Build an Inexpensive 12 volt/ 12 amp Modern Digital Solar Charge Controller
This reader-requested solar controller for charging 12 volt lead-acid batteries is very simple to build and will help keep your batteries in tip-topped off shape.
The ReFUSEable Box
This project was built for field troubleshooting and replaces blown fuses until the problem is solved. By dialing in the amperage, you can preset the drop-out point in the place of a fuse (200 mA – 5 amps). It is also known as a programmable relay. It displays the active AC or DC amperage being drawn when in the circuit.