What solar panel is needed to charge four 12 volt batteries? http://freerenergy.com/blog/engineering/what-solar-panel-is-needed-to-charge-four-12-volt-batteries Tue, 27 Oct 2009 13:06:02 +0000 http://backend.userland.com/rss092 en What solar panel is needed to charge four 12 volt batteries? Jimmy C asked: What solar panel is needed to charge four 12 volt batteries? Voltage? Amperage? Wattage? the batteries are car batteries and they are hooked up in series. That's all I know since it's not my project it's someone elses.Make Home Solar Panels http://freerenergy.com/blog/engineering/what-solar-panel-is-needed-to-charge-four-12-volt-batteries