When i switch on my system with 2 multiplus ii 5000/48 in paralell it is heard several times masive huming/buzz(10 sec) then the inverters are synchronized. These appear only when i start the inverters. It is normal?
Yes that is normal (to a certain degree).
There are some big transformers in there and when you first switch on the cores are 'saturating' usually drawing quute a bit of current, and they are synchronising.
Are you starting the system up under load? Usually that makes it worse.
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