rwiegand wrote:
12 ga is fine for a trickle type battery maintainer, but apparently will be severely limiting if you're trying to charge your batteries. I was advised that the 150 watt panel I just installed needed 8 ga cables to work effectively. On my 2007 851 we fished new wires down to the battery compartment. Same problem, it seems, as trying to charge your house batteries on the wire in the trailer hitch circuit, that also needs to get bumped up to 8 ga to work well.
+1
I have a 1030. I found the roof plug and even where it went inside. However, based on many comments like this one, when I installed ~300 Watts of panels, I ignored it and ran my own 10 ga wires down through the refrigerator vent.
Good Luck