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michaega(at)verizon.net
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 Posted: Sun Mar 16, 2008 1:53 pm Post subject: Electrical Question?? |
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These question are to make me comfortable. I have read enough to contradict my ever setup. I figured I would ask those who have built a nice but simple setup that has worked.
1. ?? I want to the feed and to return the wire from the alternator to a switch on the panel. 14 ? 16 ? 18 ? wire gauge for alternator wire. Should the return wire connect directly to the battery? Cold side of master solenoid (master off) or where? Should I fuse this? I have 50 amp alternator.
2. ?? Master switch one wire goes Directly from the panel switch to the Master solenoid (small connector) and the other to airframe ground. Wire size ?? No fuse??
3. ?? Hot wire feed for the panel should come from where? Direct from battery? Cold side of master solenoid (master off) ? The ignition switch ? Or where? This should be fused I assume with maybe 40 amp since I have 50 amp alternator and many panel circuits.
Any other Ideas that don't blow a budget that has no funds left in it would be greatly appreciated.
Thanks George
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Sun Mar 16, 2008 3:43 pm Post subject: Electrical Question?? |
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1 If you really want to, put a switch in the wire marked F only... If you want to shut off the alternator all you do is chop the power to the field coils. Generally this is exactly what an overvoltage protection circuit does.
2.you should have less than 5A in that circuit so AN22 ga. wire should suffice
3. the main buss should be powered by the battery. I recommend using a relay right on the battery box with a small fused wire (5A 22ga) feeding the master switch which in turn energizes the master relay. The main buss should also have the output of the Alternator, in your case 50A, feeding it. (50 A breaker on 8ga wire). If you have a load meter then you can load your system to 100% (50A) Without the load meter then 80% of the output of the alternator is recommended as maximum installed load.
What I would do depends on a few different things. The type of airplane and electrical lay out are a few of those things. Consider running a 0 ga wire with say a 100 A fuse link in front of the master relay. That wire will go directly to the large lug on your starter motor form there the 8ga. Wire from the alternator and the 8ga wire to your main buss also is connected. You could also power one side of your buss from the battery on one side and form the alternator on the other side.
Get a copy of AC 43.13-1B/2A available online in PDF format and have a look over chapter 11. More good ideas on how to do it safely than you can shake a stick at.
[img]cid:image001.jpg(at)01C887AA.4B08D800[/img]
Noel Loveys
Campbellton, NL, Canada
CDN AME intern, PP-Rec
C-FINB, Kitfox III-A
582 B box, Ivo IFA, Aerocet 1100 floats
[url=noelloveys(at)yahoo.ca]noelloveys(at)yahoo.ca[/url]
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of SUE MICHAELS
Sent: Sunday, March 16, 2008 7:20 PM
To: kitfox-list(at)matronics.com
Subject: Electrical Question??
These question are to make me comfortable. I have read enough to contradict my ever setup. I figured I would ask those who have built a nice but simple setup that has worked.
1. ?? I want to the feed and to return the wire from the alternator to a switch on the panel. 14 ? 16 ? 18 ? wire gauge for alternator wire. Should the return wire connect directly to the battery? Cold side of master solenoid (master off) or where? Should I fuse this? I have 50 amp alternator.
2. ?? Master switch one wire goes Directly from the panel switch to the Master solenoid (small connector) and the other to airframe ground. Wire size ?? No fuse??
3. ?? Hot wire feed for the panel should come from where? Direct from battery? Cold side of master solenoid (master off) ? The ignition switch ? Or where? This should be fused I assume with maybe 40 amp since I have 50 amp alternator and many panel circuits.
Any other Ideas that don't blow a budget that has no funds left in it would be greatly appreciated.
Thanks George
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Noel Loveys
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