My Multiplus fan (?) is noisy between 2200–2400 watt inverter or charger power. It’s not the airflow that I hear, but its more like whining. The Multiplus is in a separated tech room on the attic with closed door and I hear the whining in our bedroom on the first floor and woke me at 4 am (dishwash…

Here is a video of the whining sound, it’s this normal?

Pretty much. Depends on load. How and where it is mounted can affect it.

Is this the fan I hear or something else like coil or other electronics?

That’s the fan. My own parallel set, two units use of the fan is completely different under same loads. Seems to be load related and affected by how you mount it. Ours are all on thick brick walls. Hollow walls amplify the problem. Considering most installs are in garages or dedicated external b…

We don’t have a garage unfortunately, only a wooden storage which is humid and cold so not the ideal place for electronics and lifepo4. The multiplus is mounted on a brick wall and I’m going to place dampers between the wall and the victron. But I’m curious if I can cancel this whining sound with …

The fan will always do that, I don’t think adding more fans will change the internal fan behaviour which is driven by load as one of the variables. Disabling the fan will have other performance consequences even with external ones. There are many topics here and in the archive from users applying …

That’s why it’s placed on the attic, dry and around 19 degrees at the moment. That’s also why a low noiselevel is important especially during the night.

Fans don’t get oiled, and the sound is not uncommon, though undesired in this instance. You are welcome to send it for testing, though I would be surprised if any further action resulted. Depending on use and location, and noise sensitivity, there are often complaints, but equally there are vast n…

Mutliplus II 5000 sounds like a vacuum cleaner

Q&A and troubleshooting

lxonline (LX) 9 January 2025 05:21 2

There is also this one.

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Mutliplus II 5000 sounds like a vacuum cleaner

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