Solar Lipo Charger (3.7V)

This solar LiPo charger provides intelligent charging for single-cell 3.7V lithium batteries from solar panels or other DC sources. With input reverse polarity protection and LED status indicators, it makes building standalone solar-powered projects simple and safe.

Connect a solar panel (4.4–6V) and a lithium battery to create a complete solar power system for IoT sensors, monitoring devices, or any low-power embedded application.

Key Features

• Intelligent Charging – Designed for single-cell 3.7V lithium batteries
• Reverse Polarity Protection – Prevents damage from incorrect wiring
• LED Status Indicators – Shows charging status at a glance
• Wide Temperature Range – Operates from -40°C to 85°C
• Compact Design – Small module easy to integrate

Specifications

• Input Voltage: 4.4 – 6V
• Max Charging Current: 500mA
• Charging Cutoff: 4.2V
• Operating Temperature: -40°C to 85°C
• Module Size: 33 × 33 × 12mm
• Compatible Battery: 3.7V lithium (single cell)

LED Indicators

• Red Flashing: No battery connected
• Red Solid: Charging
• Green: Charging complete

Ideal For

• Solar-powered IoT projects
• Remote sensors and monitoring
• Portable electronics
• Off-grid embedded systems

Resources

• Wiki Documentation
• Schematic (PDF)