GL: electric propulsion

[Tommy Terrific]

I just got a call from a friend attending a trade show.  He said he was at a
booth where they are selling electric motors capable of pushing a 25,000# boat
at speeds up to 8kts.  The boat has a large battery bank and two 50amp
multibank chargers.  The chargers are run using a Honda generator which
consumers about 1 gallon of gas every 8 hours.  Anybody have any thoughts
about such a system?
Tommy