Computing Watt Hours Per Mile

I compute the watt hours per mile at 18 mph and 35 mph. At 18 mph, it was 223, and at 35 mph, it was about 250. Hurray! That's better than I thought it would be.

Category:

Autos & Vehicles

Tags:

• ev
• electric
• car
• watt
• hour
• hours
• mile
• motor
• controller
• dc
• series
• wound

[waynesb]

I need some advice. My '73 Bug has a 90v pack and Curtis 1221C controller. It doesn't send enough power to the motor to even start on a fairly gentle slope. How do I find my problem, and what instrumentation should I get?

[MPaulHolmes]

@waynesb Hmm... What voltage range is it? 72 to 120? That's weird! How heavy is your car?

[TalksWithDirt]

You and your wife are pretty amazing. I admire your walk.

[MPaulHolmes]

@TalksWithDirt Thank you!!!

[akai454]

Yes, I'd love to have a rechargeable hybrid, it's good to know these measurements. You said 250W/Hrs, per mile, does that mean 250 watts for an hour's worth of driving at that speed? Ok, Thank You, Take Care.

[MPaulHolmes]

@akai454 It's a measurement of the force it takes to keep the car moving at a given speed. From that you can figure out what the range will be at any given speed.

[akai454]

@evric2008 Hmmm, I've never really thought of batteries in that way before as a finite amount of energy, I've always thought of it as the battery can supply so much current at a point on it's discharge curve, I've always thought of batteries as variable, like if You leave the battery alone after it discharges and then try to pull some current, it will give some current. But thinking of it in that way gives it a finite amount of energy / time, that's more convenient, Thank You. Take Care.

[evric2008]

@akai454 Simply take your pack size in WHrs (say 20KWHrs pack = 20,000WHrs) and divide it by the 250WHrs/mile and this gives the figure of 80 miles to a flat battery pack or 64mile range taking you pack down to 20%.

[pooey1911]

You da man!!

[akai454]

@MPaulHolmes  Ok, smart, I understand now, it's the amount of power needed to plow through the air resistance at a certain speed. And yeah, You would be able to calculate an estimated range at any moment. Keep Kickin' Ass Man.

[MPaulHolmes]

@20RoyalSuperKing Yes! I'm going to find a good area that's flat and figure out the energy usage per mile at every speed.

[20RoyalSuperKing]

Will you be making a nice graph with power curves etc, this is getting really interesting. thanks for all the vids.