Description
MPPT Solar Battery Charger Module for 18650 Li-ion / LiPo Cells (SD05CRMA)
This MPPT solar charge controller module is designed for efficiently charging single-cell 3.7V Li-ion / LiPo (18650) batteries using solar panels or limited-current DC sources. Based on the SD05CRMA charging IC, it intelligently adjusts charging current to maximize power extraction from solar panels while ensuring safe and stable battery charging.
With constant current / constant voltage (CC/CV) charging, thermal regulation, deep-discharge recovery, and automatic recharge, this compact module is ideal for solar-powered IoT devices, DIY electronics, portable systems, and low-power battery applications.
Key Features:
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MPPT Charging Technology: Optimizes power usage from solar panels
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1A Max Charging Current: Adjustable via resistor (R1)
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4.2V Regulated Output: Safe charging for 3.7V Li-ion / LiPo cells
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Adaptive Current Control: Automatically matches input power capability
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Deep-Discharge Precharge: Restores over-discharged batteries safely
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CC/CV Charging with Thermal Regulation: Prevents overheating
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Automatic Recharge & Charge Termination (C/10)
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Low-Power Sleep Mode: Activates when input power is removed
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LED Status Indicators: Charging and charge-complete indication
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Ultra-Compact & Lightweight Design
Technical Specifications:
| Specification | Details |
|---|---|
| Item Type | MPPT Solar Battery Charger Module |
| Controller IC | SD05CRMA |
| Supported Battery | 1S Li-ion / LiPo (3.7V nominal) |
| Charging Voltage | 4.2V DC |
| Input Voltage Range | 4.4V – 6V DC |
| Max Charging Current | 1A (adjustable) |
| Charging Method | CC / CV with MPPT |
| Battery Protection | Over-voltage, thermal regulation |
| Charge Termination | C/10 |
| Indicators | CR (Charging), OK (Charged / CV mode) |
| Dimensions | 18 × 10.16 × 2.7 mm |
| Weight | 0.9 g (with pins), 0.6 g (without pins) |
| Pin Options | With pin / Without pin |
Applications:
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Solar-powered IoT devices
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18650 Li-ion battery charging projects
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Portable solar chargers
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DIY electronics and Arduino projects
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Sensor nodes and remote monitoring systems
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Low-power backup battery systems
Precautions:
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Designed only for single-cell (1S) lithium batteries.
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Ensure correct polarity when connecting the battery and input supply.
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Do not exceed the recommended input voltage range.
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Use appropriate wiring for currents up to 1A.
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Avoid exposure to moisture and excessive heat.
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External protection circuit recommended for multi-cell packs.
