Figure out the wattage you plan on using in your RV. The easiest way to do so is using an online RV Solar Panel Calculator (see Resources).Once you figure out the amount of energy you will need, buy the appropriate number of solar panels for this amount. Generally panels come in 100 watts, so if you need 375 watts, buy four.
Disconnect all the power to the RV. Do not run the generator.
Wait about 10 minutes, to allow the power to run out.
Cover the face of the solar panel with cardboard or a towel.
Climb up on your RV roof and choose an unobstructed location with easy accessibility for the wiring. It is easiest to run the wires down the refrigerator vent.
Place the panel with the width facing towards you.
Place the unit in its location and drill holes where the mounting screws will go. Add sealant to the holes; the best type to use is caulk.
Mount the panel by placing a screw in each hole and tightening it.
Feed the wires down the refrigerator vent. Be careful to not bump or dislodge other equipment wires that already run through the vent.
Find an easily accessible location for the regulator inside your RV. The best spot is above the refrigerator, where it is easy to access but not obtrusive.
Cut the opening for the solar panel regulator. Measure the depth, width, and height of your regulator and draw a guide matching these measurements on the wall. Use the saw to cut a hole along those lines, but only as deep as the regulator. Pull the two sets of wires out through the hole.
Attach the wires to the back of the regulator. Be sure that the wires are connected correctly by polarity. White wires are usually ground and black wires are positive. However, on the regulator the black wire is negative and the red wire positive.
Connect the battery with the correct polarity to the regulator. White wires are ground and black wires are positive.
Attach the regulator to the wall with screws.
