H1-6.0-E-G2 + Elfin EW11 on RS485 causes wallbox communication fault

[ricardofaria]

Hi all,

I have a FoxESS H1-6.0-E-G2 inverter, W6 dongle, ECS2800 batteries and an A7300P1-E-2-WO wallbox.

I installed an Elfin EW11 on inverter RS485 pins 3/4 for Home Assistant using foxess_modbus. The Elfin works fine and HA reads the inverter correctly.

But when the Elfin is powered on, the wallbox shows an external meter / RS485 communication fault and the EV does not charge. If I power off the Elfin, charging works normally again.

So it seems I can have HA monitoring or wallbox charging, but not both.

Has anyone had the same issue or found a solution?

Thanks.

[Will]

Questions to help you:
Could you attach a wiring diagram of your setup?
How is the wallbox and inverter integrated?

[ricardofaria]

Hi Will,

The wallbox and inverter are integrated with RS485 connection following the scheme on the image.

Thanks.
https://imgur.com/a/ad4PSrj

[Will]

ah, i don't think you can have two rs485 clients on one connector. You will want to setup a daisy chain and give each modbus client a unique id

[ricardofaria]

A daisy chain like the one on this image?
https://imgur.com/a/YIh1y9a
When you say each to give each modbus client a unique id, is the wallbox something i can give a unique id? also havent found a way of setting a unique id to the elfin w11 modbus.

By the way on the image you can see on point 5 what foxess support stated regarding connecting wallbox and modbus on RS485 3 and 4 ports in parallel: "We have a mature external protocol that can be provided to, and the 3 and 4 ports are external 485 interfaces that you can connect to in parallel with the charger is ok."

Thanks Will