For one of our projects, we are looking for an energy meter that is compatible with an existing Cerbo GX device.
Due to structural constraints, we need to measure two conductors per phase (each phase has two wires with a cross-section of 240 mm²).
To simplify installation, we are planning to use Rogowski coils in combination with a Carlo Gavazzi EM530DINRG53XS1X energy meter.
Could you please confirm whether this solution is compatible with the Cerbo GX?
I read the meter selection guidelines; however, according to information from Carlo Gavazzi’s sales team,this specific energy meter is relatively new to the market.
I have several EM530s (EM530DINAV53XS1X) talking to my Cerbo GX, but I’m just using standard split-core CTs.
Both the EM540 and EM530 are fully supported by Victron using the fast update rate with this part number.
The programming of the EM530 is the critical part. I believe the EM530 can only measure up to 10 kA (Ratio 2000).
The turns ratio is the critical setting in the EM530.
For example, for my CTs, the setting is 40:1 because they are rated 200A (200A/5A is 40).
EDIT: Wait, I see they have a different EM530 version for Rogowski (your part number isn’t the same as mine, these are 100 mA/1000 A). So maybe the Cerbo GX will not recognize it. OK, you’ll have to ask Victron.
I would definitely try Carlo again, they should be able to help you. They sell Rogowski coils on the page above.
else if (mDeviceType >= 1744 && mDeviceType <= 1763) setProtocolType(Em540Protocol);
So they accept all Gavazzi device codes from 1744 to 1763 inclusive.
The RG model is 2096, so they would have to modify their code to support this model.
The Cerbo GX will not recognize it. You should confirm this with Victron.
I’m impressed — you’re really deep into the subject.
Thank you for the research. I’ve just emailed Victron about it as well; let’s see what they can do.
I recommend you post a new thread in the Modifications section asking this.
I have not done this level of customization with VenusOS, but others here have.
I think you will need to recompile the dbus-cgwacs code and put it in /opt/victronenergy/dbus-cgwacs.
else if (mDeviceType >= 1744 && mDeviceType <= 1763)
It looks like Victron added the support for the EM530 with Rogowski Coil Support (RG Model)
Announcement for VenusOS 3.73:
MAY 19th, 2026
Released today, Venus OS v3.73 adds support for several new products, including the VM-3P5A energy meter, new Carlo Gavazzi EM530-series meters, and Mopeka Pro-200B and Garnet SeeLeveL SOUL and 709-BTP7 Bluetooth tank sensors, along with various fixes and improvements.
Key changes
** Add support for the VM-3P5A energy meter.*
**** Add support for the Carlo Gavazzi EM530-RG and EM530-MV meters.***
** Add support for the Mopeka Pro-200B and Garnet SeeLeveL SOUL and 709-BTP7 Bluetooth tank sensors.*
** Fix a bug in DESS causing the Multi RS to throttle solar when charging from the grid.*
