Battery trickle charger??

Thread Starter

badspell68

Joined May 10, 2008
20
My car sits for long periods of time without being used, so I would like to get a solar trickle charger. Any advice on what unit would be best for keeping a good charge on a car batt?
 

Audioguru

Joined Dec 20, 2007
11,249
I bought a solar trickle charger for only $9.99 on sale. Its output is 2.25W at 12V-13V and has a cigarette lighter plug.
 

SgtWookie

Joined Jul 17, 2007
22,210
The first one...would it really keep a car bat up to par?
I'm dubious about it being able to keep it up.

It would depend upon how much current is being used by your vehicle when it's not in use. There is always SOME drain, even just to maintain the radio memory and the clock.

And a solar cell only generates power during daylight hours, perhaps 1/2 day. Obviously, more in summer, less in winter.

So, if it's putting out 110mA in the light, it's putting out 0mA in the dark - or averaging around 55mA through the day.

You would need to measure your vehicle's static current drain.
First, charge your battery completely, perhaps for a day on a trickle charger. Then let it sit for several hours for the "surface charge" to drain off.

Then, disconnect the negative cable, and connect in an ammeter. See what the drain is.
 
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