This CN3722-based module is a compact MPPT (Maximum Power Point Tracking) solar charge controller designed to charge 3S (11.1 V nominal) lithium-ion battery packs directly from 12–18 V solar panels. It maximizes energy harvest under varying sunlight conditions and includes onboard protection features for safe multi-cell charging.

Specifications

• Controller IC: CN3722 (MPPT lithium charger)
• Input Voltage: 12 V to 18 V DC (solar panel recommended)
• Charging Voltage: 12.6 V (fixed for 3S Li-ion)
• Charging Current: Up to 2 A (depends on panel and load)
• Battery Type: 3S 11.1 V Li-ion / Li-polymer
• Charging Algorithm: CC/CV with MPPT tracking
• MPPT Efficiency: Up to 96% (typical)
• Protection Features:
  • Overvoltage
  • Overcurrent
  • Overtemperature
  • Reverse polarity
• Status Indicators:
  • Charging (red LED)
  • Fully charged (green LED)

Features

• MPPT algorithm optimizes solar energy harvest under dynamic lighting
• Designed for direct solar panel input—no external regulator required
• Compact footprint for portable and embedded solar charging applications
• Onboard LEDs for charge status indication
• Ideal for solar-powered battery banks, robotics, and outdoor sensor nodes
• Common use cases:
  • Charging 3S 18650 packs from 12–18 V solar panels
  • Solar-powered IoT gateways and telemetry systems
  • Remote weather stations and environmental monitors
  • DIY solar UPS and portable energy kits