Burnt/melted 30a inline fuse

beaucephus
New Member

Posts: 1

Burnt/melted 30a inline fuse Nov 30, 2015 12:43:28 GMT -8 beaucephus likes this

Post by beaucephus on Nov 30, 2015 12:43:28 GMT -8

I noticed yesterday while cleaning that the 30A fuse between my charge controller and the batteries was melted. The fuse was not blown.
It looks like I was real close to having a fire. I have the Renogy 400w system with a 40 amp Mppt charge controller. I used 10awg wire running to the batteries from the controller. I am wondering if you have any suggestions. Only one side was burnt or hot. Any help would be appreciates

jsb2000
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Posts: 169

Burnt/melted 30a inline fuse Nov 30, 2015 17:57:57 GMT -8

Post by jsb2000 on Nov 30, 2015 17:57:57 GMT -8

Nov 30, 2015 12:43:28 GMT -8 beaucephus said:

Only one side was burnt or hot.

I believe that one sentence holds the clue as to what happened.

That can happen in an electrical circuit when the connection to a component is loose or is otherwise faulty. Essentially, you get a series of micro-sparks and increased heat at that one point and nowhere else...which is sometimes enough to ignite/melt anything in close proximity.

The fuse is designed to blow when increased CURRENT flows through it. A loose/faulty/failing connection does not always draw enough current to blow a fuse. That's why I'm guessing yours didn't blow in this situation.

Admin Administrator Transitioning to new forum. This forum will be locked September 3rd. Posts: 387	Burnt/melted 30a inline fuse Dec 1, 2015 10:39:06 GMT -8 Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Admin on Dec 1, 2015 10:39:06 GMT -8 Hello Sir, I believe Jsb2000 is correct in assuming the issue was a faulty wire/connection. I would also replace the 30A fuse for a 40A since the controller is rated to output 40 amps maximum. O.C

Post by beaucephus on Nov 30, 2015 12:43:28 GMT -8

Post by jsb2000 on Nov 30, 2015 17:57:57 GMT -8

Post by Admin on Dec 1, 2015 10:39:06 GMT -8