P1 to RS485 converter instead of ET340

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ronbeton asked Mar 22, '23

P1 to RS485 converter instead of ET340

I have a smart grid meter with DSMR v5 so it transmit a p1 telegram every second. I'd like to use this data as grid meter in ESS. In my understanding this is even more accurate then an ET340 which has a refresh rate of 2 seconds.

I'm thinking of the following solution:

I found a p1 to RS485 converter P1MB - P1 to Modbus converter | Xemex
After converting I could use the Victron Zigbee <-> RS485 bridge to transmit over the air
Connect the other end of the Zigbee bridge to my Cerbo.

What do you guys think? Is this feasible?

Energy Meter rs485

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rns commented · May 07, 2023 at 04:47 PM

Hi,

I'm looking for a similar solution. (see my question : https://community.victronenergy.com/questions/203592/p1-port-as-energy-meter-for-multiplus.html)

Did you make progress in this ?

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Modifications Space

Node Red Space

Answer 1 · 2023-03-22T20:37:31Z

pyrorider answered · Mar 22, 2023 at 08:37 PM

I guess you need to use VenusOS on a PI and configure the drivers for your meter as the mapping of the rs485 registers probably is not similar to the one of the ET340 or the ABB B23

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rns commented · Jul 06, 2023 at 07:59 AM

can you help me to finde the drivers. My digital energy meter is installed a few days ago.

I can read al the values with an esp8266 so the P1 port is active. Would be nice to feed this info directly to the victron multiplus II

Now i stear the multiplus via home assistant to compensate on fase1 for fase2 or 3 but the multiplus could do that on his own if he could get the data.

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matt1309 rns commented · Jul 06, 2023 at 08:58 AM

This might be a start if you know python.

dbus-shelly-3em-smartmeter/dbus-shelly-3em-smartmeter.py at main · fabian-lauer/dbus-shelly-3em-smartmeter · GitHub

Can tweak this driver to receive the data from your meter rather than from shelly energy meter. Essentially change the function getShellyData to a function that'll receive data from your meter. And then tidy up/remove other shelly specific functions but this would be a good guide if a driver for your specific meter doesnt exist.

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