During forced charge I have previously been able to charge at 11kW. Maximun of 10kW from grid and the rest from PV. Today it is only charging at 8.5kW.
Anyone have any clues wny?
Yesterday it was working as expected.
However today the charging is being capped at just below 8.5kW.
If nothing had changed (firmware, inverter settings), my first thought would usually go to battery temperature - as it falls past 21C they will start to derate approx 5A at each 5C incremental step (starts 25A), but as they charge they will warm and you would normally expect to see them start to recover again after an hour but I can't see that on your trace.
If not temperature it's the usual candidates to check in your inverter settings, ImportLimitPwr and ImportLimitCur (under on-grid, Export Control), and also under Battery there is MaxChargeCur which you would normally expect to be set at 40 or 50A depending on the inverter.
If not temperature it's the usual candidates to check in your inverter settings, ImportLimitPwr and ImportLimitCur (under on-grid, Export Control), and also under Battery there is MaxChargeCur which you would normally expect to be set at 40 or 50A depending on the inverter.
I have checked all of my settings and nothing has changed from the previous day. Does the battery provide a reading of it's temperature? The outside temperature seemed similar to the previous day so not sure that would explain it either. There now seems to be a set power limit based on the SOC.
At 11am when the forced charged period started the SOC was at 32% and the charging power was being throttled at around 8.43kW. At 11:52 the SOC reached 52% and the charging power stepped up to 11kW. At 12:52 the SOC reached 80% and the charging power was throttled at 6.38kW. At 13:32 the SOC reached 90% and the charging power was throttled at 4.25kW.
I've colded days previously and have not seen this throttling before. I'll check again today to see if this is now the way the battery charges.
At 11am when the forced charged period started the SOC was at 32% and the charging power was being throttled at around 8.43kW. At 11:52 the SOC reached 52% and the charging power stepped up to 11kW. At 12:52 the SOC reached 80% and the charging power was throttled at 6.38kW. At 13:32 the SOC reached 90% and the charging power was throttled at 4.25kW.
Thanks for the hint.MaterialBarracuda48 wrote: ↑Sun Apr 19, 2026 11:00 pm Look for your filter, and then find your battery cell temp min
Filter.png
At 11am the battery temperature was 21.3C and steadily increased during the charging period so according the post from @Dave Foster would not expect any throttling of the charing rate during that time.
Have a look at this page from a colleague of mine, https://github.com/TonyM1958/HA-FoxESS ... emperature - the battery temperature is SOC dependent and what you are seeing sounds similar to this.
The chart was based on something published by Fox and is our interpretation of the current logic in the BMS (but possibly gets changed from time to time), one thing we have seen is that rather than 20C as stated by Fox, it is actually temp (+1C) so the initial protection steps in when the lowest cell temp is at 21C, the next at 16C - but as you can see from the chart SOC also plays it’s part.
The chart was based on something published by Fox and is our interpretation of the current logic in the BMS (but possibly gets changed from time to time), one thing we have seen is that rather than 20C as stated by Fox, it is actually temp (+1C) so the initial protection steps in when the lowest cell temp is at 21C, the next at 16C - but as you can see from the chart SOC also plays it’s part.
Can you check again for the date in question, and filter for the following
You should see the Bat Min Cell Temp is much lower (sorry I forgot the correct full name yesterday)
You will be able to see that the Battery Temp is much higher, as this is reading the BMS circuit inside, and the Cell Temps are much lower.
The lower line of Min Cell Temp is the one that is controlling your charge rate.
With my EP11 (1.011 FW) on a KH7 Inverter (Current based on the Battery Voltage nominal of 384V)
5.5 Amps up to 10.9°C
10.0 Amps from 11°C to 15.9°C
13.0 Amps from 16°C to 20.9°C
18.0 Amps above 21°C
You should see the Bat Min Cell Temp is much lower (sorry I forgot the correct full name yesterday)
You will be able to see that the Battery Temp is much higher, as this is reading the BMS circuit inside, and the Cell Temps are much lower.
The lower line of Min Cell Temp is the one that is controlling your charge rate.
With my EP11 (1.011 FW) on a KH7 Inverter (Current based on the Battery Voltage nominal of 384V)
5.5 Amps up to 10.9°C
10.0 Amps from 11°C to 15.9°C
13.0 Amps from 16°C to 20.9°C
18.0 Amps above 21°C