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Old 10-02-2013, 11:30 AM   #1 (permalink)
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hydrogen from solar

would it not be possible to extract hydrogen from water using solar panels at home and then compress it with a hydrogen compressor [the expensive bit] for use either as a fuel supplement or as a complete replacement to petrol.
dunno just a thought...

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Old 10-02-2013, 11:48 AM   #2 (permalink)
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Yes, you can do that. But, its horribly inefficient even though its renewable.

Solar PV is at most ~15% efficient, then you take the electrolysis efficiency hit, and I don't even know what that is, then you take the ICE engine hit on top of that which is probably around 20% efficient in normal use, and then add the compressing power on top of that. You're talking about a MASSIVE solar array to power a car. At least 5X the solar power vs an EV. You're much better off using that solar energy to charge an EV.

Edit, forgot another loss.
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Old 10-02-2013, 02:21 PM   #3 (permalink)
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There is no reason to make hydrogen from solar or own a hydrogen compressor unless for some reason you have a constant lavish over capacity of PV all the time.

The efficiency of a cold electrolysis rig is around 20%.

I calculated it will take more like 10 to 20 times the power to run a hydrogen from electrolysis car as opposed to an EV.
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Old 10-03-2013, 10:10 PM   #4 (permalink)
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Hydrogen sounds nice, but is not exactly so cost-effective in short to medium term.
http://fotolog.com/cripple_rooster - blog oficial: Hidrogênio: futuro do pretérito?

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