What size fuse between 160A alternator and 675A batteries?

[WotEver]

I seem to recall Snib stating on here several years ago that disconnecting an alternator load while it was working hard is more of a theoretical danger than one which he has seen manifested. But I could well be mis-remembering.

 

Hopefully he'll be along in due course.

 

I don't like the idea of a fuse or an isolator in the alternator charge circuit but if we must comply with the BSS then a fuse is preferable.

 

Tony

[swift1894]

I haven't been following previous posts on this, so I'm afraid I assumed 'alternator' meant alternator i.e. Just the one. My mistake

Richard

In my case it is one alternator.

[WotEver]

In my case it is one alternator.

But it's a biggie - so should be connected to the domestic bank.

 

Tony

[swift1894]

But it's a biggie - so should be connected to the domestic bank.

Tony

It is. ? Edited April 6, 2016 by swift1894

[smileypete]

I seem to recall Snib stating on here several years ago that disconnecting an alternator load while it was working hard is more of a theoretical danger than one which he has seen manifested. But I could well be mis-remembering.

 

Hopefully he'll be along in due course.

 

I don't like the idea of a fuse or an isolator in the alternator charge circuit but if we must comply with the BSS then a fuse is preferable.

 

Seen one post reporting a likely failed/cooked alt due to idolator being inadvertantly opened:

 

Alternator wiring direct to Battery

 

If a fuse must be fitted I'd prefer a high value for short circuit protection say a 500A Megafuse. Less chance of being inadvertantly blown due to dropped spanner incident.

[ditchcrawler]

 

There's not going to be a dead short across the alternator terminals, I'm too careful for that and they're insulated by covers anyway.

I bet every electrician that has shorted a DC supply has said that