[ShrimpBurrito]

Looks interesting. It appears that 10mm2 is about an 8 AWG wire. Not real big, but probably better than what you have now. You can also use the new wire and the Bargman wire in parallel. If you're going to run a new wire, you're probably also going to want to run another ground lead.

If you want to have a more predictable result in determining what size wire you should install, you need to decide how much current you want to have at the battery (and thus drawn by the charger) and try to predict what the resistance will be. If you don't have enough current, you obviously need a bigger wire.

I like my charger, but ever since upgrading to interior LED lights, I monitor our power consumption way less than I used too -- it's really only an issue in the winter when the furnace is running.

Dave