Adding an extra battery to the truck for electronics?

I'm talking about the fridge overnight. If you run your truck during the day overnight is minimum electric usage.

If the truck sits all day in the hot sun I would agree that would use more.

 

I had it in one of my trucks. I just put the extra battery and a small inverter under the bed. Mounted a cutoff switch to the face of the bed frame and drilled holes in the floor under the bed and ran wires to the main batteries. Don’t forget to isolate / insulate / grommet the wires through the floor or you’ll have a big electric fire when it shorts out.

 

I run fridge/freezer, bunk heater, and charge all my electronics for 10 hours on four batteries. No issues.

 

I'm a fan of the Super Start AGM batteries at Orielly's ... made by east penn. Not super expensive for what they are.

 

Dometic

 

Dometics are super efficient. They even run on 12v for a few days before batteries run out.

 

Grab a lithium to put under the bunk for $300. Put it in an isolator.