Very interesting Setup from Mega Motors

[coolhandcountry]

By dropping the gearing down on motor. You change the torque load on
motor and also changes the amp draw. Also with more voltage on a motor
you don't have to run as hard so the amp draw is not as bad. If the truck
will flip over at 750watts. The higher voltage will make the truck flip with less
throttle input.

When you got to 5s you stated you changed the gearing.
You are adding more current avilible with another cells as well.
If some one has an eagle tree. It would show up better.

[BrianG]

I too noticed increased runtime with more cells, but that turned out to be simply that you are into the throttle less to achieve the same speed. The max power with a higher voltage setup is higher, so you don't need to push the batts as hard to get the speed you want. There is some savings with higher rpm since there is a little more "resistance" so that helps too.

[GriffinRU]

Originally Posted by BrianG

I too noticed increased runtime with more cells, but that turned out to be simply that you are into the throttle less to achieve the same speed. The max power with a higher voltage setup is higher, so you don't need to push the batts as hard to get the speed you want. There is some savings with higher rpm since there is a little more "resistance" so that helps too.

You will get better efficiency overall with higher voltages. All losses associated with resistance goes down with the current.

Power loss = Sum[I^2*R(x)],
where R(x) resistance of:
- motor
- wires
- connectors
- FET's
- Cap's
- Batteries
- ...

Going really high in Voltage is not good as well :) There are obvious reasons and electrical.

Artur

[BrianG]

Doh! How could I forget wiring losses! :007: