I experience quite unstable output frequency issues with an older (and repaired) Quattro, where the frequency fluctuates 48.2 to 51.4 Hz - sometimes even more extreme - under normal (non-load, non-battery full etc.) conditions.
Compared to other Quattros, MultiRS etc. we have (and which remain in narrow frequency bands 49,8-50.1) this is significant. Ist that some indication of HW failure, some configuration quirk or what could be the cause?
HW is 2658 FW is 496. I tried to install the PV assistant in the hope it would gain more control over output frequency, but that was completely without effect.
There is a microgrid inverter (old 230W Involar) connected to this Quattro and it keeps shutting off frequently when AC-IN is off. It works well when the Quattro is connected/synced to grid/ac-in.
The problem is not the microinverter itself, the frequency oscillates even when it is detached, it seems the Quattro itself is the cause.
Any guesses what the reasons or how to remedy?
