Waterproof Silicone Flexible Heating Pad 60*60MM DC 12V 10W

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For safeties sake, I would be more conservative than 32F, and aim for 38F as your minimum charge target.

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The moderate heating of compartment itself is working out pretty good, but the metal floor is just a heat sucker from the cells. Which begs the question, isn't a heating pad just a wire run up and down the insides of a rubber pad?

The wire was then just wrapped round hooks at the end of the frame is a zigzag pattern to use up the calculated length. If needed, the rubber heating pad can be shortened an inch or two using scissors, but care must be taken not to cut the 12 volt wires extending into the pad itself. We then used red and black electrical tape to identify the positive (red) and negative (black) connections for easy assembly later.

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The pad is long enough to cover the back and two sides of an Expion360 Viper Group-24 battery (if applicable, leave the front removable BMS panel accessible for maintenance). I'm going to insulate the entire inside floor with foam board and put the rubber mat on top of it, along with pulling the batteries out again and adding the foam board under the rubber mat already in place.

The heating pad can be connected to the 12v fuse panel with a switch added inline to turn it on/ off if needed. Picasso, I've never seen one of these heating pads in person that's I'm wondering about the placement of it. Make sure you have enough amp hours available in the battery to pre-heat and to keep the batteries warm during charging.

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I would actually measure the resistance of several meters as the resistance of one meter would be quite low. As a fulltimer living off lfp/ solar not being able to charge the batteries could be an issue as I recently found out. I think you could wire one of them to control the ones with built in thermostats but, seems too jury rigged to me.After the thermal wraps are in place, wire each heating pad to the main fuse panel or directly to the lithium battery using the included 10 amp fuse (we installed ours directly to the batteries using positive and negative bus bars). The ambient temperature sensor sits between the battery case and wiring harness, allowing the heat pad to only be turned on when below 35°F.