Enhance your solar charging system with this versatile 1A Multi-Function Battery Charger featuring advanced MPPT (Maximum Power Point Tracking) technology for photovoltaic cells. Designed as a complete charging controller, it supports single or multiple lithium-based batteries including Li-ion, LiFePO4, and lithium titanate, ensuring efficient and safe battery management for various solar power applications. Key Features: · **MPPT Solar Charging Controller:** Optimizes the power extraction from solar panels to maximize charging efficiency and battery life. · **Wide Battery Compatibility:** Supports multiple lithium battery types such as Li-ion, LiFePO4, and lithium titanate, making it suitable for diverse energy storage needs. · **Adjustable Output Current:** The default maximum load/output current is 1A, which can be customized by modifying the Rcs resistor value to meet specific charging requirements. · **Voltage Source Functionality:** Can operate as a voltage source when no battery is connected, providing flexibility in power supply applications. · **Automatic Battery Conditioning:** Features automatic recovery and conditioning for deeply discharged batteries, extending battery lifespan and reliability. · **Overvoltage Protection & Auto Recharge:** Ensures safe charging by preventing battery overvoltage and automatically restarting the charging process when necessary. · **Multiple Input and Output Voltage Options:**  - For 9V solar panels: Input DC 9-28V, Output DC 1.2-8V adjustable (selectable voltages include 3.6V, 4.2V, 4.3V, 4.35V, 7.2V)  - For 18V solar panels: Input DC 18-28V, Output DC 1.2-17V adjustable (selectable voltages include 3.6V, 4.2V, 4.3V, 4.35V, 8.4V, 12.6V, 16.8V)  - MPPT Disabled Mode (requires R5 resistor change to 12KΩ, recommended DD28CRTA): Input DC 7-28V, Output DC 1.2-21V adjustable (selectable voltages include 3.6V, 4.2V, 4.3V, 4.35V, 8.4V, 12.6V, 16.8V, 21V) · **LED Charge Status Indicator:** Equipped with a “CR” LED that clearly displays the charging status for easy monitoring. · **Wide Operating Temperature Range:** Reliable performance in harsh environments from -40℃ to +85℃, suitable for various outdoor solar setups. Specifications: · Item Type: Solar Panel MPPT Controller Charging Module · Output Current: Max 1A (adjustable via Rcs resistor) · Input Voltage Range: 7-28V DC (varies by model and MPPT setting) · Output Voltage Range: 1.2-21V DC adjustable · Operating Temperature: -40℃ to +85℃ Package Includes: · 1 x Solar Panel MPPT Controller Charging Module This solar MPPT charging module is an essential component for anyone looking to efficiently charge lithium-based batteries using solar panels. Its adjustable settings, comprehensive protection features, and robust design ensure safe, reliable, and optimized solar energy harvesting and battery management for your renewable energy projects.