Peacefair Pzem051 Manual Patched Jun 2026

If your board features an accessible STM8S microcontroller, developers in the open-source community utilize tools like an ST-Link V2 programmer along with to patch the chip.

For the shunt, the large terminals accept cables up to 8 mm² (10 AWG) for the 50 A version, or up to 16 mm² (6 AWG) for the 100 A version.

Cut the thin copper trace on the PCB leading to the stock MCU's RX pin. peacefair pzem051 manual patched

The power area displays the current alarm value; short press to increment digits. It switches digit positions automatically after 3 seconds of inactivity. Long press for over 5 seconds to save and exit. Wiring and Installation

Figure 1: Simplified wiring diagram

– Press and hold the button. “SEt” will appear first; continue holding until “CLr” appears on the display, then release.

Use thick, appropriately rated wires for the main power terminals. Use thin, flexible wires exclusively for the modified serial patch lines. To help adapt this to your project, let me know: If your board features an accessible STM8S microcontroller,

The accumulated energy value (Wh / kWh) can be reset to zero at any time.

The PZEM-051 features a high/low voltage alarm. When thresholds are breached, the backlight flashes. The power area displays the current alarm value;

The high and low voltage limits will appear. Short press to increase the digit; long press to move to the next digit.