Today's Message Index:
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1. 11:03 AM - Questions about protecting the 4AWG wire in a remote battery installation. (Matthew Schumacher)
2. 02:49 PM - Re: Questions about protecting the 4AWG wire in a remote battery installation. (William Slaughter)
Message 1
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| Subject: | Questions about protecting the 4AWG wire in a remote |
battery installation.
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
Message 2
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| Subject: | Questions about protecting the 4AWG wire in a remote |
battery installation.
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
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Matthew
Schumacher
Sent: Thursday, August 04, 2011 1:00 PM
Subject: AeroElectric-List: Questions about protecting the 4AWG wire in a
remote battery installation.
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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