The instructions that come with the solar regulator will identify the wire thickness required depending on your distances. Most Caravan and RV applications will use 6mm square UV stabilised wire to connect the regulator, battery and solar panels. All connectors need to be waterproof. MC4 connectors are generally used for solar connection. Step 1: Connect the Battery. Note: Fire and explosion may occur if the positive and negative terminals of the battery are short-circuited. Make sure the battery voltage is higher than 6V if system is 12V, then start the controller before connecting the battery to the solar system. Make sure the battery voltage is not lower than 18V if the A fully charged 12 volt battery will actually show about 12.5 volts. In addition an 80w solar panel will only deliver 66% of what a 120w panel will. That’s not too much of a problem if it’s summer time but at this time of year, with heavy overcast clouds no solar panel is going to generate much. Unlock the power of your caravan's electrical system with detailed wiring diagrams. From 12V electrics to 240V systems, solar charge controllers, MPPT circuits, Victron Easy Solar setups, fuses, and RCD protection, we've got you covered. Maximize your caravan's energy setup with expert diagrams. Also, the application may change, which is a better choice. A circuit breaker is easier to manage if your solar panel is attached to a home. A fuse will be easier to manage if your solar panel is attached to a caravan. Sources. Solar Integrated Solar Roof Panel System installation Manual; Installation Guide – Department of Public Works, Los Mr. Twine said if a home handyman was to install solar panels on a caravan and just purchased a normal silicone sealant for the job, that might only last three years – and even a high-end “sikaflex” type construction adhesive product wasn’t sufficient. In the case of his camper trailer, it only lasted 4 years. Step #3: Select the appropriate fuse holder. After you have chosen the appropriate fuse, you will need to grab a fuse holder for it. The choice of fuse holder really comes down to the purpose of the fuse and environmental factors. There are two types of fuse holder: inline and block. Inline blade fuse holder. For series, at the 57 volts and 9 amps, we can use 10 gauge wire for anything under 70 feet from the panels to the charge controller. In Parallel, we can use 10 gauge wire from the solar panels to the combiner box, but only if the longest wire length is shorter than 24 feet. After the Combiner Box, since our amps ramp up to a little over 27, we QVMC2.