Constant Battery discharge on 100% SoC

[dripphone]

Hello,
I notice that there is a quite constant value for battery discharge (from modbus) when the SoC reaches 100%, while there is enough sun (feed-in). Can anyone explain?
Although the SoC does not reduce, I still wonder where this discharge comes from.
It's around 160-190 W.

[dripphone]

Does anyone else notice the same behaviour?

[joeylien]

Hi there,

yes, I have the same behavior. I think it might actually be beneficial to overcome battery inertia wenn high loads suddenly activate in the house?

For that reason, some of my friends configured their batteries (non-Fox) to do exactly that.

Cheers!

[WyndStryke]

Probably the power needed to run the BMS and inverter. Although on mine, the sensor shows much less, more like 15W. Note that on 3-phase systems the inverter will most likely need to consume 3x more power to stay active than on a single-phase system.

Regarding feed-in, on my system (KH7 with EC4300-H4 battery and 1.37 manager firmware) when there is a) abundant solar, and b) the SoC is under 97%, despite the sensors displaying zero battery charge power, the SoC rises by about 1% every 5 hours or so. This seems to correspond with a very slow 60W charge on my system. It's steady and very consistent, to the point that I can predict the SoC rise via an integral helper on invbatpower which adds 60W charge during the feed-in mode.

I also suspect that the sensors show slightly different behaviour depending on the firmware version (for example, the inverter self-consumption might be shown as house load instead).

[dripphone]

Also what I noticed (I assume somehow related) is that the energy counter of the battery cannot be true (Battery Charge/Discharge Total (FoxModbus)).

According to this, my Battery produced more energy during last month than it consumed (charged)