12V–36V Battery Discharge Protection Module — Automatic cut-off and reconnection for total peace of mind
A fully drained battery often never returns to its original capacity. Whether you’re using a campervan, boat, off-grid solar setup, or a vehicle left standing for long periods, deep discharge damage usually goes unnoticed until it’s too late. This deep discharge protection module steps in before damage occurs: it automatically disconnects your appliances when the voltage drops below your set threshold and reconnects them once power is restored, all without you needing to be there.
Note: This device does not regulate or transform voltage; the output voltage is identical to the input voltage. The maximum supported current is 10A.
Why choose this model? (Key Advantages):
- Fully automatic cut-off and reconnection — The Auto Power-Off and Auto Reconnect functions operate without manual intervention; perfect for systems left unattended for days at a time.
- 0.1V precision adjustment — Set exact thresholds like 11.5V or 22.8V rather than relying on approximations; essential for LiFePO4 and Li-Ion batteries with narrow voltage windows.
- Native compatibility with 12V, 24V, and 36V DC — One versatile module works across car batteries, solar storage, or Li-Ion packs without any hardware modifications.
- Configurable hysteresis — Prevent rapid switching cycles that can wear out the relay; set the exact reactivation differential your system requires.
- Low power consumption — Draws less than 1.5W, ensuring the module itself doesn’t drain your battery.
Details and Performance
The discharge protection module uses a heavy-duty power relay controlled by a dedicated microcontroller that monitors the voltage at the VIN terminal in real-time. When the voltage dips below your preset cut-off threshold (with 0.1V precision), the relay opens the circuit, immediately disconnecting the load connected to the VOUT terminal. Automatic reconnection occurs once the voltage exceeds the sum of the cut-off threshold and the configured hysteresis differential, preventing rapid on/off cycling. With a maximum current capacity of 10A, it is suitable for a wide range of applications, including DC motors, LED strips, charge controllers, and lighting systems.
| Parameter | Value / Detail |
|---|---|
| Input Voltage | 12V – 36V DC |
| Output Voltage | Equal to input voltage |
| Maximum Current | 10A |
| Voltage Control Precision | 0.1V |
| Power Consumption | Max. 1.5W |
| Dimensions | 57 × 42 × 19 mm |
| Weight | 28g |
| System Compatibility | 12V, 24V, 36V DC |
| Applications | Automotive, solar panels, battery banks, DC systems |
Programming and Usage Instructions
- Connect the positive and negative terminals of your battery to the VIN terminal of the module (ensure correct polarity).
- Connect your load (motor, light, controller, etc.) to the VOUT terminal.
- Press and hold the left button to enter the cut-off voltage setting mode — use short presses to adjust to your desired value (e.g., 11.5V for a 12V battery).
- Press and hold the right button to set the hysteresis differential (the additional voltage required for reconnection, e.g., 1V).
- Confirm your settings — the relay will automatically disconnect the load when the voltage drops below the threshold and reconnect it once the voltage returns to an optimal level.
Package Contents
- 1x 12V–36V 10A Battery Discharge Protection Module
Frequently Asked Questions
Is it compatible with LiFePO4 and Li-Ion batteries?
Yes, the module is compatible with any rechargeable battery type with a nominal voltage between 12V and 36V, including LiFePO4, Li-Ion, AGM, and lead-acid, as the protection threshold is manually set with 0.1V precision.
Can it be used for off-grid solar panels?
Yes, it is ideal for off-grid photovoltaic systems. It protects your solar battery from deep discharge when energy production is insufficient to meet the system’s power demands.
What happens if the load current exceeds 10A?
Exceeding the 10A maximum current may damage the internal relay. For high-current loads, we recommend using an external power relay controlled by the module’s output signal.
Does the module work at 24V or 36V without modifications?
Yes, the module natively accepts input voltages between 12V and 36V DC. No hardware modifications are required—simply reconfigure the cut-off threshold to match the nominal voltage of your battery.
Are settings saved after a power failure?
Yes, the programmed values for cut-off voltage and hysteresis are stored in the module’s non-volatile memory and remain active after any power interruption.
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