# Noisy isolation transformer **URL:** \ **Category:** Q&A and troubleshooting\ **Tags:** isolation\_tranformer, victron\_community, marine, diy\ **Created:** [15 April 2025 13:18 UTC](https://community.victronenergy.com/t/noisy-isolation-transformer/28944 "2025-04-15T13:18:29Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![pwfarnell](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/pwfarnell/32/2341_2.png) [@pwfarnell](https://community.victronenergy.com/u/pwfarnell)\ **Post date:** [15 April 2025 16:14 UTC](https://community.victronenergy.com/t/noisy-isolation-transformer/28944/3 "2025-04-15T16:14:18Z")
There are plenty of threads in here about the humming from Multiplus inverters, they use the dame type of toroidal transformer. A lot depends on how it is mounted, rigidly to a 4mm steel bulkhead between the engine bay and your pillow at night is a recipe for noise. Here is a link to one thread, use search to find others. > [@MultiPlus II - toroidal transformer humming](https://community.victronenergy.com/t/multiplus-ii-toroidal-transformer-humming/10878): > > Dear community, I have a MultiPlus II 5000 48 in a [small DESS system in our house](https://community.victronenergy.com/t/small-house-diy-dess-with-blackout-option-4-5-kwp-9-8-kwh/10808). Located in the basement, wall-mounted, separated by a door. Under some conditions, and that’s not only high loads, humming of the toroidal transformer is very intensive. That intensive, that you can hear it even one floor above in a solid brick build house. After a few days observing, I had to take countermeasures to avoid getting in trouble with the rest of the family. It’s just too loud for an inhouse installa… --- _[View the full topic](https://community.victronenergy.com/t/noisy-isolation-transformer/28944)._