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-   -   12 or 24V? (http://www.vansairforce.com/community/showthread.php?t=148132)

asw20c 03-29-2017 09:09 AM

12 or 24V?
 
I feel like I should already know the answer to this question, but here goes. Are the wiring harnesses provided by Van's for the RV14 designed for 12 or 24V systems?

n982sx 03-29-2017 10:17 AM

The wire sizes were all appropriate for 12 which means they would work for 24. I'd be very surprised if anyone is building a 24v Rv-14, but the wiring will work.

If you're contemplating building a 24v RV-14, I'd be curious to know why. My guess is that with so little weight savings in downsizing the wiring for 24v the battery needs would raise the weight. I haven't really thought about it however, seems like a lot of complications at first blush.

jwoolard 03-29-2017 12:39 PM

I think the main advantage of 24V systems in small aircraft is engine cranking power and battery endurance after a failure.

With modern starters engine cranking isn't an issue.

Arguably the default battery on the -14 doesn't have enough power for proper IFR endurance. At least two builders have gone with a full dual bus architecture to counter this, and lots of others are putting in two alternators and backup batteries for EFIS devices.


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