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Old 08-25-2012, 10:24 AM   #21 (permalink)
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I think it takes 3-3.5X as much electricity to make hydrogen equivalent to just using the electricity to power an EV directly. By that measure, a kilogram of hydrogen is about equivalent to 100kWh of electricity.

I wish I owned a practical hydrogen powered car -- I could park it next to my unicorn!

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Old 08-25-2012, 02:35 PM   #22 (permalink)
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Quote:
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I wish I owned a practical hydrogen powered car -- I could park it next to my unicorn!
I am SOOOOOO jealous.......you own a unicorn!!!!!!!


Post pics!!!!
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Old 08-25-2012, 05:00 PM   #23 (permalink)
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Old 08-25-2012, 06:57 PM   #24 (permalink)
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Water electrolysis is horribly inefficient.
Driving an electric vehicle 30 miles should use about $15 worth of power unless you live in a really screwed up state that over charges for electrical power for no reason, like california.
To go 30 miles on water split hydrogen it would be more like $40 or $50 worth of power.
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Old 08-31-2012, 10:02 PM   #25 (permalink)
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Quote:
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Driving an electric vehicle 30 miles should use about $15 worth of power unless you live in a really screwed up state that over charges for electrical power for no reason, like california.
I'm glad I live in Arizona. I can drive my 4 liter V-6 Mustang 30 miles on less than $5 worth of gasoline (at this point in history, anyway). I must be doing something really wrong....
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Old 08-31-2012, 10:59 PM   #26 (permalink)
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Opps that should have been $1.50 worth of power.
Still takes many dollars worth of electrical power to split 2KG of hydrogen, up to $50 for 30 miles worth of hydrogen still stands.

Altho if you factor the cost of a new electric vehicle that you dont drive much in it could be far higher than $15 a mile.
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Old 12-20-2012, 01:59 AM   #27 (permalink)
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Quote:
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What would really be interesting to see would be hydrgen powered car, even from a tank of compressed hydrogen, with the engines characteristics optimized for the fuel. That would be cool.
BMW did such in 2007

BMW Hydrogen 7 - Wikipedia, the free encyclopedia

They gave one to the company that I was working for at the time (which was about 1 mile from their HQ in Germany) According to Wikipedia, it got a whopping 4.7mpg on H2-on a 6.0L V12
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Old 12-20-2012, 08:03 AM   #28 (permalink)
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Quote:
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BMW did such in 2007

BMW Hydrogen 7 - Wikipedia, the free encyclopedia

They gave one to the company that I was working for at the time (which was about 1 mile from their HQ in Germany) According to Wikipedia, it got a whopping 4.7mpg on H2-on a 6.0L V12
Weight was seriously increased due to the H2 tank, which also reduced the trunk quite a bit.
The tank wouldn't even fit a smaller-sized vehicle without taking up all of the boot space ...

H2 in compressed, cooled state has never been a serious contender for use as a car fuel, nor will it ever be.
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Old 06-08-2013, 01:57 AM   #29 (permalink)
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I was thinking about using my 5.6kW DC array for generating some hydrogen. I have no idea how to safely compress and store it, and how to use it for fuel. I have 2 large graphite rods, but I'm not sure of a good way to attach the copper wire to the rods. At the very least, I could catch it and maybe send up some balloons.
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Old 06-08-2013, 10:01 AM   #30 (permalink)
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Mr. Holmes wins the prize for hydrogen transportation effieiency. Blow up enough balloons to get you airborne, AND RIDE THE WIND TO THE OTHER SIDE OF THE PLANET.

Great mileage on your solar powered balloon car.

regards
Mech

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