An electrical monitoring and test module that can be used to test power, energy, voltage and current, and then displayed on a computer or other terminals. It can store data when power off, and store accumulated energy data before power off. Designed with one-button reset, you can reset energy data by simply pressing one button. The TTL serial port can communicate, read and set parameters with various terminals through the RS232 adapter. PZEM-004T AC communication module, the module is mainly used for measuring AC voltage, current, active power, frequency, power factor and active energy, the module is without display function, the data is read through the TTL interface. Functions: 1. Measurement of voltage (V), current (A), average power (kW), energy (kWh). 2. Energy reset by pressing one button. 3. Data saving after power off (saving accumulated energy data before power off). 4. PC display function (display voltage, current, average power, energy). 5. Serial port communication function (TTL serial port can communicate, read and set parameters with various terminals via USB adapter). Technical data: Measured voltage: 80~260VAC Max Rated Power: 100A/22000W Operating frequency: 45-65Hz Measurement accuracy: 1.0 Dimensions: 7.3 x 3 x 2.3cm / 2.87 x 1.18 x 0.9" Display Format: 1. Power Measurement Range: 0~22kW 0 ~ 10kW, the display format is 0.000 ~ 9.999 10~22kW, display format is 10.00~22.00 2. Energy Measurement Range: 0~9999kWh 0 ~ 10kWh, the display format is 0.000 ~ 9.999 10~100kWh, display format is 10.00~99.99 100~1000kWh, display format is 100.0~999.9 1000~9999kWh and above, display format is 1000~9999 3. Voltage Measurement Range: 80~260VAC The display format is 110.0 ~ 220.0 4. Current Measurement Range: 0~100A The display format is 00.00 ~ 99.99 Useful links: https://manuals.plus/innovatorsguru/ac-communication-module-pzem-004t-v3-0-manual https://esphome.io/components/sensor/pzemac.html https://elecena.pl/product/24049968/pzem-004t-v3-100a-energy-monitor-digital-multifunction-meter-watt-power-volt-amp-current-test-module-modbus 2023-08-21 https://elecena.pl/product/24049968/pzem-004t-v3-100a-energy-monitor-digital-multifunction-meter-watt-power-volt-amp-current-test-module-modbus 2025-10-29