I wanted to add solar panels to my travel truck, which meant installing a sturdy rack to mount the panels on. Instead of buying an expensive roof rack system, I commissioned a simple steel rack at the SLO MakerSpace, and then installed it on the fiberglass camper shell using stainless steel hardware, DIY neoprene gaskets, and a lot of silicone sealant. The solar panel mounts are bolted onto the rack, so we can swap in new brackets if we want to upgrade our panels, or remove them completely and have a cargo rack.
- DIY steel roof rack, 36″ x 48″. Thanks to MakerSpace Nate for the welding help!
- Masking tape
- Small piece of 2×4 to brace the camper shell while drilling
- Mineral spirits
- Black spray paint/primer for metal
- Stainless steel hardware: flat washer, 1.5″ button head bolt, locking washer, nut. We needed 8 sets of hardware for our rack.
- 2 feet of black webbing, used to create permanent hangers for mounting a cargo net inside the shell
- 1/8″ neoprene sheet gasket, cut to size with scissors. I used this one:http://www.amazon.com/gp/product/B0075DXNTA?psc=1&…
- Silicone sealant
- Cargo net, for storing lightweight items.http://www.amazon.com/gp/product/B00K73QBKS?psc=1&…
- Cordless drill
- Spray paint handle – optional but highly recommended
- Caulk gun
- Woodburning tool
Step 1: Drilling the holes and prepping the rack
First, I put the rack on top of the camper shell, making sure to align it on all sides. Then I stuck blue painter’s tape under each mounting foot, marked the spots for the mounting holes, and removed the rack. Here’s the process we used for drilling through the fiberglass, which turned out to be super easy:
- Drill through the marking tape, staring with the drill in reverse. This gets you through the top gel coat without cracking.
- Use a fast drill speed, but don’t put a lot of pressure on the drill.
- Have a helper press a piece of wood up from the inside of the shell, to brace it against the pressure of the drill.
- Drill a slightly larger (1/32″) hole than your bolt or screw size. It was tough to get the bolt through several layers of washer/shell/gasket/rack without a little wiggle room.
I drilled all 8 mounting holes with no problem. Using the drill bit as as guide, I measured the thickness of the shell at 1 inch, so I needed bolts about 1.5″ long to accommodate the mounting washers and nuts.
Next, I cleaned the rack and panel mounting brackets with mineral spirits to remove grease and dirt, then gave them three coats of black semi-gloss spray paint. The spray can handle is definitely worth the extra $5.