Joseph, FWIW, I am not an engineer.
I don't think you want to multiply efficiencies in this case. Both motors draw from the same source at their respective efficiencies. You should multiply the efficiency of the charger times the efficiency of the battery pack times the efficiency of the motor to get electrical efficiency. You also have mechanical efficiency of the drive train to take into account if you have one. If you are driving the wheels directly, you eliminate drive train efficiency losses and weight. There may be a decrease in efficiency of the battery pack with the load of two motors. You wouldn't calculate that by multiplying motor efficiencies. Check battery specs. The motors are probably slightly more than 90 percent efficient and the battery pack is probably about 90 percent efficient. Check your charger specs. Cheers, Al Lococo www.evprogress.org ----- Original Message ----- From: "Joseph T. " <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, June 21, 2008 12:58 AM Subject: [FLEAA] In-Wheel Motors? > I've always thought that one motor is more efficient than two because > if a motor is 90% efficient, when you have one, you'll have 90% > efficiency. On the other hand, if you have two, you would only have > 81% efficiency. (90% times 90%) Right? Is this correct? > > _______________________________________________ > Florida EAA mailing list > [email protected] > http://www.floridaeaa.org > > _______________________________________________ Florida EAA mailing list [email protected] http://www.floridaeaa.org
