If you're running a standard deep cycle group 24 12 VDC battery, yes, your RV systems can easily drain the battery to 10.6VDC or below in 12 hours. You must remember that in addition to running your water pump, lights and hot water ignition circuit, not only the reefer that's operating, but the CO detector, the Propane detector, the stereo memory circuits plus what ever "ambient" drains are present on your system. Most of the side by side reefers have two fans in the back to aid circulation plus two separate cooling units with their separate electronic monitoring systems. You also have the normal operation energy demands. Also, if you check, you'll probably find that there is a "high humidity" switch located on the eyebrow control panel. That switch turns on a heater circuit in the door panels to keep condensation from forming. It's a convenience item, not needed, but draws a tremendous amount of battery power. It's a great convenience when on shore power, but is a battery killer when boondocking.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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