Solar panels. In this campervan electrical system, we have four 18V monocrystalline solar panels wired in series, bringing the total voltage up to 72V. The total wattage is 400W. The positive and negative wires run through a solar cable entry gland in the roof. 6 mm² wire is typically used for solar cables.. The diagram above outlines in the most simplistic terms, my camper van electrical design. Using the formula explained here, I calculated I'd need about 80 amp hours (ah) per day including contingency. Assuming the batteries are 50% efficient, I'd need to fit 160ah batteries. I installed 230ah batteries so have extra contingency too.

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Step 1 | Determine the current rating (i.e., amps) for every appliance you expect to use in your campervan. Some appliances will state their rating as watts rather than amps. For 12 volt components like your fridge, campervan lights, and USB phone charger, for example, the calculation is: Amps = Watts / 12 volts.. Our campervan wiring diagram can be used to understand how to wire a campervan. Our system consists of: Power coming in via a a battery to battery charger and a solar charge controller; Power going out via a 12V fuse box and a 500VA inverter; We chose to install an inverter in our campervan electrical system so that we could have 230V power in.