Does doubling the speed require 4 times the power?


New Member
I've seen this many times. 2X speed = 4X power.

That woud work out like this:
Say [email protected]@12.5mph = 161Wh/mile then,

[email protected]@25mph = 323Wh/mile.

Now are they letting apples/oranges in that equation using different motors and adding more battery weight?

If ya run up a 36V motor capable of 72 volts for double the speed are the amps gonna double too even if the weight is the same?


Tennessee Squire
Αυτό είναι όλα τα ελληνικά σε με. which means "This is all Greek to me in Greek.


New Member
2X speed (voltage) = 2X power (amperage) = 1/2 the time to cover the same distance.
So, what are you trying to accomplish?


New Member
Yeah ya got 2X the power for 2X the speed so Wh/mile should be the same for that.

The statement often quoted is 2X the speed but it takes " 4X " the power.

Was wondering if this was a good DESIGN RULE when ya double the speed of a golfcart OR is that more for larger auto conversions and at higher speed than 25mph?

I even read where a Power Wheelchair engineer said that it taked 4X the power to double the speed... and he is talking about increasing from 6mph to 12mph.

I dunno know for sure if that is a Hard&Fast rule but it will make a big difference and would like to find out.


New Member
Do you have a cart? Are you buying a cart? What are your needs and what do you envision? Lifted, large tires, number of seats, terrain?