Solar Powered Hand Tools
is a really cool project. First of all you will need to have a 12 volt dc or
as a Solar Panel setup with a 12 volt battery. You will also need at least
one VersaPak Cordless Tool with charger from Black & Decker. It must be the
kind that has a charger cradle with the power pack (transformer) wired separate
from the charger. I've noticed that a lot of the new VersaPak Tools come with
a new style charger that just plugs into the wall, we want the old style that
has a cord. Like in the picture .|
Note:It must say VersaPak on the tool, Black & Decker also makes another line of cordless tools, we don't want those!
Now get your VersaPak Charger and splice the wires, then strip some insulation off both wires on the cord. You need to find out which wire is Positiveand which wire isNegative, mark both wires with a piece of tape. Cut the transformer off the cord and leave some cord to work with.
The transformer puts out 7.6 volts dc. Our 7808 regulator puts out 8 volts dc, we want it to be a little higher than the battery voltage so that we get a full charge. Now look at the back of the package that the 7808 came in for wiring instructions. Take the cord from the VersaPak charger and solder it to the 7808 with the negative wire to ground. Solder the positive wire to the 7808 output. From the car battery, take a negative wire and solder it to the ground on the 7808 (you will already have one lead from the VersaPak cord soldered to the same spot). Take a positive wire from the car battery and solder it to the input lead of the 7808. You can put up to 36 volts dc into the 7808 and it will always put out 8 volts dc. Look at the diagram below, it is easier then it sounds!
By: Steve Lucas|
Feel free to make copies.