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Old 04-14-2009, 03:37 PM   #1 (permalink)
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EV Calulator?

I'm new to the forum and have read nearly every thing I can in two weeks
about EV and the Metro conversions. I'm extremely jazzed. I bought a forklift last Saturday.

I have some Motor questions and their must be some calculation spread sheets out there some where.

What I'm looking for is a EV motor calculator;

I have looked at the EV calculator at EV Calculator and its great but it doesn't have an area for curb weight and an unbranded motor.
  1. Given the curb weight of a vehicle how many HP would be needed to move it to 45 MPH? in say 20 seconds?
  2. Given the HP needed what is the optimum voltage?
  3. Given the voltage and HP how many amps are required for 20 mile range?

For example I have a motor the name plate says 9.2 Kw 45 VDC. On a web conversion site it says the motor is 12.3 HP, but is that at 110VAC?


The forklift came with a GE EV-1 controller 36-84 V rated that some one is running at 96 VDC. The controller is capable of 600 Amps.

I guess what Im really asking is will the motors I have work well at 96 VDC with the EV-1
And at what curb weights so I have a choice of donor vehicles like Nissan Sentra, BMW or Metro.

I would really Like a Trooper or 86-7 Jeep Cherokee.

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Old 04-14-2009, 03:59 PM   #2 (permalink)
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Quote:
Originally Posted by lurch View Post
For example I have a motor the name plate says 9.2 Kw 45 VDC. On a web conversion site it says the motor is 12.3 HP, but is that at 110VAC?
No, because it's a motor for VDC, not VAC.
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Old 04-14-2009, 04:42 PM   #3 (permalink)
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just so you know... HP is to kW like Mile is to Kilometer. You converted 9.2kW (metric rating) into 12.3HP (imperial rating). They are both a measure of Power, aka rate of energy usage.

I also want some surefire way to calculate all that crap. Never sure where to start.

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