question

goyow avatar image
goyow asked

Isolation Transformer buzzing on electric heated blanket

Hello All, very confused. Victron I.T 3600w 115/230v on a boat connected to shorepower. Very happy and (almost) quitly doing its thing until i plug in the electrical heating blanket. The buzzing is too much and changes with the setting of the heating from low = annoying to high = unbearable. The blanket is an Inventum HN1312V with a draw of 60w. Very curious why this is and if there is a way to still be warm at night and being able to sleep.

Isolation Tranformer
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1 Answer
Alexandra avatar image
Alexandra answered ·

@GOYOW

It is the heat control circuit that causes that to happen. It chops the sine wave.

You can add a diode in a half rectify the circuit in the blanket, if you are handy with that sort of thing. It helps with the blanket getting too hot. And a little with the buzzing but does not solve that issue.

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