H-bridges Further:-
>         Well, it's 36, not 26 volts. And no, it can't go higher because
> it's for a speed controller for a Solar Splash boat, and the rules limit
> us to 36V battery voltage, and 54V peak RMS. No way around it.

Consider using a boost converter (read SMPS) to convert the battery voltage
to a sensable voltage like 360v DC simple push pull into a transformer at 50K
this should give around 85-90% effecency and then use a varable frequency
drive into a standard 3 phase motor this should minimise the losses and
decrease the drive current levels to the motor. Doing this would make the
motor drive more effecient. I may have missed the point here but is the motor
limited to 54v or is that the maximum voltage from the solar array.

Cheers Steve.....