I'm topping up my battery system for the RV. It consists of 4 Trojan T-105 6 volt batteries wired in series to double the volts to 12v and then in parallel to double the amp hours. Links researched to set this up and water the batteries are below:
[ Ссылка ]
[ Ссылка ]

And here is one for AC to DC amp conversion: [ Ссылка ]

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