To charge a lead acid battery you need at least 16 or 17 OCV (open circuit volts). I hooked up 15.5 OCV worth of panels to a battery last month and it pushed almost no power into the battery.
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Originally Posted by dieselbeetle
Ok, now that we've established the fact that it CAN assist, how much?
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How much roof you got on your car and how deep is your wallet?
Those are the only limits I can think of.
I plan on building two 8 amp 17v panels to put on the roof of my suburban and if I get enough power out of them during day light hours I will experment with running with no alternator belt. I have all the materials, just need the time to do it.
If (not very likely) that the solar panels work good I am going to look into building a tool-less alternator belt quick relase system.
If they don't work they will be serriesed up and put to work running a grid tie inverter.