Today's Message Index:
----------------------
1. 03:06 AM - Re: Out of town for a couple of days (Bill Settle)
2. 06:54 AM - Re: Wire size dilemma ()
3. 07:01 AM - Re: Wire size dilemma ()
4. 09:04 AM - Re: What did I do wrong? (John Burnaby)
Message 1
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Subject: | Re: Out of town for a couple of days |
YEEHAAA!!!! Been looking forward to this. Can't wait!
Bill Settle
Winston-Salem, NC
-8 Wings
>
> From: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
> Date: 2007/03/22 Thu PM 10:27:49 EST
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Out of town for a couple of days
>
>
> Dr. Dee and I are climbing aboard the heavy iron bird for
> the Winterville, North Carolina seminar next Saturday and
> Sunday. We'll be off line until Tuesday. If anyone wants
> to attend this presentation, you can just show up. You don't
> need a reservation. See:
>
> http://aeroelectric.com/seminars/Winterville.html
>
>
>
> Bob . . .
>
> ----------------------------------------
> ( IF one aspires to be "world class", )
> ( what ever you do must be exercised )
> ( EVERY day . . . )
> ( R. L. Nuckolls III )
> ----------------------------------------
>
>
>
>
>
>
Message 2
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Subject: | Wire size dilemma |
Alan,
Also, if you have questions about impedance and length, take a
look at and try one of the worksheets from Jim's engineering page. His
worksheet takes out a lot of the guesswork.
http://www.rst-engr.com/rst/jimsdata/index.html
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Sent: Thursday, March 22, 2007 11:24 PM
Subject: Re: AeroElectric-List: Wire size dilemma
--> <nuckollsr@cox.net>
At 09:42 PM 3/22/2007 -0400, you wrote:
><aadamson@highrf.com>
>
>Ok, so I'm planning on a dual alt/batt 24v setup for a Lancair legacy.
>Batteries will be mounted behind the seats, a single 24v Concorde, and
>a backup B&C. I'm stuck on wire sizes to accommodate my goals. Wonder
>if anyone would care to comment. I had planned to run #2 between the
>starter contactor and the starter (both will be on the firewall). Then
>#4 between the Main alternator (a 100A 24v version) the starter
>contactor and the main batt contactor (which will be at the batteries
>about 5ft behind the firewall). Because the standby alternator is only
>20A and a backup, was going to run #8 for it thru the firewall, to the
>battery contact/cross tie. Mine you, the cross tie will be "strap"
>connected so it won't actually be wire there.
>
>But after seeing a few larger airplanes, I started to re-think this
>plan. Perhaps I should use #2 for everything on the Main battery side,
>and stay either with #8 or go to #6 or #4 on the standby side.
>
>Trying to avoid losses over length, etc. I've looked thru everything I
>can find on Bob's site, but most of them are for 60A alternators on the
>main side and 12v, so I'm really not sure what to do.
>
>Any takers?
>
>To help with a little more placement info. The firewall will have the
>starter contactor only, the batteries are about 5-7 (wire feet) behind
>the firewall, the battery and cross tie contactors will be at the
>batteries.
I'd run a 2AWG ground for both batteries. Put crosstie contactor on
firewall to use as fwd distribution point for the two systems. Run
2AWG for
all fat wires on the main battery(+) side and 4AWG for fat wires on
the
auxiliary
battery(+) side.
P.S. Use welding cable for jumpers from battery(-) terminals to
common
gnd and battery(+) terminals to their respective contactors. Use
what ever
style wire you like for other conductors.
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
Message 3
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Subject: | Wire size dilemma |
Alan,
Just thought of something else. As Bob indicated (contactors on
the firewall) Lancair sells a pre-built mountable package which includes
the contactors, fuses etc. I assume you are using the Lyc 540? I am
doing a similar thing with the Subaru engine except my two batteries
will be supported by a single alternator for the electrically dependent
engine. It still makes sense to keep the battery contactor near the
batteries. For these glass boats we need to run a fat 02 ground from the
engine back to the common ground behind the seat. Let me know what you
work out for your battery boxes; I've not designed mine yet.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Sent: Thursday, March 22, 2007 11:24 PM
Subject: Re: AeroElectric-List: Wire size dilemma
--> <nuckollsr@cox.net>
At 09:42 PM 3/22/2007 -0400, you wrote:
><aadamson@highrf.com>
>
>Ok, so I'm planning on a dual alt/batt 24v setup for a Lancair legacy.
>Batteries will be mounted behind the seats, a single 24v Concorde, and
>a backup B&C. I'm stuck on wire sizes to accommodate my goals. Wonder
>if anyone would care to comment. I had planned to run #2 between the
>starter contactor and the starter (both will be on the firewall). Then
>#4 between the Main alternator (a 100A 24v version) the starter
>contactor and the main batt contactor (which will be at the batteries
>about 5ft behind the firewall). Because the standby alternator is only
>20A and a backup, was going to run #8 for it thru the firewall, to the
>battery contact/cross tie. Mine you, the cross tie will be "strap"
>connected so it won't actually be wire there.
>
>But after seeing a few larger airplanes, I started to re-think this
>plan. Perhaps I should use #2 for everything on the Main battery side,
>and stay either with #8 or go to #6 or #4 on the standby side.
>
>Trying to avoid losses over length, etc. I've looked thru everything I
>can find on Bob's site, but most of them are for 60A alternators on the
>main side and 12v, so I'm really not sure what to do.
>
>Any takers?
>
>To help with a little more placement info. The firewall will have the
>starter contactor only, the batteries are about 5-7 (wire feet) behind
>the firewall, the battery and cross tie contactors will be at the
>batteries.
I'd run a 2AWG ground for both batteries. Put crosstie contactor on
firewall to use as fwd distribution point for the two systems. Run
2AWG for
all fat wires on the main battery(+) side and 4AWG for fat wires on
the
auxiliary
battery(+) side.
P.S. Use welding cable for jumpers from battery(-) terminals to
common
gnd and battery(+) terminals to their respective contactors. Use
what ever
style wire you like for other conductors.
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
Message 4
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Subject: | Re: What did I do wrong? |
Bob, Eric & Matt,
A thousand thanks to you all for my education on Zener diodes and how to
get my lamps to work. Eric, you're right about my concept of
Zeners...totally backward. I thought they "spilled" voltage over the
nominal amount instead of absorbing the nominal amount. Now I think I
understand what happened.
John
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