I am not sure what sailboat you are considering buying but there are three companies that i know of that appear to drive a boat in the 48ft 30000lbs range up to hull speed. I will point out that a 48ft boat at 30000lbs. We evaluate a system dry weight numbers and not the fully loaded numbers understanding that the sailing weight is greater.
System Speed & Power (LOA 48ft, LWL40ft, beam 14ft, Displacement dry 30000lbs(loaded likely 15% more))
Kts Watts
2.6 960
3.8 1920
4.6 3840
5.1 5760
5.9 7680 Recommend a 10kW genset for this continuous speed
6.5 10560 Recommend a 15kW genset for this continuous speed
7.1 14400
7.8 19200 This is what a 20kW system would provide
8.4 23040 hull speed reached at about 24kW
Hull speed 8.47
Dedicated Marine system (kits not evaluated)
Bell Marine has the 30kW system at 144v liquid cooled (peak is 43kW continuous is likely the 30kW) reduction gear, I believe it is an ac induction motor and I would estimate 350lbs. can be placed in series
Elco has the E70 is a 108v system peak 51.5kW and continuous 29kW air cooled direct drive induction ac motor system, 650lbs (number of installation unknown – I also believe you can get it as a 94v system at less power)
Electric Yacht QuietTorque 40.0 96v air cooled dual powerheads peak 38.4 continuous 32.6kW, PMAC motor system. 155lbs (over 20 installations of boat over 25000lbs dry) - most of the larger installations are 48v QuietTorque 20.0 systems. Can be placed in series
Please add to this list as I suspect there are other especially from Europe of similar size.
Mike
Electric Yachts of Southern California/Pacific
Posted by: mike@electricyachtssocal.com
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