I have a 1.8V Eliminator Solar Charger. How long would it take to charge an almost dead 12V car battery?
Also, what’s the best inexpensive solar charger I can get that will recharge a 12V car battery relatively quickly (like in a matter of hours rather then days or weeks)?
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3 Responses to “I have a 1.8V Eliminator Solar Charger. How long would it take to charge an almost dead 12V car battery?”
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24 to 48 hours.
Remember that if a battery was slowly discharged then you will need to slowly recharge it because charging it fast will cook it and it is just the opposite for a battery that was discharged fast.
These things are used to maintain a battery, I doubt you could fully charge a battery with a small solar charger. You may only have 6-8 hrs of effective sunlight per day, and depending where you are many cloudy days.
I am guessing you meant 1.8 Watt not 1.8 Volt? If it is 1.8 volts you could only charge a small double A battery or the like.
You will never charge a car battery with a 1.8 watt solar charger.
I don’t know the math right off hand to convert Cold Cranking Amps over to Amp-Hours. Car batteries use Cold Cranking Amps where Solar batteries normally are rated in AH.
It normally takes a minium of 5% rate of charge but should be 10%. So if you have a 100 AH battery at 12 volts.
100 times 12 = 1200 watts. 10% would be 120 watts in solar power or about 10 amps.
Now something else to think about is what do you call dead?
If you took 50% of the power out of the 100 AH battery you would have draned it by 50 Amps. At 10 amps from the 120 watt panel would take a min of 5 hours of sun. And there will be some power loss in the system.