1. Inrush and cutoff thresholds Inrush voltage: 10.5V to 11.5V. Disconnect voltage: 14.4V to 14.8V. How it works: When the battery voltage drops to 10.511.5V, the power control board automatically starts charging. When the voltage rises to 14.414.8V, the board turns off the power. 2. Indicator light During charging, the red indicator light is on. When the battery is fully charged, the relay is closed and the 220V input terminals are cut off, causing the indicator light to go out to save energy. 3. Overcharge prevention and charging target This is a dedicated control board for charging a 12V battery. It provides automatic stop to avoid overcharging once the battery reaches full charge. 4. Wiring and compatibility Wiring method: Connect the 220V line to the COM terminal of the relay, and connect the OFF terminal (output) to the charger. Charger requirement: The charger must use an output mode with a full bridge rectifier. Battery type: Designed for 12V battery charging. Key benefits and why you need it Safe automatic charging: Starts charging only when needed (low battery voltage) and stops at the proper threshold to prevent overcharging. Energy saving: The indicator turns off at full charge to minimize standby energy use. Simple integration: Uses a single relay in the mains line to control the charger, with clear wiring instructions. Compatibility: Optimized for 12V battery charging and standard 220V mains equipment that relies on a charger with full bridge rectification. Typical use scenarios Home battery maintenance: Keep a 12V household battery bank charged automatically, reducing manual monitoring. Automotive or marine 12V systems: Maintain boat, motorcycle, or small vehicle batteries with automatic charge control from mains power. Small offgrid or backup setups: Integrate with a 12V battery bank and a 220V charger to manage charging in emergency power or offgrid configurations where a fullbridge rectifier charger is used. Important notes Ensure the charger connected to the OFF terminal supports full bridge rectification as required. The device is specified for 12V battery charging and relies on 220V mains input via the COM terminal of the relay.