DC 12V Auto Power Switching Module – Battery Failover Board
DC 12V Auto Power Switching Module – Battery Failover Board
DC 12V Automatic Power Switching Module – Battery Failover & Charging Control Board
Keep your DC-powered devices running without interruption. This LOTHYE DC 12V Automatic Power Switching Module intelligently monitors your main power supply and instantly switches over to battery backup the moment power is lost — then seamlessly switches back when mains power is restored. Ideal for security systems, solar setups, UPS applications, and any 12V DC circuit that requires uninterrupted power.
Built with high-quality components and a compact 69 × 48 × 18 mm form factor, this module features two onboard adjustable potentiometers (RP1 & RP2) for precise voltage threshold control, letting you set your own cut-in and cut-out battery voltage levels with ease.
Key Features
- Automatic Failover: Instantly switches from mains to battery power upon power failure; switches back when power is restored
- Adjustable Voltage Thresholds: Set custom turn-on and turn-off battery voltages via dual potentiometers (RP1 & RP2)
- 10A Control Current: Handles up to 10A, suitable for a wide range of 12V DC loads
- Compact & Easy to Install: 69 × 48 × 18 mm body with 61 × 41 mm (4 × Φ3 mm) mounting holes
- Clockwise / Counter-clockwise Tuning: Turn potentiometer clockwise to increase voltage threshold, counter-clockwise to decrease
- Wide Application: Solar systems, backup power circuits, security systems, embedded electronics, and more
- Made in Mainland China
Specifications
| Control Voltage | DC 12V |
| Control Current | 10A |
| Product Size | 69 × 48 × 18 mm (L × W × H) |
| Mounting Size | 61 × 41 mm (4 × Φ3 mm) |
| Brand | LOTHYE |
| Condition | New |
How to Set Voltage Thresholds (Example: Turn ON at <11V, Turn OFF at >13V)
- Input 11V to the BAT terminal; measure pin 5 (CONT) — typically ~5.08V.
- Adjust RP1 so pin 2 (TRIG) reads exactly half of pin 5 (CONT) — i.e., ~2.54V. Relay will activate below this threshold.
- Input 13V to the BAT terminal; measure pin 5 (CONT) again — typically ~5.08V.
- Adjust RP2 so pin 6 (THRES) matches pin 5 (CONT) — i.e., ~5.08V. Relay will deactivate above this threshold.
Tip: Adjust the potentiometers gently and in small increments for the most accurate results. For other voltage values, fine-tune accordingly.
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Frequently Asked Questions
Q: What does the DC 12V automatic power switching module do?
A: This module continuously monitors your primary DC 12V power supply. If the main power fails or drops below your configured threshold, the relay automatically switches the load to battery backup. When mains power is restored, it switches back seamlessly — ensuring uninterrupted operation for your connected devices.
Q: Can I set custom voltage thresholds for the battery switchover?
A: Yes. The board features two adjustable potentiometers — RP1 sets the low-voltage turn-on point and RP2 sets the high-voltage turn-off point. You can configure any turn-on/turn-off voltage pair by following the step-by-step calibration procedure described above.
Q: What is the maximum current this module can handle?
A: The module supports a control current of up to 10A at 12V DC, making it suitable for most small to medium 12V DC loads including security cameras, LED lighting, sensors, and embedded systems.
Q: How is the module mounted or installed?
A: The board has four Φ3 mm mounting holes arranged in a 61 × 41 mm pattern, allowing easy screw-mount installation into enclosures, panels, or project boxes. The compact 69 × 48 × 18 mm size fits neatly in tight spaces.