In order to prevent the battery from slipping, a precisely fitting base plate was cut from chipboard. This has a recess for the battery so that it can no longer slip. Of course, this has to be cut to fit the user's box (if you use another one then me).

The next step was to connect the electricity. All cables were already included in the PV set I used. When using your own cables, please ensure that the cable cross-sections (10 mm) and fuses are suitable (maximum 15 cm away from the battery). I connected the cable to the solar panel first. Plus to plus, minus to minus. Since high currents flow, please tighten them firmly. I have not yet connected the solar panel (this has special quick adapters). Next I connected the battery. A 20A fuse must be installed in the positive cable (included in the PV set). Again, plus to plus, minus to minus. This fuse should not be plugged in! There is a danger of a short circuit.

The230V invertermust not be connected directly to the solar inverter. The 230V inverter must be connected directly to the battery. My inverter came with 2 cables that could not be connected directly. I shortened them, re-crimped them and then connected them directly to the battery. A fuse was also installed directly in the positive cable of the battery.

I connected a standard 12V car socket to the load output of the solar inverter. Here, too, a fuse is built into the socket. Only small consumers should be connected to the 12V output (chargers or smaller 12V consumers such as lights).

After the wiring was done, I lined the inside of the box with wood and connected everything with wood glue. The panel above the battery is only laid on and can be opened for maintenance purposes.

For the final test, the PV panel was connected and the fuses installed. The system switches on automatically. Since I use a wet battery, I have set this in the PV inverter. Therefore, please check your inverter to see which types are supported. I then plugged my laptop into the 12 V socket and checked whether it was charging. If everything works, the cables can still be laid nicely and the battery can be fully charged initially.