Feature 1 Scope of application: Electric vehicles, car battery charge and discharge monitoring, photovoltaic system power monitoring, etc. 2 Bidirectional detection of current, for users who detect charge and discharge can automatically identify and detect bidirectional current without changing the wiring direction. 3 Power-off memory function, after power-off, can remember the number of AH before power-off, which is convenient for observation and measurement. 4 The time and AH count clear function does not affect the next measurement. 5 The AH number can be filled up without affecting the direct discharge metering. 6 Voltage, current, charging capacity AH number, WH number, time and power are displayed at the same time, and the display information is comprehensive and clear. 7 With output shutdown function key, flexible turn on or off output (requires relay). 8 With overvoltage protection, overcurrent protection, overpower protection, time limit protection, overcharge protection and other protection functions. 9 The current is detected by the Hall sensor, and the current passing through the hole of the sensor can be detected, and the current can be detected in both the forward and reverse directions, which is safe and convenient. Item Type Coulomb Meter Model VAC9010H Current measurement range 0-100A Display resolution 0.1A Voltage measurement range Self-powered (12-90)V, external power supply (0-90)V Current accuracy 3%5-digit Voltage accuracy 2%5-digit Display resolution Voltage 0.01V Capacity 0.01AH Time 0.01H(1min) Measurement rate 5 times / sec Protection type and setting OVP (overvoltage protection) 0.01V-90V OPP (overpower protection) 0.01W9.99KW LOP (undervoltage protection) 0.01V~90V OCP (overcurrent protection) 0.1~100A OAH (overcharge protection) 0.01AH-9999AH OFT (Timeout Protection) 1min-99hour 59min Dimensions (length width height) 79 x 43 x 52mm / 3.1 x 1.7 x 2in Mounting hole opening (mm) 76.5 x 39.2mm / 3 x 1.5in Package List1 x Coulomb Meter1 x Display1 x Wiring WireNoteIn use, the positive and negative poles of the battery should correspond to the positive and negative poles of the "BAT" on the expansion board. Be careful not to reverse.