DIY-Solar Energy USB Phone/Tablet Charger




Introduction: DIY-Solar Energy USB Phone/Tablet Charger

About: I am an Electrical Engineer and making electronics projects, gardening, sketching, blogging, repairing gadgets, tinkering with circuits are my hobbies. Follow my instructable page and youtube for more upcoming…

Solar is a Wide source of energy all around the world. We can make full usage of it with many application including electricity Generation. For that we are pretty familiar with Solar panel. They simply Converts light energy into electrical energy. So i decided to make utlization of this energy in order to charge my Phone or tablet. Also it can be used for run other DC appliances(Low voltage and current) Like LED, Decoration lights etc.

So in this instructable i will show you how to make DIY-Solar Energy USB Phone/Tablet Charger in super easy way.

(The Project is best suitable for those who are beginner with solar panel and some basics electronics. Even Though for everyone because this will charge your phone for Free)

***If you liked my project please CLICK Vote!***

Lets Get Started!

Step 1: Components You Need

Here are the list of components
1. 12v solar panel

2. Zero PCB

3. PCB terminals

4. USB slot

5. Capacitors-10microF*2

6. 7805 Voltage Regulator
> Use can use Dc-Dc buck Converter also

Tools you will need

  • Soldering Iron
  • Dremel tools
  • Glue gun
  • Cutter

Step 2: Modifying Solar Panel

When we buy a Solar panel, at the back side of it we will find two terminal that is one positive and second is negative. We will going to add a terminal at the back side of panel.

Just solder a diode at the pisitive terminal at the panel and then to the PCB terminal. Also connect the negative of panel to the second PCB terminal pin

This will give to ease in use with the system. We now just need to insert the wires and tighten the screw.

Step 3: Prepairing Circuit Module

It uses a very common and simple circuit in order to step down the solar panel to around 5.0v. This voltage is neccesary to charge up the phone.
If you want to know more about voltage regulator IC then reffer to this link

Connect the circuit according to schematic.

Step 4: Preparing the Case for Mounting the Usb Slot and Circuit

I use simple plastic casing laying around in my garage.
Just trim off a slot equal to USB and also two holes opposite to USB slot for input terminal from Solar panel.

Be careful while trimming off the slot. If necessary file it.Insert the USB into place as shown.

Step 5: Soldering

Solder the wire to the USB pins that is outer pins. Middle pins are for the Data connections we need not require to connect anything with them.

Solder the Circuit as per the schematic. Connect the USB to the Circuit as shown. Now we are ready to install them into case.

Warning: Do not harm the USB casing while soldering

Step 6: Assembling Everything

Insert the USB into case properly and glue it.

Trim off the un-neccesary PCB such that it can Fit into our Plastic Case. If needed Add support to USB with the help of piece of paper as i did in photos.

That Green terminal is used to connect to Solar Panel. Glue them all and finally you are done.

Connect the wires as long as you want .

Plug USB cable into slot

Connect to your phone tablet.
Free Charging..:D

Step 7: See What You Have Make!

We have made our simple and Cheap Solar USB charger. It can charge your mobile for free. It will just need SUN to charge your phone and thats absolutely FREE..;)

This marks the end of this instructable.

Hope you liked it.

Please vote for the project and share if you think it was awesome.

Don't forget to follow for more cool projects!!
Fell free to have any query.

Hope you liked my instructable.

***If you liked my project please CLICK Vote! ^ Above ^ ***


Solar Contest 2016

Runner Up in the
Solar Contest 2016

Backyard Contest 2016

Participated in the
Backyard Contest 2016

Maker Olympics Contest 2016

Participated in the
Maker Olympics Contest 2016

Be the First to Share


    • Raspberry Pi Contest

      Raspberry Pi Contest
    • Anything Goes Contest 2021

      Anything Goes Contest 2021
    • Jewelry Challenge

      Jewelry Challenge



    5 years ago

    Very good work and write up. You have my vote!

    kavish laxkar
    kavish laxkar

    Reply 5 years ago

    Thanks a lot..:)


    5 years ago

    hello kavish laxkar

    its a god idea :)

    but success of this device is heavily dependent on the current that can produced by the solar panel .if the solar panel can't produce more than 700 mAh current this device will become useless if solar panel can produce 700mAh you will take 4 to 6 Hr to fully charge a 3000mAh can avoid this by replacing that linear regulator with a buck converter like DC-DC Converter Step Down buck Power Supply Module

    it will convert 12v 700mA to 5v 1A (theoretically)

    kavish laxkar
    kavish laxkar

    Reply 5 years ago

    Hi Vina..:)
    Truely said that the more the current the, more it charge fastly i.e will take less time to fill power. Here i want to show some application of 7805 that can help some beginners to understand what i s all about.

    For better performance Just we can repalce 7805 linear regulator with a buck converter like DC-DC Converter Step Down buck Power Supply Module as you said..:)

    Thanks for knowledge..:)


    5 years ago

    Great idea. Is there any particular reason for not putting the diode on the circuit board (at the other end of the positive wire)? I can understand the need for protection against reverse polarity. Perhaps you placed it on the solar cell to protect it no matter what gets hooked on the other end of the wire, like if you decided to reuse the cell for another project. I know how experimentation works, it is always a "work in progress" as our minds come up with new ideas. Thanks for showing everyone how easy it is to convert the sunlight to usable electricity. Lots of people don't understand the need for regulation of the solar cell output and therefore burn things up and quit experimenting.

    kavish laxkar
    kavish laxkar

    Reply 5 years ago


    Thanks for liking it.:)

    Yes that diode can be put on circuit board too. I just put it on soalr panel because i often use that solar panel in various project and at that time i was only 1 diode left with me so i put it on panel...;) (Now i have tons..:D)

    This will help beginners to have a good Start with such stuffs.