A simple marine battery switch, A or B or Both will take care of isolating the batteries from your charging system. Just requires you to manually select which battery to charge. The draw back is if placed in both then both of your batteries will see the same loading and won't be properly balanced.
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Axis 24.1 E 450 chassis, 6 spd tranny. GVWR 14500# GVCWR 22000 # GW(scales) 12400 #
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mods: 2- 100 watt solar panels, on roof, 300 watts portable
“They who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety.” Benjamin Franklin
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