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Questions about protecting the 4AWG wire in a remote battery

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schu(at)schu.net
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Posted: Thu Aug 04, 2011 10:03 am Post subject: Questions about protecting the 4AWG wire in a remote battery

List,



I looked through the book and searched the archives, but can't find an

answer to my question:



I want to mount the battery under the seat and the contactors on the

firewall.  In order to do this I'll need to run 4awg wire about 6 feet.

 From the master contactor I'll run another 4awg wire to the starter

contactor and I'll terminate my panel feed directly onto the master

contactor.



I don't see any circuit protection in any of the drawings, but it feels

wrong to not have a wire that large running that distance unprotected.

Would be be ok to build a fusible link out of some 6awg wire that is

only 3" long or would that cause to much voltage drop for the starter?



Another option is to mount the contactors under the seat with the

battery and run a 10awg wire up to the panel and install a fusible link

on that wire.  Is that more reasonable?  I really don't want to mount a

breaker under the seat because I don't want any critical part of the

electrical system hidden from the pilot's view.  I suppose I could mount

a fuse, but I'm concerned that a fuse failure can take out my panel.

Perhaps a slow blow fuse?



Thanks,

schu

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william_slaughter(at)att.
Guest

Posted: Thu Aug 04, 2011 1:49 pm Post subject: Questions about protecting the 4AWG wire in a remote battery

The master and starter contactors do not need to be in the same place. Most

rear battery RVs have the master contactor at the rear right next to the

battery and the starter contactor up on the firewall. That's the way I'm

doing my RV-8. Alternator output and "panel feed" wire terminate on the

"hot" side of the starter contactor.



William



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