How to Access RS485 Data from FoxESS Inverter Even When It’s Off?

[Christian Klima]

Hi everyone,

I need some help regarding data access from my FoxESS T-series inverter. My installer connected the inverter to a CHINT DTSU666 meter using the RS485 interface. I’d like to also use the RS485 data for Home Assistant to monitor energy usage.

Problem:

I understand that RS485 is currently being used for communication between the meter and the inverter.
Is it possible to add a device (like an RS485 to USB or RS485 to TCP/IP converter) to access the data directly without interrupting the existing communication?
Main concern:

What happens when the inverter is turned off? Can I still access the meter’s data through RS485? If not, what setup would I need to ensure continuous access, even when the inverter is offline?
Possible solution:

Would an RS485 splitter or hub work in this scenario? Any recommendations on specific devices or setups?
I’m not a technician, so I’d appreciate simple explanations or diagrams, if possible.

Thanks in advance for your help!

This should help you gather ideas and advice from the FoxESS community. Would you like me to assist in posting it or refine it further?

[Will]

Hello,

When the inverter is offline the meters collected will remain but the values of all the realtime data will show as unavailable until the inverter starts up in the morning which is fine.

The most popular way to read live data is via a modbus to lan or modbus to USB adapter connected to the RS465 pins on the com port.
This is a very popular integration https://github.com/nathanmarlor/foxess_modbus but I'm not sure if it supports t series or not. Worst case you can request the t series to be supported.
Someone has made a T series to Home assistant using an ESP board here https://github.com/assembly12/Foxess-T- ... -Assistant which you can use to help figure out what modbus addresses need to be added to nathan's main project if they're not already supported.