Forum Discussion
2oldnslow
Dec 14, 2014Explorer
jrnymn7 wrote:
My understanding is the fuse is to protect the controller from a shorted battery, not the other way round. Am I mistaken? ...
You are mistaken. The fuse is there to prevent a fire if a failure causes excess current to flow and overheat that wire. In this case, the most likely failure would be a short in the wire or in the charge controller. That would blow the fuse and stop the current flow.
A "shorted battery" would have no voltage and therefore provide no current to the wire or controller. The charge controller has a limited output current so it can't provide enough current to overheat the wire, even into a short.
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