These sense the actual voltage.
Data is automatically stored in non-volatile memory when power is turned off. peacefair pzem-051 manual
Placing the shunt on the positive leg. The PZEM-051 is designed for low-side sensing (negative leg). Always put the shunt on the negative return path. These sense the actual voltage
The key differentiator is the . Because the meter cannot handle 100A directly, it uses a 100A/75mV shunt—a precision resistor that creates a tiny voltage drop proportional to current. You must use the included shunt (or an exact 75mV replacement) or your readings will be wildly inaccurate. The PZEM-051 is designed for low-side sensing (negative leg)
Release the button, then short press it again to clear the energy value.
The shunt is placed in series with the load. The meter's sampling terminals connect to the small signal screws on the shunt.