Peacefair Pzem-051 Manual - [hot]
The PZEM-051 is a multifunction DC energy meter manufactured by Peacefair (a subsidiary of the Eastron Group). Unlike its cousin, the PZEM-061 (which measures AC), the circuits.
Displays as 0.0–999.9W under 1kW; displays as 1000–9999W above 1kW.
It sounds like you may have encountered an unusual or unexpected phrase in the manual.
Install the inline on the negative side of the circuit.
The is a compact DC power meter that gained a "cult following" among DIY off-grid enthusiasts because of its high precision—and its notoriously tiny, sometimes confusing instruction manual. 🛠️ The Technical "Plot" peacefair pzem-051 manual
If you need help troubleshooting your specific setup, please let me know:
Key features of the PZEM-051 include:
What are you building (e.g., solar, RV, bench power supply)?
| Parameter | Range | Resolution | Accuracy | | :--- | :--- | :--- | :--- | | | AC 80V – 260V | 0.1V | ±0.5% | | Current | 0 – 100A | 0.01A (0-10A), 0.1A (10-100A) | ±0.5% | | Active Power | 0 – 20kW | 0.1W – 10W | ±0.5% | | Energy | 0 – 9999.9kWh | 0.001kWh – 1kWh | ±0.5% | | Operating Frequency | 45Hz – 65Hz | 0.1Hz | | | Data Interface | TTL Serial (RS485 on some variants) | | | The PZEM-051 is a multifunction DC energy meter
Note: Libraries such as PZEM004Tv30 for Arduino IDE abstract this Modbus complexity, making it very easy to read values.
Install the 100A shunt into the negative line of the circuit. Connect Pin 3 ( Current + ) to the battery side of the shunt. Connect Pin 4 ( Current - ) to the load side of the shunt.
: Loose screw terminal connections creating electrical noise.
| 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 | It sounds like you may have encountered an
Ensure the thin Red/Black wires are receiving 6.5–100V DC.
: Toggles the blue backlight on or off. The device remembers this state when powered down. 2. Reset Accumulative Energy (Wh/kWh)
Yes. The 6.5V to 100V range makes this device ideal for 12V, 24V, 36V, and 48V battery banks, as well as off-grid solar arrays. Do I need the external shunt for small loads under 10A?