EasyPlus charger making humming noise when SOC near 100%

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buha asked May 29, '21

EasyPlus charger making humming noise when SOC near 100%

I have an EasyPlus 12/1600 here which charges a smallish battery. When the EasyPlus is in Storage or Float mode, it makes an annoying noise, a constant hum or buzz, that changes slightly every now and then, but is always well audible.
My questions are:
- Is this a normal thing for the EasyPlus? Could the humming be caused by some bad external wiring or wiring error?
- Is this the same for the other MultiPlus units? Even the ones labelled as "new model, intended to replace the old MultiPlus series"?

- What about the Phoenix Smart IP43 or Skylla IP65? Do they makle any noise during any SOC?

Thanks!

EasyPlus

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Answer 1 · 2021-06-24T12:40:22Z

Jesse answered · Jun 24, 2021 at 12:40 PM

It's very normal sorry, there are a few threads over these forums discussing this very same hum.

I have a new style multiplus 12/1600 which does the exact same thing at low currents. I don't use it for float, at all. The MPPT's can float quietly, then we just slowly discharge overnight... If I want to float silently I have a crummy old Projecta 25A charger which will do it with no sound!!

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