question

offgrid avatar image
offgrid asked

VE.Bus BMS System on/off switch & fuse

Hi there,
In the VE.Bus BMS manual, the installation diagram for a Multiplus shows a
"System on/off switch" connected to the Battery + on the BMS
And it shows a fuse connected between the switch and the battery positive terminal
I have circled them both in green below:


I am wondering, for a 24 system:
* What would be appropriate gauge wire for these connections
* What would be an appropriate switch for this connection
* What would be appropriate fuse for this connection

Thank you in advance :)

BMSwiringfusesSkyllaswitch
vebus-battery-on-off-switch-fuse.png (212.5 KiB)
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1 Answer
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

The "load disconnect" output is rated at 2A an the "charge disconnect" at 10mA.
So you will be fine with a fuse at 2-3A an a wire of 0.75-1.5mm²(AWG 20-15).
The maximum wire size you get into the connectors of the BMS is 1.5mm²(AWG 15).

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