REFLECTOR: [c-a] Re: COZY: 24 Volts VS 12 Volts

[Dave Philipsen]

Heh, heh...nice techno-humor!  The only point I'm trying to make with all of this is that, yes, there are some benefits with a 24v system.  There would be even more benefits with a 48v system and even a 96v system. But at some point the advantages of increasing the voltage diminish to a point where they are not really practical.  Obviously, for automobiles, the engineers decided almost universally that that point was at 12 volts. I believe that for our experimental aircraft the point is also at 12 volts. But, others with perhaps deeper pockets and a desire for slightly greater reliability and dependability may arrive at the point of 24 volts.

>> Dave Philipsen
>> Velocity STD FG
>> N83DP


> On Oct 7, 2013, at 11:08 AM, Don Johnston <numa at comcast.net> wrote:
> 
> You are forgiven.
> 
> Now go say 50 "Hail Tesla's" and sin no more. :-)
> 
> 
>> On Mon, Oct 7, 2013 at 10:35 AM, Dave Philipsen <velocity at davebiz.com> wrote:
>> I messed up on the 24v calculations. Strike out the paragraph below and change to:
>> 
>> The same scenario with a 24volt 100 amp starter would work out to a 290 milliohm total resistance (starter is 240 milliohms and solenoid contacts are 50 milliohms). The circuit will now draw 82 amps and you will see 19.86 volts across the starter and 4.13 volts across the solenoid contacts.  This is a better scenario than the 12v system but not as exaggerated as the scenario you stated below.
>> 
>> 
>> Dave Philipsen
>> Velocity STD FG
>> N83DP
>> 
>>> On 10/7/2013 10:15 AM, Dave Philipsen wrote:
>>> The same scenario with a 24volt 100 amp starter would work out to a 170 milliohm total resistance (starter is 120 milliohms and solenoid contacts are 50 milliohms). The circuit will now draw 141 amps and you will see 16.9 volts across the starter and 7.1 volts across the solenoid contacts.  This is a better scenario than the 12v system but not as exaggerated as the scenario you stated below.
>> 
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