Monday, February 3, 2014

I'm confused with the whole 'electric car mpg' thing?




John


I want to get an electric car (Something like a Chevy Volt) when I move out of my parents house but a while ago but my father said that after you run the car for a while and the car switch to gas to provide movement that the gas will keep reduce the mpg until it is basically nothing.

To make it a little more clearer, lets say you buy an electric car and, after the battery dies, it gets 250 mpg then maybe 1 year later it only gets 50 mpg.
Is that true? I'mma pissed if that's true...



Answer
The Chevy Volt (and all the other plug in hybrids) basically uses the same system as a freight train. Basically its got an electric motor that drives the wheels, powers your radio, steering, A/C, etc. Of course at some point the battery will drain to the point where the motor no longer works. Then a small engine turns on and recharges the battery. The engine is used only as a generator and doesn't power the car. The electric motor is the only thing that car drive the car.

In the Volt the battery can hold enough energy to move the car 40 miles and the gas engine never turns on. At this point the battery is drained and needs to be recharged so the engine turns on to charge it or you stop and plug the car in.

Electric Car Charging using a portable generator?




JD


Assuming I could pack a portable battery charger into my yet to be purchased Nissan Leaf, would it be possible to charge said Leaf using a portable generator?

MY LOGIC IS AS FOLLOWS:
*It takes household 110V 15A outlet about 16 hours to charge the Leaf (according to their website).
*110V x 15A by my calculations equals 1,650 watts.

I know it is crazy, but indulge me: What kind of generator would produce that kind of continuous wattage?

SPECIFICALLY, when you see a generator that advertises, say, 3,300W peak, but will run maybe 16 hours on 4 gallons of gas at 50% load, what does that mean?

Does it mean that you are getting 1,650W output out of just 4 gallons of gas for 16 hours? If that is true, then it would stand to reason that those 4 gallons used to charge a 100 mile battery would equate to 25 miles a gallon. Just a mental exercise. I am not really going to do it, but I am curious.

Thanks,
John
ADDED DETAILS:
I appreciate your answers, but some of you are missing the spirit of the question. I know 25mpg is not good. I am only viewing the generator as a once in a blue moon option, ie when you get stuck with no charging stations and do not wish to call a tow truck. It would be used maybe once or twice a year maximum. It is just a fun mental exercise, so don't over think your answers.
Thanks-John



Answer
Yea, like 25 mpg sucks especially if it can't even pass the clean air emissions standards. A polluting car with low gas mileage, who would want to buy that? For the same price, buy a Prius and get 50 miles per gallon. My Prius gets 49 mpg if I drive it 70 miles per hour and I can get 52 mpg if I keep the speed down to 60 mph.

Everybody is talking about plug in EV cars, so here's simple calculation. At 1.65kW for 16 hrs that comes to 26.4 kWh. All the comparisons are for $0.10 per kWh for the electricity, but nobody ever mentions that in California with PG&E the top rate for residential is $0.44 per kWh and when you burn 1.65kW, you are at that rate plan. So that works out to $12 for the 100 miles. Which BTW works out to again 25 mpg with gas at $3 per gallon. So you cut a deal with PG&E for a smart meter to get lower electric rates during non-peak of say $0.20 per kWh. But here's the catch, if everyone plugs in their car at night, then that becomes the peak time and since they need to charge that rate due to the peak demand, then you are screwed.




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