Thank you @B51-technician b51 for the additional information.
Can you please advise if this is the style of anti vibration wall plug that you used:
I deployed those ones here:
Thank you for the info. It appears that the plugs you used are only available in Germany. I think the ones I posted are about the best I will get in the UK.
Amazon sells it in Germany as well. Maybe they ship to UK. The one on your picture might not isolate enough and might not take the weight of an MPII mounted on a stone brick wall.
I checked online and unfortunately they do not ship to UK. It is now my challenge to find a local retailer.
For mounting a few Multi / Quattro’s I’ve used Rawplug Rawlnuts in the UK from Screwfix: https://www.screwfix.com/search?search=rawlnut
Hello Community,
is anyone having experience with multiple different MultiPlus hardware versions regarding fan and hum noise? In particular, are there models known as more quiet and others as tentative loud?
regards, Alfredo
Thanks @Al-2.0 They look very similar to the ones I posted but probably a better quality. Can I be a bit pedantic, as I only want to take the heavy machine off the wall once. Did you go for an M6 size with 50mm length and use a cheese head screw (it is not clear how much clearance there is between the bracket and the machine for say a rubber washer plus bolt head)? Did you also have a rubber grommet on the Victron mount to reduce vibration transfer?
At the moment, using your information and that from @B51-technician , I am intending to remove the transformer and put a rubber isolation pad behind it, install the Rawl Flexi Plug, with grommets and cut the edge of the fan to stop the power cable being squeezed between it and the case.
I am hoping to be able to remove the strap to stop the enclosure from vibrating, but I doubt that will be the case. I have already glued sound proofing to the back of it.
In answer to your question @B51-technician my serial number starts HQ2315, it is meant to be quiet but it is far from being that.
Like others I struggle to understand why Victron would spoil a great product by not taking some basic measures.
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In Our company, we have some Fronius Tauro 50 kW.
They are hanging at chains from the steel beams and only touching the wall with some rubber-spacers.
Chains are also “decoupled” by using some rubber spacers that are usually used along with ships to give towing a bit of flexibility.
These guys here:
Works quite well, could imagine that might silence the multis as well 
(Well at least avoids vibrations to spread out through walls and stuff)
Good find Tony, I was wondering what to use for mounting. Is the threaded insert slightly set in from the front so that the rubber bunches up when tightened and holds into the hole? If not then it’s just a thread in a rubber mount and the hole needs to be carefully-sized for a friction-fit to have any pull-out resistance. The multiplus is almost entirely loaded in shear but it’s also bloody heavy so I want to be sure it will stay in the wall!
Pack of 50 at £27 is tiresome when I want 3 (i.e £1.50-worth). Has anyone bought a pack of these and is prepared to post them in 3s for Multiplus mounters at reasonable cost? Should be a nice little ebay sideline.
EDIT: turns out Namrick Nutstore is already doing this on ebay: 5 off M5x40 for £7.47. Rubber Ankernut - Rawlnut - Ramnut M5 M6 M8 M10 | eBay
3 for a fiver would have been nice, but this will do.
Ref: Noisy Quattro 10 kVA
We (my customer and I) are having a similar noise problem with one of his two 10 kVA Quattros (120 volt). Especially when under heavy loads, just one of the Quattros starts a louf humming noise. I have asked Victron rep what is the db rating of the Quattros but have received no reply (our other inverter manufacturers publish dB ratings in their inverter spec sheets).
I seems very suspicious that only one of the two inverters (the slave in this case) makes the loud humming sound. Could this be an indication of a premature failure? If so this would be very bad for this off-grid home to lose its 240 VAC power…ie to lose their air-conditioning in this tropical location, etc.
Thank you for any suggestions or comments.
Jim
@Wookey Sorry for the late reply, I have not been paying attention.
You have probably worked out that the rubber compresses as you screw the Rawlnut bolt up tighter. It is important that there isn’t any chance of the packings to soften over time , eg between the mounting plate and wall. Otherwise the plug could loosen. I have bought some plugs to go into the plate with inserts in to stop that happening. The plugs can be inserted through the mounting plate directly up to the Rawlnut.
I have bought a box of 50 off of the M6 x 50 Rawlnuts. Please get in touch if you would like 3 off. The inserts for the plate are on their way from China, should be here any day now.
Hi! I just got a ESS system installed, most of it is great! What I’m not loving is the constant humming sound of the transformers. What can I do to reduce it? I guess most of the sound is resonating in the cabinet where it got installed. It is located in a server rack with the 3x multiplus II 3000 on the sides and rear of the cabinet.
there is no dampening what so ever. The multiplusses are mounted using the wall bracket, the wallbracket is screwed into the metal case. So it is metal on metal with a big resonating chamber that is the server cabinet.
what if I mount the wallbracket on rubber dampening mats like they use for washingmachines. should this shave a few dB’s off? or do I have to decouple the toroid from the housing.
My problem was similar; I solved it with the cover resonating simply attaching adhesive sponge rubber on the center over the copper transformer (Victron engineers, take note!).
With certain loads, the case was huming like a angry cat, but if I tapped my finger in the center on the case, it made evident that the problem was the vibration of the cover (and the screws were firmly tightened).
Check out the photos. Now the system is silent… happy again.
With a wooden slat chequed that the rubber was going to put enough pressure on the cover (but allowing its placement).
Cheers from Spain.
(Victron Multiplus II GX on single-phase with 5 kW PV and 15 kW lifepo battery)
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@Ringmaster Thank you for the suggestion. I have just applied the rubber to my own machine and need to wait for some heavy loads to see if it has helped. I also retrofitted the Victron PCBA to reduce fan noise. Although my machine is not meant to be affected (according to serial number) the PCB appears to have made quite a difference.
(SPR00090 – PCBA MGR50_MP_II fan PWM converter 40KHz, to reduce the fan noise at low RPM)
I have used these dampers from aliexpress. 30x30 m6.
Before the humming was transferred to the wall and hear able even outside the technical room. Now it’s nice and quiet. Only on full power sone noise is noticeable but far less than before.
I used a self-adhesive sound dampening mat on the inside of the Multiplus cover:
Wat also helps against fan noise is to isolate the metal fan mounting bracked from the case with a strip of eva foam.
To isolate the Multiplus from the wall I used rubber pads behind the mounting bracket:
Hmm. Correct me if I am wrong, but this kind of dampeners is usually designed for axial compression forces (sometimes also for tensioning forces). As in a weight (force) put onto the (inserted) stud. For example to put a airconditioning outdoor unit on top of four of them. But now you are hanging your 30KG Victron Multiplus, as a tensioning radial load onto them. Something like 300Nm in total to be precise.
Sorry. I don’t know, but that doesn’t sound like a great idea.
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Actually I also have seen some examples of using them sideways. And I can confirm this works fine. The dampers are very strong, I really did some extreme stress testing on them and they didn’t break. I use 6 of them per multiplus and I’m 100% sure they won’t break down.
Hey guys,
Schwingungsdämpfer Dresden can deliver professionell dampening systems. On request they will calculate dampening for you for free resulting 90+% dampening.
I am happy with my 10 EUR rubber damper for bathroom. But if this is not sufficient for, please find the link to EluFlex dampers.