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how much surface area do you have for panels? you only get full power in direct perpendicular arrays. impossible in the winter up north maybe not so hard in new mexico?
if your panel is big enough you might not even need it for long drives. how are you handling charging that battery? what charge controller you using?
what battery pack capacity and price are you looking at? always interested in new cheap sources of lifepo4 goodness.
do you know what the "draw" is of your car management system. I think the metro is only 7 amps or so ie a slightly larger panel might get you real time power capacity!
what I would love to do is mount an AC clutch pulley to the alternator so it "free wheels" and automate it such that when the power is too low the clutch is triggered and bingo you have alternator power again.
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