"I would add that it's unusual these days to find desks with 48v phantom - 24v or even 15v is more the norm, as 'studio condensers' requiring 48v are rarely used by live musicians. Some microphones, typically AudioTechnica, require as little as 1.5v, many only need 9v, such as AKG C451, C1000 and the like."

And thereby hangs the other problem! There are a lot more used for phantom power than for microphones - e.g. powering DI boxes and pre-amps - better than having your battery go flat half way through a gig [and cheaper]! By way of example, I have an AER compact 60 whose phantom won't power a Baggs ParaDI.