We needed a quick and simple 12V supply for a camping trip, so I whipped up this basic system.

Nothing special, just a lighter socket connector with fuse connected to an existing 38Ah battery. A small 20W amorphous panel can be used short term without a regulator to top up the battery. Note, a regulator should be normally be used but the current is low enough (around 1A) for that battery not to be damaged short term.

With the addition of my little 150W inverter, together with a light and provision for some music we have  small system that’s perfect for a few days away.

The parts for the minimal 12V supply. A battery and box, fused lighter socket and alligator clip

The lighter socket screwed to the battery box (with some  wood inside as bracing)

Showing the inverter plugged into the one socket. The other socket could be used for another device.

A closer view of the double socket

Inside the box showing the alligator clips connecting the socket to the battery. Note the foam packing

The complete setup showing the inverter and light connected to the battery (but without the panel)

We have light – and a power point for the small music system

The system will supply around 15 hours of light and music before the battery needs recharging. With the addition of the 20W panel the system with provide power for the whole trip in summer.