Solderless Lithium Ion Cells Charging using Solar Panels, the things required to build Solderless Lithium Ion Cells Charging using Solar Panels without a charge controller project are
- 18650 Lithium Ion Cells (10 cells)
- A Solar Panel (Minimum 20 watts)
- An Old Power Bank Charging Circuit
- Wires and Aluminium Foil for connectivity
- Mobile Charger with Data Cable
- Crocodile Clips
Each 18650 cells contribute around 4.2v(Max) and 2800mah (I)
Power = V * I = 4.2v * 2800mah = 11.76 watts
Connect all the 18650 cells in parallel so that the current gets summed up to 28000mah with a voltage of 4.2v ( Voltage remains same when connected in parallel)
Refer the above circuit arrangement for circuit connection.
Now connect the overall positive and negative connection to the battery + and battery – in the power bank charging circuit
Take the solar panel and connect its terminals with the mobile chargers plug (with +ve and -ve terminal) using clips.
Then place the solar panel near sunlight and a wait a minute, you can see the led glow in the charging circuit. Now depending upon the wattage of panel, the lithium gets charged up , you can use them for various other projects. In my case, I have used thermacoal and aluminum foils to make it as a charging case so that it would be easier to take out the batteries after it gets charged.