Zabezpieczenie przed rozładowaniem akumulatora 12V 24V 8-36V histereza

12V / 24V battery low-voltage protection

A circuit that protects batteries against deep discharge. The device continuously monitors voltage and automatically disconnects the load if it drops below the set value. Designed for batteries with input voltage in the range 8-36V, making it a versatile solution for both 12V and 24V installations.

Key technical specifications

• Input voltage: 8-36V
• Maximum relay contact load: 20A 14VDC / 20A 125VAC
• Voltage measurement accuracy: +/-0.3V
• Dimensions: 57 x 42 x 19 mm
• Built-in display showing current battery voltage

Module setup instructions

Depending on the firmware version, the module can be configured in two ways. Parameters are adjusted using the buttons on the PCB.

Method 1:

• Quick double press of the left button - set battery cutoff voltage
• Quick double press of the right button - set hysteresis (default 2V)
• Hold the right button - set relay reconnection delay time (default 0 minutes, adjustable in 1-minute steps)
• Hold the left button - calibrate voltage display
• Hold both buttons - factory reset

Method 2:

• Short press of the left (+) button - view set cutoff voltage
• Short press of the right (-) button - view set hysteresis in the range 0.1 - 10V
• Long press of the left (+) button - cutoff voltage adjustment mode (value blinks; change with +/- buttons)
• Long press of the right (-) button - hysteresis voltage adjustment mode (value blinks; change with +/- buttons)

Example operation: If cutoff voltage is set to 10V and hysteresis to 3V, the module will disconnect supply when voltage falls below 10V. The relay will reconnect once voltage rises by 3V, i.e. at 13V.

Example applications

• Protecting gel and lead-acid batteries from premature wear
• Emergency power systems and small off-grid photovoltaic installations
• Power management in campers, caravans, and boats
• Protecting batteries in wheelchairs and smaller electric vehicles
• Industrial automation requiring precise control of emergency supply levels

Benefits

• Effective protection of cells from irreversible damage due to excessive discharge
• Significantly extended service life of the batteries in use
• Precise adjustment of cutoff and reconnection parameters for a specific battery type
• Easy reading of current supply status thanks to a clear display
• Wide applicability thanks to the broad supported operating voltage range