FoxESS Community - Owners & Installers Forum

Posted: **Tue Sep 15, 2026 1:20 pm**

I was wondering why last night for two hours the battery wasn't discharged and the power was consumed from the grid.

In the activity log of my Home assistant I can see that my H3 went offgrid for exactly two hours:

Code: Select all

time (UTC)          			entity_id				state
2026-09-14T23:48:15.818Z	sensor.inverter_state	On Grid
2026-09-14T23:47:04.922Z	sensor.inverter_state	Standby
2026-09-14T21:48:15.490Z	sensor.inverter_state	Fault

There is no other indication, the Inverter Fault Code didn't change at all. The parameters R-, S-, T-volt , R-Frequency etc. were still measured and were not outside the valid range.

The connection to home assistant is done by Modbus TCP https://github.com/nathanmarlor/foxess_modbus , direct connection to the gateway.

Versions:

Master: 1.49
Slave: 1.00
Manager: 1.31
AFCI: 0.38
Datalogger: 2.11

Posted: **Tue Sep 15, 2026 2:00 pm**

A bit of a mystery, unless you see something in the HA activity log that occurred before the 1st time stamp.

Fault in FW/Hardware (so doesn't exactly narrow it down!) as you said grid Voltages all seemed ok.
If you can power it all off, then you can check all connections are tight, and this forms a reboot also, so could help.

Seems you might have to play the long game to see what happens in the future. Fox might be able to interrogate the system, and pull some other fault code from another memory area?

FoxESS Community - Owners & Installers Forum

H3-10.0-Smart state "fault" for exactly 2 hours

H3-10.0-Smart state "fault" for exactly 2 hours

Re: H3-10.0-Smart state "fault" for exactly 2 hours