12 Nov 2011 @ 12:26 PM 
solar panel16 What exactly does my car solar panel charge?
Luxe asked:


I have an 04 VW Jetta that came with a solar panel that plugs into the cigarette lighter. Does this charge the battery? I forgot to ask the previous owner, and it does not say on the actual solar panel.

Sorry if this is a dumb or obvious question but I know nothing of cars, and no one else seems to know the answer.

Thanks for any help.

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Last Edit: 31 Dec 2011 @ 12:21 AM

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  1. Make Solar Panels

    uh that would be a “yes” to your question. All it does is trickle charge the battery. I take it you leave it on your dash to block out the sun like a normal screen.

    Its a good thing to have, but your battery wont last forever. You will still have to swap out a new battery every few years; for example if the battery is a five year battery, get a new one after about four years. Give or take a few months, its better to have a margin of safety, than to be stuck out in the middle of nowhere just because you have a dead battery.

  2. Trinity says:

    It “trickle charges” your car’s 12v battery.
    It won’t replace a substantial loss of energy from your battery, but it helps a little at keeping it topped off if you aren’t pulling too many amps while driving.

    Leave it plugged in. Can’t hurt. :)

  3. lane_337_gti says:

    As others have said it is a trickle charger, but much of the other information they provided is wrong.

    There is no reason why you can’t expect a full life out of a battery if properly maintained. That is if it is a wet cell battery you maintain the fluid in it with distilled water and have a charger/conditioner on it once a year. The trickle charger you have really isn’t needed unless you leave your vehicle parked for long periods of time. VAG/VW (Volkswagen Automotive Group) started sending those chargers with their vehicles so the battery did not die when it sat on a storage/auto lot before they were sold.

    I honestly wouldn’t really worry about using it unless you leave it parked for long periods. (we are talking weeks).

    I am providing a link on how to properly check/service your battery.

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