I am interested in increasing the range of electric/hybrid vehicles. Increasing the energy density of batteries is something chemists, materials scientists, and chemical engineers worry about. What about from the electrical side though? Can electrical engineers do much to significantly increase range? Although I am an EE student, I have not taken any classes in power electronics yet so I may no be accurate with what I'm about to say. I could not find any specific numbers on efficiency of power inverters but typically, power inverters reach about 90% (maybe even more) efficiency at their rated power level. Correct? Now could power inverters ever become extremely efficient (without the use of superconductivity) to the point that they will have greater than 90% efficiency at various power levels? Driving speeds are dynamic and therefore the electric motor(s) require all sorts of power levels depending on the speed and acceleration of the vehicle.