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Generator - variable output frequency issue

I have an issue with the AC output on an off grid system - 10 Kva quattro / 2 x 13.8 Kwh BYD / 6 Kwp DC coupled PV with a Stephill geni (approx 12 Kva). There seems to be a "wobble" in the frequency of the AC out when the transfere switch operates. This seems to be most prevalent on generator shut-down and causes issues with electronic equipment on the AC side of the installation. I have tried the usual "tweeks", any advice as to how I can clean up the output to prevent this .. nic equipment installed.

Generatorfrequency
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Daniël Boekel (Victron Energy Staff) avatar image
Daniël Boekel (Victron Energy Staff) answered ·

Hi @ian@solarplants

the trick is probably to set the minimum AC-voltage higer, as described in the manual:

https://www.victronenergy.com/live/multiplus_faq#minimum_voltage_levels

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ian avatar image ian commented ·

Hi Daniel, thanks for your response.

I have disallowed except wide range of frequency (45-65 Hz)

and set the minimum AC voltage from 180V to 210V but the output is still pretty wobbly (please see below VRM graphs:

Any ideas ?

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