FoxESS Community - Owners & Installers Forum

Posted: **Mon Dec 29, 2025 7:25 am**

Hi
I just wondering if the following has been seen before and what I can do to fix.
When charging my battery from the grid during free period, if my house loads are high, my inverters is throttling down my battery charge power to supply the house loads. As I want to charge a ev and battery during the free time, this is a little anoying.
My service lines from the street are 80a. My main breaker is 63a.
I can only see the import power current option and this is currently set to 31.9a.
Last night I changed this to 50a however then received code 27, 26 and 1 errors in the app. I changed it back to 31.9a after seeing this and the errors have not come back.
At the moment, the highest draw from the grid I have seen is 16kw.
Just wondering if anyone has seen this and if there is a fix as I know I should be able to draw more than 16kw from the grid to charge at 15kw and supply the house loads as well

Posted: **Mon Dec 29, 2025 9:26 am**

The errors suggest that the inverter either lost grid connection (did a breaker pop?), or the voltage / frequency went out of range - which is possible if you are drawing a lot of power and the wiring to the house is overhead. 16kW is potentially 70A (or more if volts is lower), which exceeds your main breaker.

The current limit setting is the correct way to approach this, the setting will depend whether the inverter can ‘see’ the load from your EV, it’s normally advisable to keep the EV physically isolated from the house load / inverter so the import current limit is for the house / inverter and not all 3.
If the inverter is showing the EV as house load then the import current limit will be too small at 31.9 as anything over 7kW will stop the inverter from charging but it’s concerning you got the errors which suggest loss of power or below range - all of which suggest you were taking too much power at once.

Posted: **Tue Dec 30, 2025 2:15 am**

Dave Foster wrote: ↑Mon Dec 29, 2025 9:26 am The errors suggest that the inverter either lost grid connection (did a breaker pop?), or the voltage / frequency went out of range - which is possible if you are drawing a lot of power and the wiring to the house is overhead. 16kW is potentially 70A (or more if volts is lower), which exceeds your main breaker.

The current limit setting is the correct way to approach this, the setting will depend whether the inverter can ‘see’ the load from your EV, it’s normally advisable to keep the EV physically isolated from the house load / inverter so the import current limit is for the house / inverter and not all 3.
If the inverter is showing the EV as house load then the import current limit will be too small at 31.9 as anything over 7kW will stop the inverter from charging but it’s concerning you got the errors which suggest loss of power or below range - all of which suggest you were taking too much power at once.

Hi Dave
First of all, thank you very much for taking the time to resond to me. Muchly appreciated.
To respond, no i didnt have any breakers pop when i adjusted the import current. Im no expert but it just appeared as there was no change. I wasnt running the charger and the AC (which is also a large draw about 8kw) at the time. What does concern me is your observation on potential wire overheating. The systm is 3 phase so i thought i should comfortable be able to increase the current.

FoxESS Community - Owners & Installers Forum

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