This is an update regarding the school project, originally designed around the etek motor. Sourcing, cost, time, and a couple other reasons persuaded us to go with the Leeson motor that was previously mentioned. BTW it is 3hp 3000 rpm 86 amp, duty: INT, with 84 in/lb of torque @ 36V. It is a bit powerful but it was free...
For the time being we plan to run it at 36v. We may step down to 24v so battery mounting can be symetrical, but that would require a level of amperage that is not feasable and will affect my torque...right? (Also is the voltage constant simply: rated rpm/rated voltage)? i.e. 3000/36 = 83.3rpm/volt???
With help from UsaTracy and many other I crunched some numbers and came up w/ the following regarding batteries..I'm pretty sure I messed up...lol)
3hp = 2238W = 2500W needed for 1 hour...1250W for .5h
65% needs to go to motor(Please tell me where 65% comes from...is it the chemistry?)..therefore thats approx 815W/h need to supply in capability
815/36 = 23 Amps average draw
which is 46 Amp draw over 30 min
Thats how far i got...THE THEORETICAL APPROACH
Then theres the issue of discharge rates...ahhh...lol
now...the more practical LETS RIDE & TEST APPROACH
Power sonic has some very cool batteries, I was recommended to them. A particular 35AH battery will provide a peak draw of 100Amps for less than or equal to 7min. And guess what since i will only need to have to "operate/navigate w/" the scooter for 30min theres no chance I will peak out at 86amps for 7min continous. So technically this battery will do the job i think.
Presenting this problem to many technical individuals, the latter approach is the more practical common way.
Eek thats all for now, I hope im not stressing too much..lol
Many Thanks for your continued support!