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ct1500's avatar
ct1500
Explorer
Apr 07, 2017

Dual battery set-up using chassis battery

Has anyone incorporated their truck's OEM 12v battery with their camper's battery(ies)?

I'm brainstorming a way to do this and would appreciate some input. I'm thinking that if I run large (1/0g) wire from my truck battery to the coach/camper, then I could connect them in parallel, thus turning my truck chassis into a generator.

I think I'd need some sort of D/C to D/C charge manager to put in between the two batteries to make sure the trucks battery doesn't become too depleted.

Any thoughts on whether I could run a large (2000w) true sine inverter using this set-up with the truck's motor running? It'd be nice to run the camper's A/C for short periods of time without buying a Honda 2000Eu.

Appreciate any input! Thanks!!

23 Replies

  • ct1500 You could get a hybrid inverter. That would take care of the start up surge.

    You could also get a Micro Air Easy start. http://www.microair.net/main/products/product.php?id=20

    I just ordered one.
  • Thanks for the input.

    I've been told the Coleman 9 can run on the Honda eu2000, which has specs of: 120V 2000W max. (16.7A) 1600W rated (13.3A).

    I'm not sure if it's feasible to use a dc to ac inverter to achieve similar output to the Honda, or not.
  • Some thoughts.

    Car batteries don't do well when discharged. You'd be better off adding a second battery even if you installed in your truck bed or underneath. You'd have a hard time running a AC on a 2000w inverter. Many generators won't run them.

    Better is to reduce your 12V power consumption. Switch to LEDs and reduce other appliances that use 12V and then add insulation, mesh shade, and window tinting to reduce the felt heat.