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- This module is mainly used for measuring DC voltage, current, active power, frequency and energy consumption, the module is without display function, the data is read through the RS485 interface.
Specification
Over Voltage Alarm:
- Default High Voltage Threshold: 300V
- Default Low Voltage Threshold: 7V
- Communication Interface: RS485 Interface
- Working Temperature: -20~60℃
- Product Size: Approx. 9*6*2.3cm/3.5*2.4*0.9inch
- Weight: Approx. 77g~287g / 2.7oz~10.1oz
Voltage:
Measuring Range: 0.05-300V (When the test voltage is ＜7V, please use the independent power supply mode)
Resolution: 0.01V
Measurement Accuracy: 1%
Current:
Measuring Range: 0.02-300A (Can be matched with 50A, 100A, 200A, 300A four kinds of shunt)
Resolution: 0.01A
Measurement Accuracy: 1%
Features
1.The current measure range is 50A, 100A, 200A, 300A depend on the external shunt specification.
2.Physical layer use UART to RS485 communication interface, baud rate is 9600, 8 data bits, 2 stop bit, no parity.
3.The application layer use the ModbusRTU protocol to communicate, it only supports function codes such as 0x03, 0x04,0x06, 0x41, 0x42, etc.
4.Voltage threshold can be set, divide into high voltage and low voltage threshold, when the measured voltage exceeds the threshold, it can alarm.
Power:
Measuring Range: 0.2-90kW
Resolution: 0.1W
Measurement Accuracy: 1%
Energy Consumption:
Measuring Range: 0-9999kWh
Resolution: 1Wh
Measurement Accuracy: 1%
Reset Energy: Use Software to Reset
David Valencia
July 14, 2025
Took a bit to figure out, but once I got it up and working I paired this with a "TL to RS485 485 to Serial UART" adapter which sends the data to a ESP32 DevKit device running Tasmota. Tasmota then sends the data to MQTT on Home Assistant for automation/reporting. Note: Tasmota has built in configuration profiles for the PZEM devices... so no coding required!I would highly recommend to get the PZEM that comes with the USB adapter to test/validate your PZEM and shunt configuration works as expected. Without this USB adapter it may be hard to validate the wire setup is correct.This device comes with no software. You can find the software online for your PZEM, but you must run it under Admin mode on Windows to install. If you don't want to download anything you can use the online PZEM tool at https://koshka.ddns.net/pzemweb/v1.1/Also note: all PZEM devices are configured by default for the 100amp shunt. If you don't use the software to change the configured shunt size your reported numbers will be off. For example using the PZEM-017 unchanged with a 50amp shunt will double your numbers reported.
Danielle Self
April 8, 2025
There is no software for this device. I tried the aliexepress link for the software. And seller don’t respond to emails. Don’t waste your money.
Kyle Raglin
November 1, 2024
"Danielle Self" seems unaware that these devices typically don't come with software. They are used by DIY enthusiasts/makers who use software like the "Arduino IDE", ESPHome, Tasmota, or other software they can download on their own, depending on which micro-controller or other device they want to connect it to.
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