When mounting solar panels to your RV roof, the two most important factors are:

• Security -- Panels must withstand 200km/h (120mph) winds while your vehicle is in motion! Driving at highway speeds with high headwinds or strong gusts can subject the solar panels to these kinds of winds. All it takes is a short wind gust to break a panel off from a weak mount, and this, of course, could be disastrous!

• Water Leaks -- Mounting points must not cause water leaks. We recommend using a product called "Dicor" to seal your solar panel mounts to your roof. Dicor is a self-levelling caulking compound that is meant to be used on the roofs of RVs as a sealant for everything (roof vents, TV antennas, solar panel mounts, A/C, the edges of the roof, and anything else that is attached to the roof.also,you can choose the sikaflex 252 for sealing.

For most RV solar applications, we recommend flat (non-tilting) mounts with the use of Z brackets(product link:http://brightsolar-power.com/index.php/product/view/97.html). our Z mounts are simple, and can be mounted very securely. If you do, however, use your RV in the winter months, we would recommend tilt mounts to allow for maximum power when the sun is low in the sky. We do not currently offer tilt mounts. Flat mounts have the benefit of low maintenance and less set-up and take-down work, which benefits weekend campers or RV users who do not stay in one spot for a long time.

When mounting solar panels using Z brackets, we recommend fastening the front mounts into a roof rafter with longer screws (roof rafters can be found with a stud finder), then fastening the back mounts into the roof sheathing (plywood) with shorter screws that do not exceed the thickness of the roof plywood. A small angled deflector on the leading edge of each solar panel will assist with removing up-lift force from airflow beneath the panel. Do not, however, surround the panel with deflectors -- the panel needs airflow beneath to keep it cool while parked. Pre-drill all holes and apply Dicor into and surrounding each hole, then place the bracket over the hole, screw it to the surface, then cover the base of the bracket with more Dicor. At least once per season, check all mounts for strength, and apply Dicor as needed to maintain the seal.