Solar Li Ion Battery Charger Circuit

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.

Solar li ion battery charger circuit.

The 3rd idea teaches us how to build a simple solar led with battery charger circuit for illuminating high power led smd lights in the order of 10 watt to 50 watt. 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. The 18650 cells are one of the most prevalent types of lithium ion battery cells. 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.

At the heart of the circuit is one microchip mcp73831 available in sot 23 5 package. In this diy project i will show you how to design and build a simple but effective solar battery charger for 18650 batteries. Using this project you can charge two 18650 li ion batteries directly from solar without any wall adapter. 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. 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. For getting a controlled charging supply.