A few days ago I took the plunge and mounted two 100 watt Renogy panels to the roof. It went easier than expected, but the hardest part was squeezing the trigger on the drill to punch through the roof!
I connected the two 100 watt panels in parallel to a 30A PWM Wanderer charge controller and then to my 2x6V battery bank. I placed the panels in the front of the unit onthe curb side. This allows me to add two more across the front of the trailer with the entry coming down into the wardrobe beside the bed. My fridge vent is near the rear of the trailer which puts everything too far away from the batteries. Entry into the wardrobe is discrete and keeps the wires hidden and is a straight shot down into the outside storage where I mounted the charge controller.
I pre-drilled the holes for the z-mounts then pumped Dicor into them before screwing them down. I was only able to hit one truss, and that was at the back of the panels. I am really hoping that they will stay put against head winds when driving. One thing i regret is not using a different mounting system. Those z-mounts do not make it easy to remove the panels from them as the panels end up being bolted from the underside. Renogy makes side mounted mounts which i discovered after the install that I would have preferred
https://ca.renogy.com/renogy-solar-p...cket-set-of-4/
I used a weatherproof PVC junction box
https://www.gescan.com/products/15-e...ction-box-gray and drilled two holes to install the entry glands
https://www.gescan.com/products/11-c...lief-connector.
I inserted a 3/4" piece of conduit I had laying around and used it as a raceway into the wardrobe below. I chose this method vs the Renogy entry glad I had purchased so I could access everything and I would have an entry point into the trailer for any future needs.
I played around with using the raceway at the front of the awning, but the factory installed silicone was so well done that I could only squeeze one of the 10AWG cables in to the wardrobe. It would have been a great way to get in, but it just didn't work and i didn't want to damage any wires in there as repairing them would have been a nightmare.
I am pleased with the way it has turned out - room for expansion and discrete wiring. I still have to add fuses on both sides of the controller and will most likely add a shut off on the panel side of the charge controller. My plan as well is to get the 40A Rover which is a MPPT controller before adding more panels.
I will add more pics, but this how it looked before I picked up the self leveling Dicor and did a second coat over the non sag. This picture was taken before I added the branch connectors to complete the parallel connection
https://www.amazon.ca/gp/product/B07ZCMPSFW
I am open to suggestions on the whole set up, and for securing the cables to the roof. I need to be able to remove the MC4 branch connectors at some point to add the 3rd and 4th panels so don't want anything too permanent, but also would feel better if they were secured to the roof.