In part 2 of this series I added a video that showed you how to wire photovoltaic cells together. In this post I will describe the best practice to connect the entire system together (batteries, regulator, panels).
Open space on your roof, and the number of panels you decide to install (typically 2) will determine where on your roof you can install solar panels. It is best to find the shortest wiring distance as possible from the panels to the battery bank.
8 gauge wire is the ideal size to use for your entire solar system. It will handle the fluctuating current best. Wires should be run inside flexible conduit to protect them from the sun’s UV rays. If you can run the wires through an existing vent such as the refrigerator it is better than drilling holes that could leak over time.
If installing more then one panel wire them in parallel. Solar panels do not provide consistent current, therefore a regulator is required to make sure batteries are not over charged. Panels are wired to the regulator, both positive and negative wires run into the regulator (a.k.a charge controller). A fuse or breaker should be installed on the positive wire between the regulator and the batteries. The fuse or breaker should be rated 5amps higher than the capacity of the panels, and then to the corresponding battery terminals. From the batteries the standard RV wiring is sufficient to have DC power that runs lights and some other appliances. From the batteries power runs into a inverter that powers larger appliances. Fuses or breakers should be placed between the batteries and the DC appliances and a fuse between the batteries and the inverter, if not already equipped.
Let me know if you have specific questions.