---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 08/04/11: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 11:03:40 AM PST US From: Matthew Schumacher 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 ________________________________ Message 2 _____________________________________ Time: 02:49:36 PM PST US From: "William Slaughter" Subject: RE: AeroElectric-List: 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.