In the community archive is a topic ’ Multi RS temperatures and fans…’ (jan 2024)
I recently installed a multi rs in my house. The noise is too much for my family. The inverter hangs on a concrete wall in an open attic above the stairs. (see profile photo)
@guystewart : can you share the actual programming of the fan speeds? I removed the cover this evening and the noise was much less during full load (5kW DC to AC)
@alexpescaru : how dit you detach the fans in order to install anti vibration rubber mounts?
There’s no space for my screw driver. And I think there’s no space to put the rubber. The fan’s are very close to the heat sink.
Slowly, methodically, with a flexible screwdriver extension, dismantling all screws and cables, up until having access to that panel where the fans are mounted.
The rubber mounts add max 1mm, so there is space.
Have fun!
Thanks for your reaction.
Yesterday evening I installed the rubber mounts (Noctua NA-SAV2)
Unfortunately I experience no noise reduction. To be honest I also did not expect it.
I think about changing the sunon PF80251B3-1000-A99 fan with noctua NF-A8 PWM.
but: the sunon has airflow of 90m3/h at 4200 RPM and the noctua only 55m3/h at 2200 RPM
And the sunon has a 2 wires connection to the multi rs and the noctua has a 4 pin connection cable.
I’m also thinking of making a new cover for the multi rs. To increase the depth and the height. I can then also add some soundproofing material in the cover. I’m an engineer at a stainless steel factory. And with the help of the victron supplied 3D model it must be ease to make a new cover.
A side question, if you allow me…
Which is the year and month of manufacture of your MultiRS? Those 4 digits after HQ in your serial number?
I am asking because I am seeing additional things in your hardware. See below.
The AC fuses are taken out of the case and that additional (relay ??) board…
Do you have the relay board inside, like in the second picture? Or it’s that one outside?
Thank you!
Thanks a lot for sharing the info.
Now I realized that the fuses on the left of the AC connections are for the PV circuits.
A new hardware revision, probably after the problems with the fires on the PV section.
But the board below is an additional one… Is it also for the PV circuit?
I have the feeling that’s a board with some surge protectors, like in the old MultiRS TR version (without MC4 connectors).
Like the ones here: MPPT RS 450/200 PV board red switches - #2 by alexpescaru
Can you confirm it?
Many thanks again and sorry for hijacking the topic with other things!
Back on the original issue, in my case, the fan sounds became somehow deeper (lower in frequency) and helped, because I sleep in a room pretty close to the inverter and, maybe I am weird, but I sleep better with that sound…
Thanks for that. Now it’s clear, it’s a PV protection board.
As for the fans, I would not change them…
At low power you will probably not see any differences as the airflow will be enough to cool things down (much slowly, but they will manage) , but at high power the airflow will not be enough and the inverter will heat up.
Probably will not malfunction, but the power will derate.
I’m planning to make a new cover with soundproofing material in it. Below my actual phase of the design. I’ll add some holes at the sides just above the top. victron multi rs new cover.pdf (623,4 KB)
