What value fuse in solar cable ? (1 Viewer)

[Mike4727]

I am sure I have seen this info somewhere but cannot bring it up on search. I have just installed 120w panel wired through mppt controller to 100amp leisure battery and I understand that I should have inline fuse on positive side between controller and battery but can someone advise what value fuse this should be please, thanks

 

[Techno]

15amp is plenty , you won't blow that with 120 watts

 

[Mike4727]

Thanks Andy, is that the only fuse I need to put in - or would you normally put fuse between panel and controller - I noticed a label with "lightening "type symbol on the positive cable from the panel.

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[Techno]

The instructions do not call for a fuse on the panel side BUT I fit one simply to isolate the panel if required. If you do choose to fit one just make it a big one

 

[Mike4727]

Ah, that's ok then - if I need to isolate the panel I can just disconnect at the panel tails I guess. Thanks for the help Andy, another job off the list

 

[icantremember]

If you do choose to fit one just make it a big one

How big would you suggest Andy?

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[Techno]

How big would you suggest Andy?

That depends on the fuse holder used
A regular auto only goes to 30amp
I have a 50 amp bus fuse which comes on 6mm cable so only needed one through crimp and straight into the regulator

 

[pappajohn]

That depends on the fuse holder used
A regular auto only goes to 30amp
I have a 50 amp bus fuse which comes on 6mm cable so only needed one through crimp and straight into the regulator

Never really considered a fuse in the input line.
Maybe i should know, but i dont.... how can you put a 12v fuse of any amp value in an unregulated 17v to 21v panel to controller line without it overloading ?

 

[Techno]

Why would it overload

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[pappajohn]

Rated at 12v but recieving 17v to 21v

Never even considered voltage through a fuse before so Im having an 'act stupid' day

 

[DBK]

I've never heard of voltage rated fuses - other than some, which are the sort we are talking about, are designed for low, non-lethal voltages, but they are not voltage specific.

 

[Techno]

A fuse is only a conductor and in this instance not used for over current protection but for isolation

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[pappajohn]

as i said, never even thought about it.

 

[JeanLuc]

A fuse is only a conductor and in this instance not used for over current protection but for isolation

I have just opened a thread on a similar topic and would welcome any comments.
http://www.motorhomefun.co.uk/forum/threads/solar-panel-isolation.125362/

 

[Techno]

I use this
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Can just be seen at the side of my selector switch

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