Ensure correct DC polarity for measurement. This meter is strictly for DC systems only; do not connect to AC power.
Displays as 0–9999Wh under 10kWh; displays as 10–9999kWh above 10kWh. Voltage (6.5 to 100V): Displays as 6.50–99.99V. Current (0 to 100A): Displays as 0.00–99.99A. Wiring Diagram and Connection Steps
: Press and hold the button until the power area displays SET . Release the button.
| Symptom | Manual’s Solution | Real-world Fix | | :--- | :--- | :--- | | No display | Check Aux power polarity | Aux power needs higher voltage than measured line if using single supply | | Current reads 0.00 | Shunt disconnected | Verify 75mV rating matches meter (50A shunt = 75mV output) | | Erratic readings | Loose sense wires | Solder sense wires directly; do not use terminal blocks |
Wire Pin 2 ( V- ) to the negative terminal of your DC power supply. : peacefair pzem-051 manual
The blue "donut" transformer (split-core current transformer) must be clamped around the of the circuit you wish to measure.
Note: You must match this digital setting to the physical hardware shunt rating connected to the meter. Wiring Diagram and Connection Layout
Short press the button to toggle between the two options. Step 4: Press and hold the button to save the setting. Safety Precautions and Troubleshooting
18;write_to_target_document7;default18;write_to_target_document1a;_Qn3uaYrfAtKLwbkPgMu7mQs_20;1e37;0;4c43; Ensure correct DC polarity for measurement
| Specification | Details | | :--- | :--- | | | Peacefair | | Working Voltage | DC 6.5 ~ 100V | | Test Current (Rated) | 20A / 50A / 100A (Requires External Shunt) | | Measurement Accuracy | Class 1.0 | | Voltage Accuracy | ±1% | | Operating Temperature | -10°C to 60°C | | Dimensions (Main Body) | Approx. 89.6 x 49.6 x 24.4 mm | | Shunt Included (Typical) | 50A/75mV or 100A/75mV | | Energy Measurement Range | 0 ~ 9999kWh | | Power Measurement Range | 0 ~ 10kW |
Press and hold the button for 3 seconds to save your selection and return to the normal display interface. Wiring and Installation Diagrams
Press and hold the button until the power display area flashes "CLr". Step 2: Release the button.
Note: Some models require you to short two specific pins on the back to reset. If the button hold doesn't work, check your specific revision. Voltage (6
The PZEM-051 is designed strictly for Direct Current (DC) circuits. Do not connect it to Alternating Current (AC) power sources. : DC 6.5V to 100V
Your shunt wires on Pin 3 and Pin 4 are likely reversed. Swap the physical connections on the shunt terminals to correct the current flow direction. Why does the screen flash continuously?
For hobbyists and makers who wish to log data from the standard PZEM-051, there is a popular community-driven solution. The meter's internal communication between the main microcontroller unit (MCU) and its TM1621B LCD controller uses SPI. By accessing test points on the PCB (often labeled T1 for CS_PIN, T2 for CLK_PIN, T3 for DATA_PIN), an external microcontroller like an Arduino or ESP32 can intercept and decode this communication to read voltage, current, power, and energy.
Use the 051 for permanent installations where accuracy is critical (solar charge controllers). Use the 061 for temporary or automotive use.