"Roger (K8RI)" wrote:

Think of just 10 planes stopping in for a charge on a cross country.
With the minimum charge of 1 hour that would require 3,000 amps from
the 220 mains or 1500 from a 3 phase 440 system. That is one
industrial grade, have your own substation hook up. Even with trainers
we need 3 hours duration, but they could be on the order of 100 to 120
HP and those could meet the short charge times and require batters
about 15 to 20% the size above. Now used in the sport plane size
category they could make for some inexpensive flying. To be
competitive they still need a minimum of 500 mile range, but 500 miles
on half the HP means only a quarter of the energy is required. That
could make a fleet of trainers and flight training quote economical.

Do like the propane tanks and exchange them out for a small fee...

This takes into consideration that they bring down the cost of making
the batteries to begin with. The "local battery exchange" can then
recharge the batteries using longer charge times, which would of course
extend their life...