FoxESS Community - Owners & Installers Forum

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.

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

Hi Will,

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

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

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

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