Posted for "Bruce Gray" <Bruce@glasair.org>:

 Let me jump in here. The main benefit of a 28v system is electrical
 power. A  70 amp 28v alternator will put out as much wattage (Power) as
 a 140 amp 14v alternator. This is the main reason that all certified
 manufacturers have gone to 28v systems.
 
 Bruce
 
 Glasair III/28v
 
 www.glasair.org