrem high standby consumption
Save electric power! The hunt for the high standby power usage. Some old television or satellite receivers are using really 15 W for standby. 131 kWh per year! As much as a small refrigerator.
But what should one say about a car's tank of liguid hydrogen? 600 watts Standby power usage! 5265 kWh per year. Almost triple my electric power bill of 2003 for 4 persons household with 2 computer workplaces.
29250 km with Peugeot 106 electric
Only with the self discharge of the liquid hydrogen fuel tank, a Peugeot 106 electric could drive 29,250 kms per year. Really a joke! But if a big group like General Motors presents a joke as a serious future vision, it takes sometimes a long time to find out what the joke is.