For STL’s see multiple options:
@RienkP would you mind to share the STL
Thanks Nick! Inspired by you we had implemented a similar set up, adding extra cooling also to the box where we have our solar system.
You can find more information here
Also the diagram to connect everything in here
Our set up includes:
- 3D Printing piece by Nick Ebben
- 2 x 80mm Artic P8 Max fans
- 2 x 140mm Artic P14 Max fans
- 1 X DC-DC Buck 48V - 12V with 10A max (48V to 12V converter)
- 1 X Thermostat XH-W3001 (Temperature controller set to 30ºC and place the thermometer on top of the inverter)
Hey Nick
I have a question regarding your connection of the fans:
Fans 12 v plus and minus go to a stepdown converter. Where does the 3rd PWM cable go? Into the Relais too?
The 48 V Cable plus and minus of the stepdown converter go to the relais K1( M in the screenshot) right?
Would be nice if you could explain your setup to me.
Thanks!
@vaursechs could you give me a hint on how to connect the Fans/STC to the relais please?
I don’t use the PWM cable, only + and -. The negative of the fans goes directly to the 12V source. The positive goes to the relay and from the relay to the 12V source.
@vaursechs Thanks! I’ll give it a try
Is there a software tuning for the internal fan curve or a rough setting(not disabled but lower) in any way? Even in sub freezing temps in my garage the fan ramps to full and makes a alternating looping frequency(also could be tremors in the wall structure) that is really irritating during the night when the electricity is cheap, but when I like to sleep in the next room near the garage. I could test the disabling of the internal fan and adding externals on the bottom, since right now the howling internal one is not acceptable. But is there any way to just turn it down a bit and not completely disable it. Seems like a missed opportunity not to add a middle ground to the fan curve.
NO, as far as I know it is a analog control system using a number of ntc’s in different locations connected in series. The only digittal option is to enable/disable the fan using an MP assistant (that can be controlled by other assistants or an external input).
I just ordered a 3x dual fan solution from Etsy to have additional flow to my 3 phase setup. Does anyone know if you DON’T disable the internal fan, will it result that the default fan will become less noisy as you add more cooling air flow to the bottom of the unit? Or does the default fan just ramp up to the same maximum rpm when the charger is running at full 70A in MP2 5000?
Hello, I have a Multiplus-II 48/10000 and at night the noise is quite annoying. Which fans do you recommend and what 3D model would be interesting to use?
Does anyone have a file for a dual fan setup for a MP2 3000? My daughter printed the one from the OP but it is a little too wide to fit my 3000.
Ordered the 5000 series solution from this supplier: https://www.etsy.com/shop/PetersIndustries?ref=shop-header-name&listing_id=4348092502&from_page=listing
Used the “silent” assistant in Victron Connect programming on my Multiplus units to disable the fan.
This additional downward push airflow and negative Celsius ambient temperature still gives me 9-10kW (10,5kW constant with that irritating internal fan) of average charging power in total of 3 units. I do have a 15S battery, so 48 to 51V difference will give you even more power.
For the summer, I just disable that assistant to “closed” when enabled. So I can run it with full power when solar is maxing the MPPT and AC Fronius into the grid(when batteries are full, 200A converting to the grid from 450/200 MPPT source with 16kWp solar).
At summer I wont be charging at night time from the grid so it wont bother me when sleeping. During the day the noise from the garage wont bother me.
After 2-3 months of winter. 0 to -22C inverter ambient temps. The sound or lack there of is just perfect. I can just hear a gentle CONSTANT humming from the garage next to my bedroom. Only barely audible(when charging with 9400W, totally silent bellow 5000W) and a very nice low tone humming, with no frequency changes. Just as it should be from the factory. Just a shame that Victron does not provide this experience out of the box with better “audio solution”.
The new 6k5 Multiplus does have 2 internal fans, but I understood that it still has no curve optimizing to reduce noise. Just silent or full power as with the old 5000 series. Please correct me if this has been changed via firmware update.
I experienced some noise from the inverters (in the basement below our bedroom) when discharging into the boiler and car overnight.
These are multiplus II 48/5000/70 in three phase setup.
The noise I’m hearing is more of a howling though (like the wind on a stormy night). See the video attached, you can hear the howling from second 3 onwards.
Can someone confirm this howling is fan noise or noise from the transformer coil itself?
If it’s not fan noise a mod like this won’t help me right? What would? The inverters are recent models (September ‘25) and are mounted over permacell and concrete plywood to an underground wall of hollow concrete blocks like the one below.
An easy test is to use Victron connect and program the units with “Silent mode” assistants(you can add a physical switch if you like, but I opted to make the software setting to always keep it on). If Silent mode removes said howling noise, then you know that it is purely the fans ramping. It sounds like the fans on your video. The silent mode ramps up to over 10,5kW for a while before throttles down to 8-9kW after like 30min or so for sustainable power levels for hours of charging. You might like is as-well even thou it cuts the peak power for charging. I didn’t need the max power during winter with 60kWh battery bank. 6h was plenty of energy every night from cheap rates. Silence is much more important.
Hi, STL of this version? and what diammeter have magnets? Thanks alot
This is not my design, but from Profile - ejrossouw - Victron Community
I would love to have the print file of the inner fan holder, though. Sorry for the confusion.