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Monday, March 07, 2011
Tesla Recharge Cost?
14 comments:
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Steve_in_CA said...
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From the site referenced: "Model S costs about $4 to fully charge"
If electricity at the basic rate is $0.07 / KWH, then $4 / $0.07 = 57 KWH. If your generator is 3500 Watts (3.5 KW) then it will take over 16 hours to charge. Your generator should list the gallons per hour. You do the math there. -
3/7/11, 3:29 PM
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Rodger the Real King of France said...
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I don't do math. Guess.
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3/7/11, 3:48 PM
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Steve_in_CA said...
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What is the GPH of your generator? If it is 1 GPH then the cost is 16 * $4.00 a gallon = $64.00
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3/7/11, 3:59 PM
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Anonymous said...
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Rodger, I am not a scientist but I took physics in 1969 and back then Bro. Gourdian told us that energy flows down hill. So I figure any time you use an energy source (gasoline) to generate another energy source (electricity) you loose energy or else the perpetual motion machine would have been invented by al gore long ago. The exception you could argue is the sun but it will eventually burn out also or so we are told.
george -
3/7/11, 4:20 PM
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Anonymous said...
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Electric cars are Cola or nuke powered cars...
RAK
WV: Sperk sold 362 Volt cars, barley a sperk. -
3/7/11, 4:30 PM
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Anonymous said...
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Three battery options are offered: 160-, 230-, or 300-mile range. Model S comes standard with the 160-mile range battery at the quoted $49,900 base price (after the $7,500 Federal Tax Credit). The 230-mile and 300-mile range batteries are optional upgrades. The 300-mile option is priced at about $20,000 more than the base.
From this we can infer that the basic 160 mile battery pack is about $23,000
Based on testing, Tesla expects the battery to retain approximately 70% of its initial capacity after seven years or 100,000 miles. Average energy usage per mile is approximately 300Wh/mile.
300 x 160 = 48000Whr. for 160 miles =>
48,000 Watt-hr/3500 Watt = 13.7hr to charge.
Briggs & Stratton 4,800 Watt Generator; run time = 12 hours at half load, 4 gal tank; assume 6 hrs full load => 2/3 gal/hr.
2/3 gal/hr. x 13.7 hr. = 9.14 gal gas
160 miles/9.14 = 17.5 mpg gas equivalent using a generator
Gas equivalent @ $3.29/gal = $.188/mile fueling a generator for charging
Electricity here in Virginia is ~ $.1055/kwhr => 48 x .1055 = $5.06/160 mile = $.032/mile
The high power wall connector for four hour charging at home is an additional $1950.
Looks like this thing beats the crap out of Govt. Motors' Volt, but somebody else can do the battery replacement/declining performance/future value calculations to decide whether this is a good thing or a Green Wet Dream.
Lt. Col. Gen. Tailgunner dick -
3/7/11, 5:55 PM
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Anonymous said...
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Due to the conversion loss at your generator, about 50-100% more than if you just ran it on the gas. Home generators are not very efficient.
Using a home gasoline generator to charge an electric car is about the most inefficient use of energy for transportation I can imagine! NOW, if you had a diesel generator and ran it on waste oil, it wouldn't be any more efficient but it would be free. I really want to get one and use waste oil to power our air conditioners.
AWM -
3/7/11, 7:59 PM
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Rodger the Real King of France said...
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Fable:
Chicken wings - worthless
After "Hot Wings: - #$2.89 lb.
Used cooking Oil - pay to have it hauled away
After: ..... guess. -
3/7/11, 8:44 PM
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Cheesy said...
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I like the statement that an electric car doesn't necessarily have to look like a toaster.
Other than that, meh. -
3/7/11, 10:44 PM
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Leonard Jones said...
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This is a complicated question. If you want to rip out the batteries and
use the generator to power the car, you would need a generator capable
of supplying the maximum current consumed by the car.
Assuming DC drive motor/s, you would also need to replace the batteries
with a large power supply. Herein lies the problems:
The slow charge is probably accomplished by feeding 110 or 220v single
phase current into a small onboard power supply (Charger.) The optional
$1,950 charging station supplies DC current at much higher levels than
the AC option.
The AC option is a dead end. The car would consume power faster than
the small built-in power supply could provide. No math necessary here.
Option B: Throw the batteries in the trash and Install a big ass power supply
capable of supplying maximum current demand, and install a generator capable
of supplying 110 or 220vac at current levels sufficient to power the car with
with the pedal to the metal.
The problem with power supplies, is that there are crap-loads of inefficiencies
involved. A lot of the energy is dissipated in the form of heat in the transformer
and associated circuitry.
The quest for a perpetual motion machine is at least 500 years old. In the physical
universe, getting “Something for nothing” is a fools errand. Not knowing how
much current the car consumes, my best guess is that the fuel consumption of a
generator / power supply approach may come close to the 35-40 MPG limit of
internal combustion engine powered car, but it cannot be less.
My advice: Hold out for the Holy Grail of lib-tards and tree huggers: A car powered
by unicorn farts. The wait will be shorter! OK, maybe the problem is not that hard
after all:
1. What is the maximum current demand by the DC motor/s?
2. Find a DC power supply with the proper secondary DC voltage and current levels.
3. What is it’s AC input voltage and current ratings? (110 or 220vac at x vdc output)
4. Size the generator accordingly.
5. Does the size / weight of the P/S and generator make the project impractical?
6. Does the weight exceed that of the batteries and internal P/S?
7. If so, how does this effect the HP to weight ratio and the cars performance
Characteristics? I will leave that to a mechanical engineer, as I am but a
lowly electrician. -
3/7/11, 10:45 PM
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Kristophr said...
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It's a coal powered car. Which isn't a bad plan, since the US is the world's "Saudi Arabia" of coal reserves.
Add more nuclear plants, and it gets cheaper.
Home generators are not as efficient as large power plants, so gals/hr from them is a poor comparison.
I'll believe the numbers once it gets on the road in force. Numbers by the designers are there to meat design goals, and may not reflect reality. -
3/8/11, 3:02 AM
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Anonymous said...
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Inefficient use of power. How about 24/7 solar power:
Last year Spain was paying so much for solar generated power that a solar provider ran generators to shine lights on their solar panels to sell "clean" energy to the gov.
They were making a profit!
RAK
WV; catlevi- -
3/8/11, 10:31 AM
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Anonymous said...
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Electric cars are Cola or nuke powered cars...
Ahah!!! The famous Pepsimobile. -
3/8/11, 1:06 PM
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Kristophr said...
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Bah. If it was a real cola powered car, it would run on RC Cola.
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3/8/11, 1:17 PM
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