Quote:
Originally Posted by jamesqf
Likewise batteries: you might have a 99.9% efficient battery, but if one that holds the energy equivalent to a gallon of gas weighs several tons, it's not much practical use.
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Current tech batteries are about 80-85lbs for the actual usable energy in a gallon of gasoline.
Assumptions:
33,700 wh per gallon of gasoline.
250 wh/kg of good lithium batteries
25% actual thermal efficiency of the ICE (about right for a normal car)
33700/250=134.8kg
134.8kg*0.25=33.7kg
33.7kg=74 lbs
Add a bit for motor/motor controller losses.
Quote:
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14 liter of hydrogen = 1 kg of hydrogen @ 1 bar
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This is incorrect. Look at your source again. That's 1 liter of liquid hydrogen. Good luck carrying that around. 1kg of hydrogen gas at 1 atmosphere is 11.126m^3, or 11,126 literally.