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Normally I would agree. but in a car like a Geo Metro XFI the car itself even with electric pump uses SO little power that just installing 2 deep cycles will give you a WEEKS run time between charges. unlimited time in summer with just a couple decent solar panels.
now the engine does absolutely nothing but "move the car"
in something like my van or my pops towncar. well battery would not last an hour.
but the metro needs so little power. even my 5.1 surround sound only takes 30watts.
the problem with the air turbine power is that now your once again powering the water pump WITH YOUR ENGINE since your engine now has to work harder with higher drag.
by going pure electric and no alternator I transfer the power needs of that equipment to my multiple orders of magnitude cheaper HOUSE ELECTRIC power instead of my cars gas tank.
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