Introduction: Charge Your Shaver From the Sun

Picture of Charge Your Shaver From the Sun

This is an easy to do mod for an electric shaver.

The reason I made this was my so called water proof electric shaver broke due to water getting in to it. And I was unable to charge it due to the charging circuit getting wet and failing.

So instead of buying a new shaver I decided to charge it using an old solar panel I had.

The modification was pretty straight forward.

Step 1: Items Needed

Items needed.

1 solar panel 3 volts
1 diode
Some heat shrink.

Tools needed.

Soldering iron
Multimeter.
Sealant.

Step 2: Wiring the Solar Panel

Picture of Wiring the Solar Panel

The first job I did was to solder 2 wires to my solar panel and check that I would get some volts out when it was in the sun.

I checked this using my multimeter set to volts.

When I was happy there was a voltage I used a little silicone sealant and sealed the contacts to stop moisture getting to them.

Step 3: Connecting the Base Unit to the Solar Panel

Picture of Connecting the Base Unit to the Solar Panel

The next job was to figure out which was the + and - terminals on the base unit.

To do this I just used my multimeter and measured the voltage from the psu plugged in to the wall.

And as you can see I marked the base unit to make it easier to see.

Then I unplugged the wall charger.
Cut the wall chargers lead and wired the positive lead from the solar panel to the positive connector for the base unit.
And wired the negative lead from the solar panel to the negative lead of the base unit.

I sealed the wires using the heat shrink.

Then I checked I had a voltage at the base units contacts.

Step 4: Modifying the Shaver

Picture of Modifying the Shaver

The next job was to open the shaver and find out more about how it worked.

This is done by undoing the torx screws shown.

I was then able to see the batteries.

I lifted the batteries up so that I could get to the contacts and the PCB.

I soldered a diode to the positive terminal that would connect with the positive terminal on the base unit.

Make sure the diode is wired the correct way round. This can be checked with the multimeter. It will only allow current through in one direction.

On the back on the diode I attached a wire to the positive terminal of the battery.
And sleeved it.

Then I connected a wire between the negative charger contact and the negative of the battery as shown.

And reassembled the shaver.

Step 5: Testing

Testing

Testing was just a matter of putting the shaver in the base unit and putting the solar panel in the sun and checking that the voltage was getting to the battery.

Then I just put it back together and that's it.

Now I never have to worry about my shavers battery being flat.

Comments

sam D (author)2011-08-11

Great instructable. I have the same shaver and the contacts are always fouling on the charger with some sort of copper salt.

I suspect there is a diode present in order to stop you from being electrocuted mildly in the shower - that is it lets charge flow into the shaver but not out.

Can;t wait to go home and hack mine!

snotty (author)2010-11-17

I did this a while ago. Mine went through a few iterations.

First I tore out all the charge controller electronics and replaced them with the guts of a solar garden light and the light's solar panel. This worked but the batteries went dead after a few days in the shade.

The second way I tried was with the same solar panel but no charge controller. I simply used a single diode to prevent discharge through the panel and I checked that the panel's amperage was less than 1/10 the bateries' amp/hour capacity.

It worked fine for years until a different part (the foil) wore out and it's really expensive to replace. Now how do I replace the foil cheaply I wonder....

Vissy (author)2010-10-01

There might be a diode in the panel itself, so it doesnt actually drain the battery (just by having a complete circuit) when theres little exposure to the panel. If there isnt one, you may want to add one.

A shadow across a corner can cut a panel's voltamps down considerably, and a shadow across the panel can cause nearly total blockage in the circuit.

Ive made a voltage regulator for my cellphone charger, but we dont get more than 4.4 hours of "solar-usable" light a day here. The regulator uses up about 150mA, and the panel generates only 350mA on average. The wall charger for my phone is 500mA, but i've measured it, and with a dead battery, draws only 300 to 400mA

Thanks!

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