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jestron avatar image
jestron asked

hoymiles 1200 on acOut, frequency watt reaction: mysterious peak

I have some hoymiles 1200 on ac-out. 1/1 rule is obeyed.

During off-grid/usv testing, the hoymiles ramp down resp. switch off as expected during frequency rise.

But when frequency comes back down, vrm shows a short peak load, sometimes more than 1kw. (see screenshot)

img-20231018-100926.jpg

any ideas?


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2 Answers
Alexandra avatar image
Alexandra answered ·

@jestron

It is probably what the AC PV takes to wake up again. Is it off off or in a low power state? I have not used a hoymile so guessing here do you hear relays in it clicking etc?

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jestron avatar image jestron commented ·
Still no clue what might take 1kW after return to 50 Hz. Perhaps a phantom peak, as it appears even when no load is left connected.
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dennibu avatar image dennibu jestron commented ·

Ich könnte mir vorstellen, dass beim Einschalten des NA-Schutzes die Kondensatoren des AC WR plötzlich aufgeladen werden. Ist die Spitze oben glatt, wenn Sie in das Bild hineinzoomen?

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jestron avatar image
jestron answered ·

Thanks for the hint, there are some more loads (refrigerator, fans, pumps) on acOut. Will try to drop them one by one :-] and watch the result on frequency change.

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