Assistance needed: Identifying Modbus registers for AC Couple PV production via External Meter (Deye 3-Phase Hybrid)

[ciechomir]

Problem Description:
I am seeking assistance in identifying the correct Modbus registers to read energy production data from an external inverter operating in an AC Coupling configuration with a Deye 3-phase hybrid inverter.
The external inverter is measured by an external meter (Ex-Meter). Although I can see basic grid flow data, I am unable to locate specific registers that provide the instantaneous power and daily energy originating exclusively from this external AC source.

My Configuration:

Inverter: Deye 3-Phase Hybrid (Low Voltage).

Connection: External inverter configured as AC Coupled.

External Meter: Installed and communicating with the Deye (Meter status: ON).

What I have checked so far:
Based on documentation and testing in Home Assistant, the following registers do not directly provide AC Couple production:

0x00A7 – 0x00A9: Grid phase power (shows interaction with the grid, not AC Couple production).

0x00B3: Total Grid Power.

0x0146 (326): Used for toggling meter and AC Coupling modes.

Current Temporary Solution:
I am currently calculating AC Couple production using a template sensor in HA, based on the energy balance.
While the calculations work, they are prone to errors (so-called "spikes") resulting from delays in refreshing individual sensors. I would prefer to read this data directly from the Deye registers, if they exist.

Questions:

Are there specific registers (perhaps in the 0x0200 range or others) that store the power from the external meter / AC Couple?

Does the Deye inverter map the "Active Power" from the external meter to a specific register?

Has anyone managed to extract the "Daily AC Couple Production" value directly from the inverter, without using a Riemann sum integral in Home Assistant?

I would be grateful for any tips or register maps for 3-phase Deye/Sunsynk models in the context of AC Coupling.

[ciechomir]

@Lewa-Reka? any sugestion?

[pawlin]

you could check there
https://kellerza.github.io/sunsynk/reference/definitions#three-phase-inverter-sensor-definitions
https://www.scribd.com/document/849692043/Deye-SUN-Inverter-Modbus-Manual

[ciechomir]

Thanks for the reply. I looked there earlier, but unfortunately, only one AC Couple register is listed, and it's related to frequency :(