Peacefair Pzem-051 Manual Jun 2026

The meter requires at least 6.5V to operate. If measuring a source below 6.5V, a separate power supply is required for the meter's logic 0;a9c;.

The external shunt must be connected correctly to the "Current" terminals to measure high amperage safely. en.peacefair.cn 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. | The meter requires at least 6

Short-press the key to toggle the backlight on or off. The device remembers the last state when powered down. Reset Accumulated Energy: | | Inaccurate current | Shunt mismatch or