The PZEM-004T V 4.0 is a compact and highly accurate AC single-phase energy monitoring module designed to measure essential electrical parameters such as
 voltage, current, active power, frequency, power factor, and energy consumption.
 
Ideal for integration into smart energy projects, IoT systems, and industrial automation, this module supports Modbus RTU communication over TTL for seamless data acquisition and remote monitoring.
The new version v 4.0 supports 3.3v operation. So you can connect with ESP32 directly without any level shifters.
 
Technical Specifications:
Model: PZEM-004T (V 4.0)
Voltage:
Range: 80V to 260V AC
Resolution: 0.1V
Current:
Range: 0A to 10A
Starting Measurement: 0.01A
Resolution: 0.001A
Active Power:
Range: 0W to 2300W
Starting Power: 0.4W
Resolution: 0.1W
Power Factor:
Range: 0.00 to 1.00
Resolution: 0.01
Frequency:
Range: 45Hz to 65Hz
Resolution: 0.1Hz
Active Energy (kWh):
Range: 0 to 9999.99 kWh
Resolution: 1 Wh