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12/24V systems

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dfritzj(at)yahoo.com
Guest

Posted: Sun Nov 30, 2008 6:02 pm Post subject: 12/24V systems

Hello all, I'm building a Velocity with a Deltahawk Diesel engine.  This engine requires 24 volts to start, so I'm planing a 24 V system.  Most everything I'm installing is able to handle 24V without any problem; however, the hydraulic pump and associated circuitry that raise the gear are designed for 12V, so I'll need a 12V bus.  I've been looking at battery equalizers as a way to feed this bus from a center tap while not causing a battery imbalance.  There are several different models out there, primarily aimed at RVs, big rigs, and solar electric battery banks.



Does anyone have experience with these units?  Any recommendations on the best unit for use in an aircraft I probably need a 10 or 20 A unit)?  Also, what kind of failure modes do I need to prepare for in architecting a system using these.  Finally, will  having one of these units allow me to effectively charge both batteries using a 12V battery charger (this isn't terribly important, but nice to know).



Thanks in advance for your help.



Dan



           [quote][b]

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Bruce(at)glasair.org
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Posted: Sun Nov 30, 2008 8:03 pm Post subject: 12/24V systems

I'll ask the  obvious. Have you contacted the vendor who makes the hydraulic pump to see if a  24v version is available. If the pump is made by Oildyne, I'm sure a 28v version  can be had. Same with relays.

  

  

  

Bruce 

www.Glasair.org 

<?xml:namespace prefix = o ns =  "urn:schemas-microsoft-com:office:office" /> 

 [quote]   

   --

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n801bh(at)NetZero.com
Guest

Posted: Sun Nov 30, 2008 11:04 pm Post subject: 12/24V systems

I think his biggest obstacle will be actually obtaining a DeltaHawk engine, <G> 

do not archive

Ben Haas

N801BH

www.haaspowerair.com



-- "Bruce Gray" <Bruce(at)glasair.org> wrote:

 I'll ask the obvious. Have you contacted the vendor who makes the hydraulic pump to see if a 24v version is available. If the pump is made by Oildyne, I'm sure a 28v version can be had. Same with relays.

  

  

  

Bruce 

www.Glasair.org 

<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> 

 [quote] 

 --

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nuckolls.bob(at)cox.net
Guest

Posted: Mon Dec 01, 2008 5:38 am Post subject: 12/24V systems

At 07:59 PM 11/30/2008, you wrote:

 	  Quote: 	
		  Hello all, I'm building a Velocity with a Deltahawk Diesel 

engine.  This engine requires 24 volts to start, so I'm planing a 24 

V system.  Most everything I'm installing is able to handle 24V 

without any problem; however, the hydraulic pump and associated 

circuitry that raise the gear are designed for 12V, so I'll need a 

12V bus.  I've been looking at battery equalizers as a way to feed 

this bus from a center tap while not causing a battery 

imbalance.  There are several different models out there, primarily 

aimed at RVs, big rigs, and solar electric battery banks.



Does anyone have experience with these units?  Any recommendations 

on the best unit for use in an aircraft I probably need a 10 or 20 A 

unit)?  Also, what kind of failure modes do I need to prepare for in 

architecting a system using these.  Finally, will having one of 

these units allow me to effectively charge both batteries using a 

12V battery charger (this isn't terribly important, but nice to know).



Thanks in advance for your help.


	


    Multi-voltage systems aboard aircraft are difficult

    to craft for reliability and cost of ownership. The

    only successful airplane I've touched with a multi-voltage

    system had TWO independent alternator-battery systems.

    This was a research Bonanza wherein we drove a second

    alternator from the pad where an air conditioning

    compressor would mount.



    Suggest you go all 24 volt. The 12v accessories you

    cited are probably available in 24 volt.



    Bob . . .

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