The Fridge usually draws between 5 & 8 amps, the battery charger does not draw a lot because it charges at a very low voltage. You do need to leave the 12 volt power on to run the Fridge. The Fridge and other fathom loads will use the 12 volts as well and this cycle could over long periods of time cause the battery to get less than a full charge. It would take awhile for that to happen though. Make sure you go every few weeks to check the distilled water in the batteries as the constant draw and charge cycles will use it up.
2005 Safari Cheetah 38PDQ - 2009 Ford Flex
Me (Gatogonow), The Boss (DW), Honey Bunny, Maggie May and Mollie Kay (The Gatos)!