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3 phase energy metering

I am looking to upgrade energy monitoring, in order to achieve 2 things:

  • Implement a smooth(er) way of supporting 3-phase installations as well as single phase installations.
  • Ensure monitoring happens by a MID-approved energy meter, in order to fulfill regulatory requirements for tax incentives (in Denmark)


This topic was also discussed in https://openev.freshdesk.com/support/discussions/topics/6000053999 


I expect the monitoring could potentially be handled by an additional SDM630 Modbus V2 MID (https://www.eastroneurope.com/products/view/sdm630modbus), which could be read by the Wifi module, for regulatory requirements.


However, a better solution, and one that would work with the metering functionality in the firmware, would be to drop the existing  Current Measurement Transformer, and instead measure directly through the SDM630.


Does anyone have any thoughts on the viability of this?


Thanks,

/Thomas

 

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4 CommentsSorted by Oldest First

We are working on integrating a revenue grade 3 phase energy metering solution on OpenEVSE to meter single and 3 phase using this chipset:


ATM90E36A

https://www.microchip.com/wwwproducts/en/ATM90E36A


It will not come on the next revision of the board but the next following. Should be ready middle of 2021.

1 person likes this

Hi all, 


Do you have any news of the arrival of this improvement?

Will this be implemented in the EVSE Controller V6 ?


Thank you for your job.


Best regards

I cant speak for OpenEVSE 6, but just to add my approach: I have added Modbus communication to the Gateway (ESP32) board, which connects to an SDM630, allowing for MID-approved metering across 1, 2 or 3 phases. The Gateway board then updates OpenEVSE (through RAPI) once every few seconds with energy/voltage data, meaning I get accurate readings with just the one meter. Reach out to me if you want more info/source: thomasn@vanillapp.com I've then re-written the OpenEVSE energymeter class,

Hi Thomas


Thank you for your reply.


I prefer to use a simpler solution but I keep your precious contact because it is important for me to check the 3 phases.


Thank you again for your solution.

 

 

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