Would Charging Battery Bank Through Trailer Wiring Accessory Circuit Damage Vehicle Wiring

Question:

Hello, I have two 80 watt coolers in my travel trailer that I want to power while towing the trailer. The 12v charge line on my 7 way is not powerful enough to support even just one cooler. So, Im adding a dual battery pack to the trailer. My question is, will this additional power create a problem for the tow vehicle 12v trailer connection? In others words, will my additional battery pack overload the tow vehicles trailer power? If so, what is your recommendation? An Isolator? A simple toggle switch to disconnect the tow vehicle 12v? Cooler spec is 80 watt 6.5A for one which is the max draw, but since they will already be cool I expect the power draw to be less. However, it is always best to account for the higher draw demand in case you need it. Thanks

asked by: Rich H

Expert Reply:

Now the power draw from the 12 volt accessory circuit of your 7-way would not overdraw or damage the vehicle battery as you plan to use it. It will simply put a light charge on the battery bank when connected to maintain them and won't hurt your vehicle at all.

You'd want to run 10 gauge wire from the battery to the 7-way connector like with part # 10-1-1 which is sold by the foot.

expert reply by: Jameson C