The recommended connection point for the power wire on both the Smart Shunt and Battery Sense is the positive terminal of the battery. I understand this is for obtaining the most accurate voltage, temp readings, etc.. The concern I am seeing is that modern day LiFeP04 batteries, in a worst case scenario, could possibly have an internal short circuit event (yielding the possibility for 1,000’s of amps depending on the battery configuration), which is why electrical theory recommends proper fusing that can handle such events.
The installation diagram for these devices show the power source wire directly to the positive terminal upstream from an appropriate fuse.
The question is why? How does this make sense following normal electrical theory? Is it possible that much current being pushed through that small of a wire would simply vaporize the wire, in turn removing the possibility for that amount of current to continue down that path, then by default the current would flow down the actual battery wire to the appropriate fuse, which would then isolate the event?
I am curious if any Victron Engineers would be willing to chime in and provide some feedback, helping to reassure the current recommended wiring procedure is not a safety concern.
I am not an electrician or an engineer and I could very well be seeing this incorrectly, which is why I am reaching out. Please go easy on me!
Respectfully,
But also depending to whats on the other side of the wiring. You’ll never get 1000’s of Amperes over a 1A fuse connected to a 0,35mm² wire.