FoxESS Community - Owners & Installers Forum

Afternoon All,

The other day I had my firmware updated on my KH7 inverter, to take advantage of the additional data made available to home assistant in that version. All seemed well, and I can now get battery cell temps but I've noticed a strange behaviour in the PV load and individual string outputs. Rather than the normal graph I used to get, where the output varied with the sun, but always had at least a small output in daytime, I am seeing the output total and all string outputs drop to zero for a few seconds to a few mins, then pop back up again to where I'd expect. It seems to only happen at lower outputs, up to about 0.6kW total but it didn't do it before the update. I've attached screenshots for the total PV power and PV string 1 (West Panel Array 1) with current and voltage also for PV1 for before and after the issue showed up.
Before update.
Manager 1.28
Slave 1.01
Master 1.34 After Update
Manager 1.37
Slave 1.01
Master 1.41 Close up of issue, this tile showing all arrays. FoxCloud shows no pv output at all for the affected periods.
To me it looks like the inverter is shutting off the panels, as all 3 strings drop to zero at the same time. I know it didn't go dark at the time so I'm lost as to what's happening. Could it be an issue with the update, either with the inverter processes or the data it's logging or is it something I've just haven't seen before and is perfectly normal? O noticed then the power drops, the current and voltage for PV1 no not drop. Either way I'm keen to understand what's happening as it looks from the graph that it's not producing for over half of the time it's affected. I haven't checked the inverter but no errors show up in the status on HA. The values are reading as 0 rather than unavailable, so the numbers seem to be correct.

Any input of or thoughts would be greatly appreciated.

Phil

I've just checked firmware versions and you are on the latest.

Whenever I update my firmware I always do a full system shutdown, power off and restart as the Master upgrade is the only thing that does a restart - whilst this isn't standard Fox operating procedure the more experienced always do - i'd recommend doing the restart and then watch your performance over the next few days.

I'll give that a go, thanks Dave.

Sadly the re-start hasn't helped. I've noticed however that the issue only occurs when the battery is charging from 10 to 15% and the solar is putting out less than 0.4-0.6kW, which seems to be part of it's normal operation one its been used to min SoC. It hits min, then charges to 15%, then uses battery back down to 10% and so on. It didn't seem to occur during forced charge or under solar charge.

Phil