How to connect solar panels to batteries?
I have two solar panels that were going to be trashed at work. I want to use them to charge batteries on my RV but i noticed they put out around 20 volts in direct sunlight. So i am wondering: -isn't this way too much voltage for a 12 volt system? -do a need some sort of a regulator connected to keep them from overcharging?
Asked By: Jesse - 7/4/2010
Best Answer - Chosen by Asker
20 volts is a common open-circuit voltage for nominal 12v panels. The panels put out about 15v at full load. If the panel puts out little enough that it takes 20 hours or more to put a full charge in the battery you can get by without a charge controller - just keep the cells topped up with distilled water. A charge... More
Answered By: virtualguy92107 - 7/4/2010
Additional Answers (2)
You can use them without the regulator . Just make sure you use blocking diodes so the the power does not flow back into the panels . You can get those at radio shack of some electronic store or off eBay for a few bucks .
Answered By: Dads boy - 7/4/2010
You want the panel that is charging the battery to be higher voltage than the battery. A fully charged 12V battery is over 14V. A 12V solar panel puts out between 17V - 20V, so that's a good size for your battery. They name them all 12V to help show what works together (like Garanimal clothes... More
Answered By: Amy - 7/6/2010
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