Peacefair Pzem-051 Manual Jun 2026

Ensure the thin Red/Black wires are receiving 6.5–100V DC.

| 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 | peacefair pzem-051 manual

| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | No display | Meter power missing (thin red/black wires) | Provide 5-12V DC to meter’s power input. | | Shows 0V / 0A | Voltage sense wire not connected; shunt wires reversed | Connect thick red to positive load side; check shunt polarity. | | Negative reading | Polarity of shunt or voltage sense is swapped | Reverse the two thin current sense wires. | | Inaccurate current | Shunt mismatch or loose connections | Ensure it’s the included 100A/75mV shunt; tighten large terminals. | | kWh resets randomly | Power loss to meter’s memory circuit | Keep meter powered continuously; some units lose data if main power is cut. | Ensure the thin Red/Black wires are receiving 6

Always confirm labels on your board; manufacturers vary. | | Shows 0V / 0A | Voltage

[ POWER SOURCE / BATTERY ] ( + ) ( - ) | | | +---------+---------+ | | | | [ SHUNT ] | | (In-line) | | / \ | | [Gnd] [Cyan] | | / \ | +------V--V-----------V------------V------+ | Pin 1 | Pin 2 | Pin 3 | Pin 4 | <-- Meter Terminals | Source+| Shunt- | Shunt+ | Source- | +-----------------------------------------+ | [ LOAD ] Pin Configuration

Incorrect wiring will destroy the meter. Follow these connections exactly.