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alessandroparma avatar image
alessandroparma asked

multiplus noise powering a hairdryer

Hallo everyone, I'm testing a second-hand 12/1600 multiplus compact: by powering a hairdryer at intermediate power (600w) the inverter becomes very noisy (not from the fan), do you know what could be the cause? can it be solved?
I made a test with a second and third hairdryer, same problem.
Thanks for your help!


Multiplus-II
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Alex Pescaru avatar image
Alex Pescaru answered ·

Hi @AlessandroParma

At intermediate power, that hairdryer, is using a diode for power reduction.

That diode makes the dryer to use only one side of the sinusoidal AC wave. (half-wave rectifying)

This functioning regime is quite nasty for any inverter and therefore that strange sound like a "growl".

Nothing to worry if the inverter is built OK.

Alex

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alessandroparma avatar image alessandroparma commented ·

thank you

Isn't there a risk of damaging the inverter?
Why doesn't another brand's inverter have this problem?

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Duivert NL avatar image Duivert NL alessandroparma commented ·
multiplus is a inverter with a torodial transformer, thats what you are hearing, should be no problem

others use electronic transformers

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Alexandra avatar image Alexandra ♦ Duivert NL commented ·

Seconded. High frequency inverters with no transformer wont have the issue. Because of the physics involved.

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