Solar Li Ion Battery Charger Circuit

The smd leds are fully safeguarded thermally and from over current using an inexpensive lm 338.

Solar li ion battery charger circuit.

After making the circuit we need to test it. 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. In this diy project i will show you how to design and build a simple but effective solar battery charger for 18650 batteries. 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.

The 18650 cells are one of the most prevalent types of lithium ion battery cells. Now the circuit works perfectly so we can move to make a suitable enclosure for this. 3 solar charger and driver circuit for 10w 20w 30w 50w white high power smd led. Using this project you can charge two 18650 li ion batteries directly from solar without any wall adapter.

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. At the heart of the circuit is one microchip mcp73831 available in sot 23 5 package. 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.