FoxESS Community - Owners & Installers Forum

Hi. I have a 6.37 kWp installation and I used to have a FoxESS T6‑G3 inverter and everything worked fine. I decided to upgrade the installation and we installed a FoxESS H3 inverter and 2x EP11 batteries. The electrician routed all the power from the meter directly to the inverter into the EPS input, and from the inverter it goes to the house. Since then I have the following situation: at the beginning it was fine because there was sun and it provided extra energy outside the grid for the peaks. When autumn came and there was no sun, the inverter goes into overload mode every second or third day. The installer tells me that I need to add more PV panels, which is nonsense; FoxESS service told me to balance the loads evenly between phases, but I have already done as much as I reasonably can and it is still the same. An AI, after analysing my settings, suggested that I should reduce MaxImportCur from 32 A to 16 A and enable Peak Shaving. I did that yesterday and then I turned on 2 ovens, a microwave, a kettle and an iron at the same time and everything was great. However, today I got up and saw that firstly, in this mode the inverter does not want to perform forced battery charging, and secondly, what is worse compared to Self‑Use, it does not use the battery to supply power to the house but takes energy from the grid, and only after exceeding 16 A does it start taking from the battery, which defeats the purpose of my investment. What can I do about this? The AI suggested: set Self‑Use again and keep 16 A. I did that, but in this mode I turned on one hob of the induction cooker plus the oven and an electric kettle and after a minute the inverter went into overload.My settings are: Self‑Use, MaxImportCur 16 A, Min SOC on‑grid 30%, Min SOC off‑grid 10%, Min SOC 10%.What else can I do to help myself? I feel helpless because this was done at my request for my elderly parents, and now they have to go and reset the inverter roughly every two days. It is a torment.

Running your whole house off the EPS is not recommended. You should install an ATS/Gateway so you're on the EPS port only when the grid is down.

Remember, your backup loads are 1/3 of the inverter's rating which is why you're seeing the overload.

You mean we have to install eps box and right now there is nothing we can do on inverter/ app?

And in this situation when I will install eps box we will use battery only while offgrid right? We cannot use battery all the time?

Being brutally honest I think I'd find a new installer that knows what they're talking about.

That doesn't at all sound like a suitable installation topology. Also, exercise extreme caution when asking AI agents for advice on things that can burn your house down if done incorrectly.

Ok roger that. Do you think these settings are safe right now?

At this moment I mean

Sorry, I made a mistake in my previous message – my inverter model is P3‑10.0‑SH.My current firmware versions are:Master: 1.36Slave: 1.00Manager: 1.23AFCI: 0.35Today the inverter went into overload with a total load of only 2.05 kW on one phase, while the other two phases were at about 50 W and 100 W. Something seems to be wrong, because this is far below the expected per‑phase limit for this model.

Is it normal that, for example, I have 200 W being discharged from the battery, but the AC phase load shows 0 kW on every phase?Or that at night, when the battery was already at minimum SoC and the load was supplied only from the grid, I had 1.52 kW consumption, while the AC phase load was 0.852 kW on the first phase, −0.449 kW on the second and −0.368 kW on the third?This does not add up algebraically for me, and I do not understand why two phases are negative and one is positive.


Could you please help me understand what to check here and whether this is normal?