Ok, so my plan is/was to build a 90’s 2wd Toyota pickup into an EV. My requirements are:
[ul]
[li]Top speed of 65-70 (not super important, as long as it’ll do at least 55)[/li][li]Get me to work, and back (12 miles each way)[/li][/ul]
Sounds easy, right? Well maybe, maybe not… There is a 1,200’ elevation change one way on my commute to work (it’s downhill to work). There is a 2.5 mile grade that is 10-11%.
In talking with EVA I got the following proposal:
2008 JULY ELECTRIC VEHICLE CALCULATIONS
SMALL TRUCK PREPARED BY
ELECTRIC VEHICLES OF AMERICA, INC
(603) 569-2100
VEHICLE DESCRIPTION SYSTEM DESIGN
INITIAL CURB WEIGHT (LB) 1. MOTOR FB1
FINISHED VEHICLE WEIGHT (LB) 4200 2. BATTERY T125
DRAG COEFFICIENT 0.4 3. 20 HR RATE 235
FRONTAL AREA (SQ FT) 20 75 AMP RATE 125
TIRE SIZE C FACTOR 0.99
RR RADIAL TIRE 0.01 4. VOLTAGE 144
REV/MILE (HIGH GEAR) 900 5. MOTOR EFF 0.88
6. DRIVE EFF 0.9
******************************** ******** ******** ******** ******** ********
RESULTS OF HP ESTIMATED RANGE (MILES)
CALCULATION REQUIRED MIN AVG MAX
(BASED ON 20 MPH - 10% GRADE) 28 17 34 190
******************************** ******** ******** ******** ******** ********
SPEED (MPH) 3 6 9 20 15
------- ------- ------- ------- -------
DRAG (LBS) 0 1 2 8 5
ROLLING RESISTANCE (RR) 42 42 42 42 42
TRACTIVE FORCE (0% GRADE) 42 43 44 50 47
PER CENT GRADE FORCE + Tf
0 42 43 44 50 47
0.05 252 253 254 260 257
0.1 462 463 464 470 467
0.15 672 673 674 680 677
WHEEL TORQUE, FT-LBS ******* ******* ******* ******* *******
0 39 40 41 47 44
0.05 235 236 237 243 240
0.1 432 432 433 439 436
0.15 628 628 629 635 632
REQUIRED MOTOR HP ******* ******* ******* ****** *******
0 0 1 1 3 2
0.05 2 4 7 15 11
0.1 4 8 12 28 21
0.15 6 12 18 40 30
CURRENT REQUIRED (AMPS) ******* ******* ******* ******* *******
0 2 4 7 18 12
0.05 13 26 40 91 67
0.1 24 48 73 164 122
0.15 35 70 106 237 177
AVAILABLE MOTORING TIME (MINUTES) ******** ******** ******** ********
0 4577 2254 1468 569 821
0.05 758 373 245 102 141
0.1 409 200 130 52 74
0.15 278 134 86 33 48
CALCULATED RANGE(MILES) ******** ******** ******** ******** ********
0 229 225 220 190 205
0.05 38 37 37 34 35
0.1 20 20 19 17 18
0.15 14 13 13 11 12
******************************** ******** ******** ******** ******** ********
With a 144v system using the FB1-4001A and 24 T-125 batteries, it would take 28hp to sustain 20mph up a 10% incline. Since the motor only has 30hp, it just isn’t going to cut it. I’d get run over by a logging truck. Edit - I need to be able to do 45mph to be safe.
So what can I do? I have a truck bed (and under the truck bed) and I’m not afraid to use it for plenty of battery.
Ideally, I’d LOVE to be able to drive the truck from work to the next town over for errands which is about 20 miles from work and also very hilly, and back, and then go from work back home another 12 miles. Of course I can charge from both work and home.
Any ideas or help is appreciated. Thanks!