I need to multiply by 20

[hnkvhf]

First of all thank you for your work it helped me a lot.

Everything is working as it is supposed to be.
But I need to multiply by 20.
I have the "normal" DTSU666-CT with 100:5 clamps.
I can multiply your sensors x20:

ChintPmSensorEntityDescription(
key="uc",
name="C-phase voltage",
phase_mode_relevant=PHMODE_3P4W,
icon="mdi:sine-wave",
native_unit_of_measurement=UnitOfElectricPotential.VOLT,
device_class=SensorDeviceClass.VOLTAGE,
state_class=SensorStateClass.MEASUREMENT,
entity_registry_enabled_default=True,
value_conversion_function=lambda value: round(value * 0.1, 2), ),

The last line in my case will be:
"value_conversion_function=lambda value: round(value * 2, 2),"

I think it will work this way, do you agree?

I was looking for a global setting for the ct-factor, I couldn't find this,
so if my above proposal will work I'm fine with that.

My setup: DTSU666 connected to;
1 by wire to Foxess T3-series for export_limit
2 by Elfin-EW11A to Home Assistant.

[hnkvhf]

Too bad but my setup is not this easy to do.
Using a foxess inverter which has 2 x rs485 ports, one for communication and one for connecting to a power meter. This is specified in the manual.
The Chint has 1 rs485 port, this is connected to the rs485meter port. If I daisy-chain an Elfin ew11, this will not work at all, the readings for the Chint in Home Assistant turn 'unavailable' and eventually the Foxess inverter will stop working with a 242 error, communication fail (no meter detected).

So I have no free rs485 port on my chint meter. For now I think the foxess inverter needs this wired connection to read feed-in power. I will research further if it's possible to connect both devices with an Elfin-EW11 and use HA to somehow write/upload the feed-in to the inverter, I need this to use Export-limit.

Any advice is really welkom

[lmatula]

You need more Elfin adapter, RS485 can't us more than one master
wire chint -> elfin in server mode
inverter -> elfin in client mode connect to server
HA -> connect elfin server

Elfin can serve 5 client simultaneous.