12V 10A Battery Undervoltage Cut-Off and Automatic Charging Protection Module

12V 10A Battery Undervoltage Cut-Off and Automatic Charging Protection Module is an automatic relay-controlled battery low-voltage disconnect (LVD) and charger recovery switch board for 12V lead-acid, AGM, gel, and lithium storage batteries. Featuring dual multi-turn calibration potentiometers and a 10A onboard power relay, it automatically disconnects the load or engages charging when battery voltage drops below your lower threshold, and reconnects the load or stops charging once voltage recovers to your upper threshold.

Key Features:

• Automatic Undervoltage Disconnect & Recovery: Protects 12V batteries from permanent sulfation and deep-discharge damage by cutting off the load when voltage drops below the low-voltage setpoint.
• Dual Adjustable Potentiometers: Independently set both the turn-off (low-voltage cut-off) threshold and the turn-on (recovery/full-charge) hysteresis threshold with ±0.1V precision.
• 10A Onboard Mechanical Relay: Heavy-duty SPDT relay contacts switch up to 10A resistive DC loads or control external battery chargers automatically.
• Visual LED Status Indication: Onboard indicator LED clearly shows whether the load/charging relay is active or in protection cut-off state.
• Screw Terminal Barrier Block: 3-pin screw terminal block allows quick inline wiring between battery, charger, and load without soldering.

Technical Specifications:

• Nominal Battery System Voltage: 12V DC Storage Batteries
• Maximum Relay Load Current: 10A DC
• Voltage Detection Accuracy: ± 0.1V
• Threshold Adjustment: Dual Multi-Turn Trim Potentiometers (RP1 & RP2)
• Quiescent Current: < 10 mA (Relay Off) / ~40 mA (Relay Energized)
• Operating Temperature Range: -20°C to +70°C

Mechanical Specifications:

• PCB Material: FR-4 Double-Sided Fiberglass Board
• Terminals: 3-Pin Barrier Screw Terminal Block
• Mounting: Corner Mounting Holes for Enclosure Installation

Dimensions:

• Length: 60 mm
• Width: 30 mm
• Height: 18 mm
• Weight: ~22 g

Pinout and Wiring:

• Battery Input (VIN+ / GND): Connect to the 12V storage battery positive and negative terminals.
• Load / Charger Output: Connect load or charger through the controlled relay terminal.
• Potentiometer Calibration: Use a regulated adjustable bench power supply to set the exact low-voltage cut-off (e.g., 10.5V) and recovery voltage (e.g., 12.8V/14.4V).

Datasheet Reference:

• Circuit Architecture: Precision Voltage Reference + Dual Window Comparator (LM358/LM393) + 12V 10A SPDT Relay

Commonly Used in:

• 12V Sealed Lead-Acid (SLA), AGM, and Gel Battery Deep-Discharge Protection
• Solar Off-Grid Lighting & DC Load Shedding Controllers
• Automated 12V Battery Float Charger Start/Stop Switches
• Inverter & Backup UPS Battery Lifespan Extenders

Applications:

• Disconnects 12V DC lamps, fans, or routers when a backup battery discharges down to 10.5V, and reconnects them only after solar or mains charging restores the battery above 12.5V.
• Automates an unregulated 12V transformer battery charger to start charging at 11.5V and stop charging at 14.4V.
• Prevents parasitic overnight loads from draining automotive or marine batteries flat.

Equivalent Models:

• 12V Battery Undervoltage Management Module: Compact single-potentiometer 12V 10A low-voltage load disconnect module.
• XH-M603 Charging Control Module 12-24V Storage Lithium Battery Charger Control Switch: Digital LED display 12V–24V programmable charge cutoff relay board.

Package Includes:

• 1 × 12V 10A Battery Undervoltage Cut-Off and Automatic Charging Protection Module