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 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.