Strange Values and effect loading EV

WollyCGN · Thu Apr 16, 2026 4:35 pm

Hi, specialists,

I'm wondering about strange values when loading my car. Here is my setup:
Inverter: H3 12.0E
Version_Master: 1.98
Version_Slave: 1.03
Version_ARM: 1.78
Batterie: EP11 BMS 1.004
Smart Meter: DSU666
Waveshare RS285 to ETH Adapter
Home Aassistant 2026.4.2 + FoxESS Modbus Integration v1.13.6

My values with car connected and Export Control = 60000kWh

My car it connectet to phase "S" only and takes 3,5kW. 2.5kW comes from the Batterie and the remainig 1kW from the grid. Because the batterie is discharged on "S" the Inverter switch also "R" and "T" to discharge.
The result is that I take 1kW from the grid while on the other hand feeding in 5kW.

So I assumed setting Export Control" = 0 will solve this - which doesnt:

So as you can see it got worse.

Also I'm wondering about "CT S" which - for my understanding should be positiv instead of negativ.

Any insights on this?
Thanks a lot.

WollyCGN · Tue Apr 21, 2026 8:19 am

999 visits and no reply.
Found it by myself.
In Display: Settings - On Grid - Balance Mode set 'Balance Load' and 'Logic First' to ENABLED.
Within this setting PV power goes to EV and batterie.

ewild89 · Fri May 15, 2026 10:35 am

We are seeing exactly the same issue on two completely separate installations with identical hardware/setup.

Both systems are using:

FoxESS H3 Pro 15
Master: 1.74
Slave: 1.06
ARM: 1.34
FoxESS EP11
BMS: 1.007

Two different installers/companies independently checked the wiring, CT orientation, and phase mapping, and both concluded that the installation/wiring appears correct.

The symptoms are very similar to what is described here:
* incorrect/unstable balancing behavior
* strange import/export fluctuations

Since this is now reproduced across multiple independent installations, it would be very useful if FoxESS engineering could investigate whether there is a firmware issue affecting H3-Pro-15 units with EP11 batteries.

WollyCGN · Sat May 16, 2026 8:46 am

I can confirm the CT values are correct. After my changes it worked as asumed.
But also I see that the Inverter gets power from grid while exporting on the other hand.
With HASSIO and FOXESS integration you can monitor this behavior.

The screenshot shows importing 40W from grid while exporting 20W.
These values are not high level but somtimes they are.

I expect 0W import if there is enough PV power.
FoxCloud confirms this as well.

In this case the inverter consumes 16W from grid while producing 9.15kW --- WHY?