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From: Todd Montgomery <tmont@****.WVU.WVNET.EDU>
Subject: Economy for EVs
Date: Fri, 12 Mar 93 20:21:55 CET
Amonchare, I lost your post about Economy equations, Soooo I am
sending this out to everyone as a starting point for an answer for Mr.
Haydens comment that no proposals for Electric Vehicle (EV) Economies.

The below is experimental data taken from a REAL EV.

Car Type: FORD Escort XL Stationwagon Body
GVW: 3466 lbs.
Electric Motor: Advanced DC Motor FB1-4001
Continuous Horse Power 19.1
Peak Horse Power Developed 72
Operating Efficiency Range: 88-90%
Battery Pack: 24 Optima 800S Lead-Acid (3 strings of 96V each)
Storage Capacity 13.2 kW
Amp Hour Capacity 120 Ah for 1 hour
Weight: 945 (+,- 40) lbs. - I can't remember the exact weight.
Total Experimental EV Range: 38.5 miles - Trial 1
40.2 miles - Trial 2
35.6 miles - Trial 3
All trials were at 40 mph for the duration.

Now assuming This car really SUCKS, which it does. But it is 80+%
efficient. We calculated about 83%. A normal car is around 40%
efficient on average. Project that into the future. Say by 2053, gas
is 60% efficient? That is safe. And electric is ~90% efficient, and
improved electric being about 95+% efficient, then:


gas = (28000 / Mass) km/l
multi = (42000 / Mass) km/l

(From Mr. Haydens post)

electric might fit in here:

gas factor = 28000
gas factor = (.60 (60% efficiency)) * x = 28000
x = max power = 46667

multi = (y) * 46667 = 42000
y = 0.89999 (~90% efficient)

electric = (42500 / Mass) km/l
improved electric = (44300 / Mass) km/l

This make some sense?

-- Quiktek
a.k.a. Todd Montgomery

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