Today we experienced and issue with a Victron Quattro 8kVA, SMA SunnyBoy 4.0 and Himoinsa HYW-9 M5 where the generator would connect however hunt between 48-52Hz fairly quickly, then leading to lights flickering, and charging being unpredictable in output.
The generator was commissioned yesterday and whilst this was observed it was intermittent and we considered that an issue could be occurring where the Victron maybe leading the frequency as it was shifting due to state of charge and then in turn maybe causing an issue. With this in mind we believed the commissioning test conditions were unlikely to re-curr as its not often a generator is run then the solar is doing well.
After a night the customer reported the same fault then de-bunking my theory. After further thought I tried both increasing and decreasing the shore limit settings in the inverter with no success. I then tried a setting in VEConfigure called “Weak AC Signal”, Victron describes this setting as some generators have a waveform that prevents normal charge conditions to work. I actually think what this does is it creates a slightly lagging power factor to ensure the clear return path to the generator. In any event “Eureka”. The generator is sitting almost exactly on synchronous frequency and is also doing so in the day.
I thought I’d write this up as I wouldn’t be surprised if this occurs again and for others and maybe this will help. Just remember these generators are not like the grid and are quite small, it is possible for customer equipment to influence the generators production.