Comments on: DIY Solar Car Battery Maintainer?

By: Mr Wolf

Mr Wolf — Wed, 30 Dec 2009 11:03:59 +0000

The solar panel you have is way too small to charge a car battery, even if you had several all wired up to give you 12V at 500mA it would take 1000 hours to recharge and average battery.
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By: dirocyn

dirocyn — Wed, 30 Dec 2009 10:57:59 +0000

Not connected to the DC port in the car, and probably not with the cell phone charger. You need to convert your voltage to close to right, at least in between 11 and 14 volts, connected to the + and – terminals on the battery. It shouldn’t take much of a charge just to maintain the battery if there’s no load, not enough amperage will be better than nothing. It should at least keep your battery charged enough that it won’t freeze.
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By: jtexas

jtexas — Wed, 30 Dec 2009 10:29:59 +0000

To keep a fully charged battery fully charged, you'd need at least 300ma at 13 volts.
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