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Total area of land to power the world with solar energy - Page 9

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Posted by bradguth on April 9, 2007, 6:40 pm

That's OK because, you're so far off the mark anyway.  But thanks any
way for that global solar average that also of no improtance for the
vast bulk of potential area that can easily accomplish 1.5 fold that
much unless your big head is blocking the sun.

BTW;  the ocean is one nifty PV cell, isn't it.
Brad Guth

Posted by =?iso-8859-1?Q?Roland_M=F6sl?= on April 9, 2007, 7:10 pm

Imagine 2057 10 billion humans with a high living standard.
5 billion cars.

Complete beyond fossile energy.

But each car needs only as much photovoltaic as a
roof over the parking lot.

Just 50.000 km² needed for 5 billion cars.

And people will think about all this morons
promoting fossile energy like we think today
about doctors where phlebotomize had been
the only theraphy some hundered years ago.

Roland Mösl
http://car.pege.org  cars and traffic
http://live.pege.org  building and live

Posted by Eeyore on April 9, 2007, 7:14 pm

Roland Mösl wrote:

Those numbers make no sense.


Posted by Anthony Matonak on April 9, 2007, 8:45 pm
 Eeyore wrote:

I don't see any numbers but that doesn't mean we can't put some in.

: the average stall is about 325 square feet (30 m^2)

Daily insolation in the United States averages around 4.5 kWh/m^2/day
and PV efficiency in the real world is around 10%.

How much energy does that give us? Let's see...
4.5 kWh/m^2/day x 30m^2 x .10 = 13.5 kWh/day

How far can you go on 13.5 kWh/day? An electric car gets somewhere
between 3 to 6 miles per kWh these days. This means you could drive
40 to 80 miles a day.

: The average United States driver travels 29 miles per day

It looks like this is enough to cover the average driving in the
United States.


Posted by Shitbag Adulterer McCain on April 10, 2007, 4:43 am
 On Apr 9, 1:45 pm, Anthony Matonak

More like 5.5 kWh/day. People select the better locations to live and
eschew the darker places.

Efficiency is on average 13% after conversion losses to AC, 14% to 16%
as direct current DC which would be preferred for batter charging or
flow battery storage.

Bad numbers based on bad figures. 21,45 kWh/day.

It looks like enough to export surplus energy to deficit areas over
the grid.

European averages are annualized at 1700 watts/year/meter^2 instead of
the 2000 watts/meter^2/year of the USA. Shrink the 21.45 down by 15%
to 18.25 kWh/day for average EC (lower to the North, greater to the
south, of course).

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