REFLECTOR: 12 Volt .vs. 24 Volt

[Andrew Ellzey]

The main issue that kept me from going 28 volt is the XLRG retract system hydraulic pump for our Velocities is 12 volts and needs a 30 amp power source.

Andy Ellzey 



----- Original Message ----
From: Gary Stull <gstull at tampabay.rr.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Sunday, May 17, 2009 3:53:12 PM
Subject: Re: REFLECTOR: 12 Volt .vs. 24 Volt

Actually in my opinion a 12 v system is much less expensive with minimal 
weight gain. As far as circuit breakers, on A/C Spruce's site, the 
difference between a 10 amp and 20 amp breaker is between zero and 2 
dollars. But check out the difference between a 12v and 24 v battery. It is 
double. You could use 2 12 v batteries in series, but that would more then 
offset your weight savings from smaller wire. Your options for numerous 
components are limited with 24 v systems, primarily aircraft only, no 
automotive components could be used anywhere unless you reduced the voltage. 
I'm a working A&P and realize there are some advantages with a 24 v system, 
but unless it's a large aircraft like an airliner, the savings in weight are 
minimal. Very few of the homebuilt aircraft I have seen use a 24 v system. 
Maybe there are more 24 v converts out there, but I can't imagine any real 
savings from 24 volts. Just my 2 cents
----- Original Message ----- 
From: "Brooke Wolf" <bwolf1 at tds.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Sunday, May 17, 2009 3:31 PM
Subject: REFLECTOR: 12 Volt .vs. 24 Volt


> All
>
> Almost every time I start a new phase in the building process of my 
> XLRG-5, I am a bit slowed because I have not decided on an electrical 
> system. I would be interested in hearing the opinions of the  collective 
> as to any advantage of a 24 volt system.  It would save  some weight with 
> smaller gauge wire, but I think the weight savings in  negligible.  Other 
> than that, I can't think of an advantage.  One  major sticking point in 
> the decision making process is Cessna, Cirrus,  and others.  Are they 
> putting 28 volt systems in their new airplanes?  If so, one would assume 
> there are good reasons for doing so.  Does any  one know what those good 
> reasons might be?  I've got to get off this  fence and get on with my 
> project!!
>
> BTW I plan on a robust electrical system (probably 2 alternators, 1 
> battery) to support a fairly sophisticated IFR panel with sufficient 
> redundancy for serious weather flying.
>
> Thanks.....Brooke _______________________________________________
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