Solar-Powered Li-ion Battery Charger Circuit Documentation

Summary

This document describes a simple solar-powered battery charging circuit designed to charge a single 18650 Li-ion battery using a solar panel. The circuit uses a TP4056 charging module to manage the charging process, ensuring the battery is charged safely and efficiently. A 5408 Diode is included to prevent reverse current from the battery to the solar panel when the solar panel is not producing power.

Component List

TP4056 - Lithium Battery Charger Module

• Description: A complete constant-current/constant-voltage linear charger for single-cell lithium-ion batteries.
• Pins: OUT-, B-, B+, OUT+, IN-, IN+

5408 Diode - General Purpose Diode

• Description: A diode typically used for rectification and ensuring current flows in a single direction.
• Pins: Cathode, Anode

Solar Panel

• Description: A photovoltaic panel designed to convert sunlight into electrical energy.
• Pins: + (Positive), - (Negative)

18650 Li-ion Battery

• Description: A rechargeable lithium-ion cell commonly used in high-drain applications.
• Pins: + (Positive), - (Negative)

Wiring Details

TP4056 - Lithium Battery Charger Module

• B-: Connected to the negative terminal of the 18650 Li-ion Battery.
• B+: Connected to the positive terminal of the 18650 Li-ion Battery.
• IN-: Connected to the negative terminal of the Solar Panel.
• IN+: Connected to the cathode of the 5408 Diode.

5408 Diode - General Purpose Diode

• Cathode: Connected to the IN+ of the TP4056 Lithium Battery Charger Module.
• Anode: Connected to the positive terminal of the Solar Panel.

Solar Panel

• + (Positive): Connected to the anode of the 5408 Diode.
• - (Negative): Connected to the IN- of the TP4056 Lithium Battery Charger Module.

18650 Li-ion Battery

• + (Positive): Connected to the B+ of the TP4056 Lithium Battery Charger Module.
• - (Negative): Connected to the B- of the TP4056 Lithium Battery Charger Module.

Code Documentation

No microcontroller code is provided or required for this circuit as the TP4056 module handles the charging process autonomously.

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This documentation provides an overview of the circuit components and their connections. The circuit is designed to be simple and does not require any programming or microcontroller intervention. The TP4056 module automatically manages the charging of the 18650 Li-ion battery, making it an efficient solution for solar-powered applications.