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13.5 volts not OK. In order to properly charge a car battery, for example, the charging voltage needs to more than this intrinsic voltage of the battery. A car's charge voltage from the generator is 16 - 18 volts which provided electron flow back into the battery. If the rated output of this solar panel is 12 or 13.5 volts, that won't do it.
I meant it says 12 volt setups and want to know if will work on 24 volt setups
I have a 20 watt panel I believe puts out 1.8 amps. and a controller. can I hook this up to a 24v trolling motor while in dock and get a charge and would I hook up neg post on one positive on other. Some else said this panel and controller would work but it says for 24 volt setups.
I have gone through your blog "How to charge a 12 volt battery using Solar Power" this is such a good topic. I really enjoyed a lot and the blog is really very interesting.
<a href="http://www.electricalgeneratorsltd.com/">Diesel Generators</a>
seconding what the other commenter said: this is a fine tutorial showig how a 12v battery can be boosted, but that or any tiny solar panel is only going to generate 250 ma or so in full sunlight . If you're charging a smallish 12v battery that is 25 ah (=25000ma). Even assuming all of the charge was retained by the battery (usually you need to put an extra 10 -20% in) you're talking 100 hours in the sun. Yes it could trickle/keep topped up, which is a great use for it - but not a normal charge from 'used last week' to 'I want to use it next week'.
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