Sometime, we aren't aware or taken for granted that everyday we waste our precious natural resources especially fossil fuel in form of routine used of electricity to power our things.
And I've... used a lot of it to charge my drone.
Now, in a 10 minutes' instructable, you can give a small contribution of saving Mother Earth for the future generation.
This is an instructable of making your own DIY solar battery charger from very simple components.
Step 1: What You'll Need
- Rechargeable battery
- Single battery holder
- Wire connector
- A diode
- 13W Solar panel
Tool : A screw driver
Completion Time : 10 minutes
Where to buy?
Step 2: The Diode Connection
Firstly, I connect the two end of the diode to the wire connectors.
Please make sure that the silver lining on the diode will be attached to the positive terminal of the battery. It will prevent the current from back flow to the solar panel thus, draining the battery that we want to charge.
Step 3: The Holder Connection
It's easy to connect to the battery holder because the wires are in red and black colored (red wire connects to the battery's positive terminal and the black wire connects to the battery's negative terminal).
The red wire is attached the diode directly to the silver lining's end and the black wire is attached to the empty connector slot.
Step 4: The Solar Connection
Next is the solar panel setup.
Matching the colors of the wires, I attach the other end of the diode (not with the silver lining's end) to the red wire of the solar panel. Then, I finish the process by connecting the panel's black wire to the connector slot that previously connected to the battery holder's black wire.
I hope you can complete this 'ible in 10 minutes or dare to break my record!
Step 5: The Charging
Lastly, a step to be a Hero saving Mother Earth.
I plug in a rechargeable battery to the battery holder and bring out the solar battery charger out in the sun to charge the battery.
This is a formula to calculate the amount of time to fully charged the battery.
The solar panel produce about 7.20A.
If you convert it to mA then, 7.20A X 1000 = 7200mA (amps X 1000).
The battery is 2500mAh, and how long it required to fully charged is 2500mAh/7200mA = 0.347 hour.
The conversion of 0.347 hour to minutes is 0.347 X 60 minutes = 20.8 minutes!.
Then, it will be about 21 minutes in the sun for the battery to fully charged.
For an hour, you can charge simultaneously three 2500mAh batteries in a parallel circuit.
(If my calculation is incorrect, please leave a kind comment below).
If you want to charge multiple batteries in a session, you can create a parallel circuit.
(Please refer to the circuit diagrams).
Points of Caution
Since the current is 7200mA and it's too much for a single 2500mAh battery, I suggest that the setup of circuit is a parallel circuit of at least three batteries. However, anything relating in charging a rechargeable battery of any kind must be handle with extreme caution.
This setup will lessen the current load on each battery to be charged and added a load to the circuit, thus less heat generated or else the battery will damaged because of over current.
I tested one of the battery and it register about 6.9 ohm before the charging.
And, please do it outside.
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