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· Master Mariner
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Unless something has changed since I installed my solar system, solar panels do not produce 12 volts. They produce something in the neighborhood of 18 volts, which is why a charge controller is necessary. 18 volts is too much for a 12 volt system and not enough for a 24 volt system.
You only need to find a charge controller that will handle the max amps produced by your panel at it's rated output voltage and connect it to your system. I did not investigate 24 volts set up because I wasn't doing one, but each charge controller will have a data sheet and connection diagram for the voltage you wish to use, I believe up to 48 volts, but you will need to check.
 
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