Same issue here. Been bashing my head against it for 3 days and not getting anywhere!
2 x 8KW Inverters in parallel, a PI3 and this RS485 converter: https://www.robotics.org.za/RS485-3P
Managed to get a serial number out of the inverter but nothing else - just timeouts. Chopped the RS and USB cable to 30cm just in case - still no joy.
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[s6-init] making user provided files available at /var/run/s6/etc...exited 0.
[s6-init] ensuring user provided files have correct perms...exited 0.
[fix-attrs.d] applying ownership & permissions fixes...
[fix-attrs.d] done.
[cont-init.d] executing container initialization scripts...
[cont-init.d] done.
[services.d] starting services
[services.d] done.
2022-06-10 18:28:10,130 INFO Loading HASS OS configuration
2022-06-10 18:28:10,164 DEBUG could not patch umodbus: numpy not found
2022-06-10 18:28:10,174 INFO Filter *last used for battery_soc, total_battery_charge, total_battery_discharge, total_grid_export, total_grid_import, total_pv_power
2022-06-10 18:28:10,177 INFO Connecting to serial:///dev/ttyUSB0
2022-06-10 18:28:10,301 INFO ############################################################
2022-06-10 18:28:10,302 INFO Inverter serial number 'XXXXXXXXXX'
2022-06-10 18:28:10,302 INFO ############################################################
2022-06-10 18:28:10,304 INFO MQTT: Connecting to user@core-mosquitto:1883
2022-06-10 18:28:14,910 INFO MQTT: Connection successful
2022-06-10 18:28:25,906 ERROR Timeout reading:
2022-06-10 18:28:25,908 INFO Retrying individual sensors: ['Total PV Power:last', 'Total Battery Charge:last', 'Total Battery Discharge:last', 'Total Grid Export:last', 'Total Grid Import:last', 'Battery SOC:last']
2022-06-10 18:28:35,957 ERROR Timeout reading: Total PV Power
2022-06-10 18:28:46,001 ERROR Timeout reading: Total Battery Charge
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Anyone have any ideas? I'm out!