Volker

The firmware works well. 👍
Unfortunately, 4 inverters displayed SINGEL after the restart as before. After setting the inverters to 3Px, all parameters were OK again (unlike before). Somehow something has changed here!?

Now to the PV test (winter in north germany, no direct sun!!):
(HYUNDAI SOLAR MODULE HiE-S400VG: Voc = 46.4; Vmpp = 38.6)
1. Test with 5 modules connected in series: 5 * Vmpp = 193 V
a) therefore I chose the 150V version ("PV2 I1", with snow on top): looks good, no more 90V problem after sunrise.
b) a further test with the 120V version showed long interventions of the algorithm with the associated fluctuations in voltage and power
2. With 10 modules in series ("PV I1", the snow on these modules had already been blown away) the voltage and output increased rapidly: no more 90V problem after sunrise.

I will have a look for a few more days and then possibly update all inverters to the 200V version...

Here is a the DSP firmware for the MAXII10k inverter: Version 56.07. Despite the information to the manufacturer, the 90V problem has not been solved! (If the voltage is clamped at 90 V and the solar field is switched off and on the voltage increases and the solar power is now 4 times higher.)
"New" is that when PV power is available, the battery is also charged with some mains power (despite mode solar only): bug or feature?
MAXII10K_DSP_5607.zip

Green: original condition
Blue: SOLAR cable disconnected

I am now very sure, there are actually two fixed clamping states. One is fixed at 90V - here there seems to be no regulation of the MPPTs - and in the second, the voltage fluctuates between 90 and 107 V - here the MPPTs are active. Below 90V no power is generated (see data sheet MPPT range is 90...450V).
It will be sufficient to check if the voltage is between 89.5 and 107V and then add 10V.
This way the intervention in the algorithm would not be so strong.

I have just installed the firmware: only Inverter 3 (156.05 to 356.05).
QVFW
(VERFW:00356.05

Exactly, that's what I intend to do. Been thinking about it....
Thanks to both of you.
I will report back.