Had a system installed in February. Everything going well until the past week or so when the inverter has just started doing stupid things. For example, yesterday it was in self-use work mode, max SoC 100% min SoC 10%. The sun was shining, generating 2.5kW, and battery was charging. When battery reached exactly 60%, inverter decided to hold charge and export the rest. Kept on 60% until the sun went down, discharged naturally to 32% by mid-afternoon. At which point the inverter decided to start charging the battery from the grid.
Contacted the installer yesterday and they said they were seeing a lot of this with the latest firmware updates. They also said they have "updated your app at our end", which seems unlikely. I also don't see any recent firmware updates in the history.
Contacted the installer yesterday and they said they were seeing a lot of this with the latest firmware updates. They also said they have "updated your app at our end", which seems unlikely. I also don't see any recent firmware updates in the history.
This has now happened again; I remembered to check the foxesscloud web site this time and found the battery status was "offline":
(Scratch that, I had reset the inverter and the cloud site hadn't caught up. It's now "idle".)
Battery current flatlined:
What's similar between yesterday and November 22nd is that the outside temperature fell below -3. Too cold for the batteries to operate? 
Battery current flatlined:
If you are thinking it is temperature related, then post up your temperature of the battery.
What battery do you have, is it inside/outside/garage for example.
Do you use Fox Schedulers via App/Website or are you using Home Assistant to program.
Provide images of your scheduler if you can.
Odds are this is temperature related, but need more evidence.
What battery do you have, is it inside/outside/garage for example.
Do you use Fox Schedulers via App/Website or are you using Home Assistant to program.
Provide images of your scheduler if you can.
Odds are this is temperature related, but need more evidence.
Now I know the battery goes into hibernation when it's too cold that does seem to explain everything. You'd think the inverter or battery would log some kind of state code when this happened but OK...
I've got an EP11 (no heater) mounted on an external wall, no cabinet. Programming via HA -> Predbat -> Modbus. Here's battery temp and power for the past few days:
Charging does seem to be limited to 0.8kW when the temperature has got below 17C, and it's disabled altogether now temperature is 15C. Tracks pretty well with this thread.
Time to think about building it a little house.
I've got an EP11 (no heater) mounted on an external wall, no cabinet. Programming via HA -> Predbat -> Modbus. Here's battery temp and power for the past few days:
Time to think about building it a little house.
You are taking the wrong temperature readings, the value you are posting is for the BMS module that is always nice and warm.
You need to track BMS Cell Temp Low value (15.1C) as seen here. If you can repost up image again of this value.
Given you have EP11 non-heated on exterior wall, you will need to build a surround for it that has some insulating properties. Do allow either a ventilation gap that you can open/close in warmer times, or have it so it can be removed for Spring->Autumn.
You need to track BMS Cell Temp Low value (15.1C) as seen here. If you can repost up image again of this value.
Bingo!
Well at least you know why it has stopped taking power, or at a reduced rate.
At those temps, you might see a forced charge from grid, a sort of self-protection mode, you will see that in your logs no doubt.
Time as you say, to build a little home for it.
Well at least you know why it has stopped taking power, or at a reduced rate.
At those temps, you might see a forced charge from grid, a sort of self-protection mode, you will see that in your logs no doubt.
Time as you say, to build a little home for it.