Solar Install question

VAHillbilly wrote:
I am planning to install two 160 watt panels on the roof of a Class C RV. I would like to make the installation where I can add another 160 watt panel if needed in the future. The wiring will be in parallel down to a MPPT controller. I anticipate about a 20' run of wire from the roof to the controller and then probably less than 3' to the batteries (two 6 volt GC).

I am thinking I should use #6 marine wire from the roof to controller and the same to the batteries. The panels will have what I think is #12 wires to MC4 connectors.

My question is what type connectors or small junction box should I use from the panel pigtails to the #6 wire? Also what type fusing and disconnect switches should I use. Frankly any recommendations for a properly designed system to handle 320 to 480 watts of PV output would be greatly appreciated.

Any recommendations even specific brands, part numbers etc. would be most helpful. I am a bit of a neophyte on this but when I see factory mounted systems using 12 gauge wire and low end controllers I know there has to be a better way.

You seem to be planning an identical system to what I already have on my motorhome. I have two top of the line 160W panels ( Grape Solar ) feeding a Blue Sky Solar Boost 3000i charge controller, ( Solar Boost 3000i ) with 8 AWG wire. The system works just fine at maximum efficiency and I have room to add one more 160W panel with this controller. I run my panels in parallel to a custom refrigerator vent combiner box made by AM Solar, ( Combiner Box ). No fuses needed between the solar panels and the charge controller, despite what you made have read here previously ... but a fuse or breaker is recommended between the controller and the batteries. I used this model: Blue Sea 30A breaker