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.
