Solar Li Ion Battery Charger Circuit

Described below is the do it yourself project of an inexpensive single cell 1s 3 7v lithium ion li ion battery charger circuit principally designed for the cylindrical 18650 edition.

Solar li ion battery charger circuit.

The above discussed li ion battery solar charger circuit using transistors along with auto cut offs works extremely well for almost any small range solar controller programs for instance for charging cellphone battery packs or other styles of li ion battery packs correctly. At the heart of the circuit is one microchip mcp73831 available in sot 23 5 package. Here is a tried and tested sample circuit of a li ion battery charger that can be used to charge any 3 7v li ion battery using a 5vdc usb solar panel power supply. Insert a 18650 li ion battery to the battery holder now you will see the battery voltage and charging current on meter display rotate the potentiometer knob slowly to adjust the charging current.

In this diy project i will show you how to design and build a simple but effective solar battery charger for 18650 batteries. Introduction the need for sustainable living has led to the increased usage of renewable energy. The smd leds are fully safeguarded thermally and from over current using an inexpensive lm 338. 3 solar charger and driver circuit for 10w 20w 30w 50w white high power smd led.

For getting a controlled charging supply. Using this project you can charge two 18650 li ion batteries directly from solar without any wall adapter. After making the circuit we need to test it.