Step 1: The Goal
I wanted a universal power supply that would come in handy while away from any form of power. I complicated this quite a bit a first but have now posted what I had done when I opened it up to make some changes to the unit.
This unit provides 12v from 3 x7ah batteries and that is used to run the led lighting that we use around the camp site and charge our cell phones and iPads. I installed a 150w inverter into the box too making it more versatile and because I had a little inverter lying around
Step 2: The Beginning
I had an led voltage indicator kit lying around so that was the first thing that was thrown in.
The next was the little inverter that was under my work bench that was never used because it was modified sine wave and only 150w.
I had a few lead acid 7a/h batteries lying around too that had to go in it was just a challenge to see if I could fit 3 of them.