I have seen some discussion on this in old threads, but nothing definitive....
excuse the unrealistic numbers but metric seems to work well here.......
If I have 10 x 10v 10ah cells, I can wire them as 100v 10ah.....or as 50v 20ah...either way I have 1000 watt hours available.
for either configuration, the same work will be done in theory say 10amps @ 100v will give the same output as 20 amps @ 50v - but in reality, what happens?
Obviously the speed & winding needs to be considered.....the motors most efficient "sweet spot", presumably right before it reaches saturation.
If the motor's most efficient speed matches the voltage correctly then I would assume that would be best, but if you double the voltage then you have to work with 50% duty cycle and it's consequent losses......I don't see any motors rated at 100v for example, so this has to be considered.....
The controller also has a sweet spot - 100% duty cycle I presume. So for most scenarios this would seem to favor the lower voltage. But as I understand it higher volt / lower amp situations have less heating losses....so what wins out?
excuse the unrealistic numbers but metric seems to work well here.......
If I have 10 x 10v 10ah cells, I can wire them as 100v 10ah.....or as 50v 20ah...either way I have 1000 watt hours available.
for either configuration, the same work will be done in theory say 10amps @ 100v will give the same output as 20 amps @ 50v - but in reality, what happens?
Obviously the speed & winding needs to be considered.....the motors most efficient "sweet spot", presumably right before it reaches saturation.
If the motor's most efficient speed matches the voltage correctly then I would assume that would be best, but if you double the voltage then you have to work with 50% duty cycle and it's consequent losses......I don't see any motors rated at 100v for example, so this has to be considered.....
The controller also has a sweet spot - 100% duty cycle I presume. So for most scenarios this would seem to favor the lower voltage. But as I understand it higher volt / lower amp situations have less heating losses....so what wins out?