Universal relay module for controlling and monitoring the charge of all types of batteries
Distinctive features of the module are:
Measurement / control range 0-50V.
Current control up to 5 A
Measurement Accuracy 0.04V
The ability to turn off the display
Supply voltage DC 11-13V

Settings:
The display shows the current measured voltage;
Continuously (more than 1 second) press the first K1 button
The indication blinks: "P-1": change of the K2 mode - plus, K3 - minus
Press K1 a second time, the screen blinks to adjust V1, press K2 to increase and K3 to decrease V1
Press K1 a third time, the screen blinks to adjust V2, press K2 to increase and K3 to decrease V2
Press K1 a fourth time, the current voltage will be displayed on the screen, the device will remember the settings and enter standby / operation mode
In standby mode, press K4, the display will turn off - this function may be useful to reduce consumption or otherwise.

Operating modes:
P-1: charge control: when the measurement is lower than V1, the relay turns on and the voltage is higher than V2, the relay turns off;
P-2: discharge monitoring: when the measurement is higher than V2, the relay is on and the voltage is lower than V1 the relay is off;
P-3: fixed interval - off: when the measured voltage between V1 and V2, the relay is off, otherwise the relay is on;
P-4: fixed interval - on: when the measured voltage is between V1 and V2, the relay turns on, otherwise the relay is off;
P-5: fixed point: when the measured voltage is higher than V1, the relay turns on; when the measured voltage is lower than V1, the relay is turned off;
P-6: blocking: when the measured voltage is higher than V1, the relay turns on and does not turn off. Disabling the relay is possible only when the power is turned off, after which the device is ready for re-monitoring;
P-7: monitoring the passage of a certain voltage: when the measured voltage is V1 (within 0.02V), the relay briefly turns on 1C