V3.80~7 Grid power reduced (keep batteries charged mode)

[Ersus]

3x2 Multiplus 8kVA (S99) parallel setup, house is connected only to the Output.
VM-3P75CT
SmartSolar 450/200
214kWh LFP (7 packs)

Incoming for charging
8.5kW PV power AC
2.3kW PV power DC
21kW Grid power AC

On V3.80~4 Grid keeps nicely appr. 21kW power appr. 30A per phase.
On V3.80~7 Grid charging seems reduce on a phase, for example L2 if L1 & L3 loads are pulling a bit more, it seems related to ~7

In ~4 Grid charging power is untouched, does not matter how loads are shifting.

Example behavior V3.80~4
Grid appr.
L1 30A 7.0kW
L2 30A 7.0kW
L3 30A 7.0kW

Loads
L1 1.1kW
L2 0.6kW
L3 1.3kW

Example behavior V3.80~7
Grid appr.
L1 30A 7.0kW
L2 24A 5.5kW
L3 30A 7.0kW

Loads
L1 1.1kW
L2 0.6kW
L3 1.3kW

[nickdb (Nick)]

This S99 firmware based system, it is grid-attached as per the external ATS requirement for parallel systems?

[Ersus]

Correct

[Ersus]

Here you can see the result of both versions.
After reverting to ~4 grid power stays stable.

[Ersus]

Seems fixed in V3.80~8