# 3-phase power consumption measurement

**URL:** <https://discourse.nodered.org/t/3-phase-power-consumption-measurement/68489>\
**Category:** Hardware\
**Created:** [2 October 2022 14:40 UTC](https://discourse.nodered.org/t/3-phase-power-consumption-measurement/68489 "2022-10-02T14:40:38Z")\
**Posts on this page:** 1\
**Showing post:** 163

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**Author:** ![edstobi](https://avatars.discourse-cdn.com/v4/letter/e/aca169/32.png) [@edstobi](https://discourse.nodered.org/u/edstobi)\
**Post date:** [12 December 2022 20:59 UTC](https://discourse.nodered.org/t/3-phase-power-consumption-measurement/68489/163 "2022-12-12T20:59:19Z")

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I have 6 modules connected to one esp.  
The ESP is flashed with espeasy.  
All 6 modules go to the same RX/TX ports of the espeasy.  
The address of the PZEM 004T was assigned via the ESP. The PZEMs are pre-set to address 0. Each PZEM needs a unique address.  
Since I didn't have any BAT in my assortment, I used normal 1N4148 high-speed switching diodes.  
I didn't use a level switch, in many forums you can read that the ESP can handle up to 5 V and the diode also steals something. I left everything at 5 V because the CT817c on the PZEM is designed for 5 V. I poll every 10 seconds. The two diodes on the PZEM then flash almost simultaneously on all modules.  
It has now been running for 40 days without a problem.

 ![schema](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/f/7/f7c2670761f340c68d5e553a92c5dc69bdecb82d.jpeg)

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