REFLECTOR: 24 volts vs. 12 volts

[Joe]

Doug,
No real downside if all the components you use are rated for 24v (radios etc.)  You will need speed brake and trim actuators for 24v or build a voltage divider into those circuits.  I was going to go 24v myself, but since I am doing an auto conversion finding a 24v starter and/or 24v ECU made it easier to stay 12v.

Be careful with your statement about wires being smaller by 1/2, wire size to current capability is not linear.  The wire length also has to be included into wire sizing so that there is no more than a 0.5v drop on 12v circuits and 1.0v on 24v circuits.  AC 43-13 is a good source for sizing wire in aircraft applications.

One possible downside, if you want 110 vac power for say a laptop computer, you might have a hard time finding a 24V inverter.

Joe
  ----- Original Message ----- 
  From: Douglas Holub 
  To: reflector at tvbf.org 
  Sent: Sunday, January 16, 2005 10:37 PM
  Subject: REFLECTOR: 24 volts vs. 12 volts


  If I have a 24 volt system I'll use half the current so my wires can be smaller by 1/2 and I'll save a pound or two. What's the downside?

  Doug


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