Unplug your motor home and disconnect the coach batteries. Remember to disconnect the negative terminal before the positive one. To avoid electric shock, never let the positive terminal touch any metal.
Determine the best location for solar panels on the roof by finding the pre-installed solar power connector if your motor home is equipped with one. The panel should be on an even, flat section of the roof, and you should be able to walk around it once it's installed. Use care to leave space around important roof utilities such as vents and antennas.
Attach mounting brackets to the panel and place the panel onto the roof. Always have an assistant when hoisting panels onto the roof. Use a step ladder, not your motor home's vertical ladder, to carry the panel to the rooftop.
Using a pencil, mark where you want the panel to go. If your motor home has plywood roofing materials of less than 1/2 an inch, you need to mount the brackets directly to your roof joists. Do not attach the panel in between plywood seams. Squeeze some rubber roof sealant in the penciled-in area where the mounting brackets will be attached. Lay the panel onto that spot. If sealant spills around the brackets, don't worry; the excess will provide a better seal.
Screw the panel onto your motor home roof. Then, use a generous amount of sealant to coat seams and screws. The goal is to avoid any future leaks in these areas.
Attach wires to the solar panel with the MC connectors. Or, use MC cables with built-in connectors instead. Lay the cables along your motor home roof and attach them at least every two feet by screwing wire clips into the roof. Cover all screwed-in areas with roof sealant.
