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Old 03-07-2012, 23:17   #212
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Join Date: May 2004
Location: North Austin, Texas
Posts: 848

Actually solar panels are usually listed at a lot higher voltage. It's normal for a '12v' solar panel to actually put out 17 volts. A good charge controller (which you should have for a solar install) will regulate that down. Most gel or SLA batteries need 13.2 to 14v to charge, so you don't want exactly 12v. Also, if you have a solar panel that was exactly 12v and it gets cloudy, you'll loose some voltage. By starting off with 17+, it can help overcome that.
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