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Storing wind-generated energy as gravitational potential energy? - Page 3

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Posted by jim on December 7, 2008, 4:46 pm
On 7 Dec, 15:42, meow2...@care2.com wrote:

mythhttp://www.wiki.diyfaq.org.uk/index.php?title=Lead_acid_battery_const ...

This is crazy.

I am far from an elfinsafetee fan.  So, OK  for a few-off cells by
someone technically competent - but on a 'home-industrial" scale? That
is idiotic.

It is bulk H2SO4 you would be playing with.  Have you ever had a
sulphuric acid burn?  Even a small spot stings like hell and it takes
weeks for the scar to heal.  Not to mention the mass of volatile ions
being spurted into the air   Could you be sure you could contain it
safely?  AND be sure no idiot tests the water with their finger....
Solve all those problems and you'd still have potential risks from
lead contamination of the househild environment.

Car batteries are surrounded by a rugged rubberised casing & sealed,
but even so cases have been known to split.

Have you calculated how much you need to store 10 to 20 KWhr (typical
household daily elec requirements excluding space heating)?  How much
space it would take?  And there is all the trouble of handling  a DC

However running a wind generator to heat the domestic hot water
directly might be feasible depending on the costs of suitable generator
(s).  That could store the generated energy quite nicely, but as with
all such schemes you would have to accept lack of hot water when you
need it most (eg during a run of windless mid-winter days with no
cloud cover).

It might be possible to extend such a scheme to space heating and to
charging electric car batteries, but same objections apply.  Even then
you'd find extensive costs when it comes to implementation,

Wind is popularly regarded as "free" energy.  But it is no cheaper
than the oil and coal lying free underground.  Just like for coal and
oil, spending starts when you start to build & run the infrastructure
to extract the energy.

Alas, an idiot's "don't try this at home" message needs appending to
the wiki article: as if anyone could be so stupid...

Posted by Grimly Curmudgeon on December 7, 2008, 7:05 pm
We were somewhere around Barstow, on the edge of the desert, when the
saying something like:

mythhttp://www.wiki.diyfaq.org.uk/index.php?title=Lead_acid_battery_const ...

Ah right; those thousands of people who are living off-grid with medium
to large battery banks must all be living in fear and trembling of
getting burnt or blowing up.
Hint: we're not all as stupid as you think we are.

Posted by jim on December 7, 2008, 10:47 pm

what constructed as shown in the wiki article?

If you mean properly a constructed robust and sealed lead acid battery
bank (as used in telephone exchanges) then no problem: but the poster
pointed at the wiki article as the way to do it.  He is welcome to the
experience - for as long as he can drag it out..


Posted by Neon John on December 7, 2008, 7:29 pm

(Can't believe I'm actually replying to this...)

Well, in the case of my house's UPS, that's 24 volts at 1000 amp-hours.  I got
the 20 AGMs as a matched but used set as scrap from an AVS electric bus
battery pack.

A good alternative is a 48 volt, 500 amp-hour fork-lift battery.  They're
recycled when they fail to run a whole shift.  That is, with most of their
life remaining.  Again, easily purchased for scrap value which is currently
about 5 cents a pound.

Well, this whole thread is silly and those of us who can do simple math are
just funning around.  Anyone who thinks that they're going to supply their
house with 20kWh of wind power on a daily basis cheaper than the utility power
is smoking something MIGHTY FINE!

My UPS is grid-charged and is here for the week-long outages we frequently
have in the winter up here in the mountains.  As far as hassles, there are
none.  The main UPS is over 15 years old and has never needed even its ears
scratched, much less any attention.  AGMs don't need attention and don't leak
acid so no corroded connectors to deal with.  I do look at it every so often
just to make sure all the lights that should be green ARE green but other than
that, it simply occupies some floor space in the basement.  BFD.

John De Armond
See my website for my current email address
http://www.johndearmond.com  <-- best little blog on the net!
Tellico Plains, Occupied TN
Beware the lollipop of mediocrity. Lick once and you suck forever.

Posted by z on December 7, 2008, 7:46 pm

Those forklift batteries are so freaking heavy you may as well use them as
the mass for the gravitational potential energy storage :)

You could charge the batteries till they were full and then use the lifting
on them as the diversion load

ha hah ha

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