Solar Li Ion Battery Charger Circuit

In this diy project i will show you how to design and build a simple but effective solar battery charger for 18650 batteries.

Solar li ion battery charger circuit.

Introduction the need for sustainable living has led to the increased usage of renewable energy. The 18650 cells are one of the most prevalent types of lithium ion battery cells. 3 solar charger and driver circuit for 10w 20w 30w 50w white high power smd led. After making the circuit we need to test it.

For getting a controlled charging supply. The smd leds are fully safeguarded thermally and from over current using an inexpensive lm 338. 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. 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.

Using this project you can charge two 18650 li ion batteries directly from solar without any wall adapter. 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. 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.