question

pfloryann avatar image
pfloryann asked

Massive huming/buzz when switch on

Hi,

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?

multiplus in parallel
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1 Answer
Alexandra avatar image
Alexandra answered ·

@pfloryann

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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pfloryann avatar image pfloryann commented ·
No the system is not under load when i starting. Thank you for answer!
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pfloryann avatar image pfloryann commented · 
do you think that if you use it Ac ignore with start stop generator end user flag when it connects to the grid again it will make that sound? I try to stop feed-in.
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