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Originally Posted by Ken Maltby
I would think that these splitters are wired in parallel:
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Yes, the splitters mentioned are wired in parallel. As long as the panels have built in protection diodes, they work fine wired this way.
(For my project, I'm not using these 12V car style splitters. I've removed the lighter plugs from the panel cables and replaced them with small barrel connectors, which plug directly into my electronic control box.)
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For this sized project you might consider any unused UPS batteries that you might have on hand.
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The "gel cell" battery from a UPS is exactly what I'm using. My charge control circuit is designed specifically for this type of battery and generally wouldn't work properly with any other type.