I have an off-grid installation with 3 single-phase multiplus in parallel connected to a battery. The frequency of the isolated system can vary depending on the connection and disconnection of different loads on the system (weak grid). The problem is that depending on the rate of change of frequency the multiplus disconnects. I have noticed that if the frequency deviation is faster than approx. 0.1Hz per second (even if it is from 50Hz to 49.7) the multiplus disconnects. For slower changes the multiplus has no problem.
Is there any option which will allow the multiplus to remain connected even if the frequency deviation is not slow as long as the frequency remains within the stipulated limits? I have configured the system for a weak grid and disabled LOM, not sure if there is any other settings that could help?