Pre-cursor: I live in Australia, it gets hot - I want to be able to use this in 40c days if necessary. Thus I’m using a water-cooled motor and ESC. Also, right now this project is all theoretical, and I’m checking the feasibility of the project from a cost, point of view, and whether the result is worth it for me.
So I’ve already done a bunch of engineering analysis to work out how much power I need, what gear ratios to allow me to get to highway speeds comfortably (highway speed 100km/h, so the vehicle should be able to do 150km/h, thus I’m not pushing the vehicle to its limits for extended highway use). However trying to calculate the rough range of the vehicle is beyond me, because I’m not sure exactly how many watts the motor will be pulling to maintain 100km/h. (I know to take everything with a lot of salt because it’s almost impossible to know exactly how much wind resistance, final drive, gearing and other inefficiencies will be).
So I turned on online calculators. I was VESC had an online calculator which didn’t have anything near the motor I was planning on using, so I modded the webpage to take it. Also, the page only allowed up to 10 cells in parallel, and I was going to have at least 13 so I just multiplied the range by 10/13. (Note 12S13P for the initial build, I will add more packs in parallel as time goes on). VESC gave me a range of 9.9km when riding at ~100km/h.
I then also used the way back machine to use calc.esk8.today which has been referenced elsewhere on the forum. Input the respective numbers and it told me 175km range… Which is just a bit more than a small difference… Hence my confusion.
Can someone give me a better way to get an approximate estimation? Because the fact that there are massive discrepancies proves that something is going seriously wrong in one or both of these calculators.
Gear ratio: 1:6 (motor:wheel)
Final drive: chain (allows for cheap and easy gear ratio adjustments later)
Battery: 3.7V 3.4A - 12S 13P
Motor: 8kW 200kV - 18Nm, 158A
ESC: FSESC 200A 60V (based on VESC6)
Weight: 180kg (rounded up a lot, frame, batteries, wheels, rider, motor, all inc.)