The 6 cables mentioned below are orderly ranked next to each other in order to avoid a mesh. This was a great challenge after watching many You Tube instructions about electricity in the camper with a positive exception for Greg Virgo. Essentially it is quite simple, but all the cables make it complex. I made a clear distinction in users and producers and use only 2 distribution blocks and 1 fuse box (12V)
6 cables for light and USB (1,5mm2), water pump and heater (2,5 mm2), refrigerator (6 mm2) and 230V (2,5mm)
The positive (red) and negative distribution blocks including fusebox (backside). A cable lug plier and several cable lugs for appropriate thick cables are indispensable, as is a strip plier.
A passage through the outside wal is made for 230V. If available 230V is not only for the sockets but also for loading the battery if sunlight is scarce.
150Ah battery connected to the distribution blockes and monitor. If the battery is fully loaded, it will produce sufficient energy without solar panel, battery loader and dynamo for two days. Therefore a solar panel, loader and/or regularly driving are necessary.
Incoming cables of solarpanel to charge controller and from here to distribution blocks. The charge controller takes care that the electricity created by the solar panel is suitable to load the battery.
The electric circuit breaker (with 100A fuse) between the positive distribution block and the positive pole of the battery makes it easy to disconnect the battery from users and producers. The grounding is connected to the negative distribution block.
Starter battery is connected to the camper battery by 25mm2 cables and with inbetween a relay (not shown) to prevent that the camper battery suffers from starting the motor. When the camper battery is loaded the starter battery is also loaded and the other way around. The 100A fuse is located at the fuse holder on the starter battery.
The frontsides of fuse holder and battery monitor. The latter shows the percentage of loading, the voltage and how much power (W) is used or produced. In the fuse box the consumers are to the right, the producers to the left located.
Of course it is a scheme, for the real proportions see the pictures on top. It is about the essence: the battery gives and receives energy, it receives from the solar panel, the battery charger and the alternator through the starting battery, it gives to the lights, the sockets, water pump, heater and refridgerator. For the sake of the organization the plus and minus wires come together in the distribution blocks, that are connected with a thick wire to the plus and minus poles. For the thickness of the wires see the pictures on top. The wires connected with the plus are provided with fuses preventing fire when there is short circuit. The monitor shows the amount of energy that is delivered and received, and the height of the voltage and the percentage of being charged.