Help wiring 4 12volt batteries to make 24 volts (passive solar forum at permies)
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A Resourceful Way To Have A Charger: How To Make Your Own 12-Volt Battery Charger. - BRILLIANT DIY
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How to connect two 12v batteries to make 24v, Two 12 volt batteries to make 24 volts | Solar diy projects, 12v batteries, Interesting science fair projects
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