XH-M604 Charging Control Module

The XH-M604 Charging Control Module is a battery charging controller that is commonly used for automated charging of 12V lead-acid batteries (AGM, GEL, SLA, etc.). It's a small, affordable module that cuts off the charger automatically when the battery is full and resumes charging when the voltage drops.

🔌 Key Features:

• Operating voltage: 12V (typically supports 10V to 15V range)
• Load capacity: Up to 20A relay output (though it's safer to stay under ~10A unless using external relays)
• Display: Digital voltage display (3-digit LED)
• Adjustable cut-off & restart voltages:
  • Stop voltage (battery full)
  • Start voltage (battery low)

⚙️ Working Principle:

1. Connect your 12V power source (like a charger or solar panel) to the input.
2. Connect the battery to the output terminals.
3. Set voltage thresholds:
   • The relay turns off (disconnects charger) when the battery reaches the "stop" voltage.
   • The relay turns on (starts charging) when it drops to the "start" voltage.

This avoids overcharging and helps prolong battery life.

🔧 How to Set the Voltages:

1. Hold the SET button for a few seconds until the display blinks.
2. Press SET briefly to toggle between:
   • P0: Stop voltage (battery full)
   • P1: Start voltage (battery low)
3. Use UP/DOWN buttons to adjust each.
4. Hold SET again to save.

🪛 Wiring:

• VCC: Connect to the positive terminal of your 12V charger
• GND: Connect to charger ground
• Relay output: One side to charger’s + output, the other side to battery + terminal
• Battery negative goes to ground directly

✅ Use Cases:

• Solar-powered battery charging
• DIY battery backup systems
• 12V car batteries
• Small 12V UPS systems