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[PSUBS-MAILIST] Battery Switches



What switches are available for changing how lots of batteries are combined in order to change the voltage to a motor?  There has got to be something simpler that an bunch of 200 amp latching relays. 

When I toured the WWII subs I remember a bank of large handles.  Were they recombining the batteries to control the motors speed?

I am trying to avoid a big expensive PWM and any power losses associated with it. 

How is Euronaut controlling motor speed?

Thanks
Doug J