If you own a Victron Multiplus, you know that the pre-installed fan can be quite noisy. There is a software setting which disables the internal fan, however due to the higher temperature, the multiplus will throttle down a lot earlier with fan-stop enabled.
Therefore I’ve designed and 3d printed this dual 80mm fan bracket combined with high speed 80mm fans (I used Arctic F80 Max fans) to drastically reduce the temperature of the multiplus under full load. The bracket is designed to sit flush with the bottom, without any screws. However there is room to secure the bracket with 2 small screws.
In my case, the noise of the internal fan wasn’t an issue for me, but under full load, I often got a High Temperature warming on my multiplusses. With these extra fans installed, temperatures are down at least 20 degree C. (measured with FLIR One camera).
I used a step down converter from 48V to 12V, then I connected the fans to the Multiplus Primary relay and I configured a relay assistant to close the relay when the internal fan starts and open the relay 10 minutes after the internal fan stops.
However if you don’t want to use the internal fan, you need to setup a different assistant or use a thermal switch.
Took some inspiration from this (not suitable for my smaller print bed) and the other external version to create these which now are combined in a final combination version where internal mounting where wires may be problematic. Movable, magnets hold it in place and it can be moved as required.
really like your solution to the cooling fan mount any chance you can share the file or would be happy to buy 2 off printed from you? sorry if this is not the correct way to do things but love your design.
Thanks for this great idea for adding extra cooling. I had no access to a 3d printer so simply made a support from 5mm plywood and attached the two Arctic P8 fans with double sided tape. I’ve not completed the installation yet but fan control will be via a thermostatic probe attached to a W1209 thermal device. The probe will be placed under the front cover as high up as possible. My external thermal tests show the cover in this area reaches well over 55C when the system is running at full load on a 30C day. High temperatures are an electronics killer so anything you can do to reduce them can only improve long term reliability.
I have also fitted cooling fans around my Victron MPPT for the same reasons.
