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"Stephen" <mcavoysAT@aolDOTcom> wrote in message
news:j2maj41q9grjmd39acovbqjgoq1sfi7i64@4ax.com...
>
> I guess that your place is cool in the summer.
>
Unfortunatly not. I have floor-ceiling windows on the side that faces ENE,
so I get full sun from sunrise to just before midday. Then there are smaller
windows on the other side (WSW) which catch the sun from about 4pm til 6.
On the second floor, so above most of the shading trees.
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On Tue, 2 Dec 2008 19:17:05 +0200, "Gail" <gail (at) sql in the wild (dot) co
[dot] za> wrote:
>
>"Stephen" <mcavoysAT@aolDOTcom> wrote in message
>news:j2maj41q9grjmd39acovbqjgoq1sfi7i64@4ax.com...
>>
>> I guess that your place is cool in the summer.
>>
>
>Unfortunatly not. I have floor-ceiling windows on the side that faces ENE,
>so I get full sun from sunrise to just before midday. Then there are smaller
>windows on the other side (WSW) which catch the sun from about 4pm til 6.
>
Where do those architects park their brains?
I have something similar in my flat. The living room has floor to ceiling
windows South and West. Hot in the summer and cold in the winter. Tut! Tut!
>On the second floor, so above most of the shading trees.
Do you live in the bush? :) Small trees, I'm on the forth floor and the trees
outside are about 10 feet higher than my window.
Come to think of it I did not see many tall trees in Nigeria except in the Delta
but then I was above them in a helicopter so it was hard to gauge the height.
--
Regards
Stephen
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On Tue, 02 Dec 2008 08:33:31 -0800, Darren New <dne### [at] san rrcom> wrote:
>Stephen wrote:
>> Li-ion batteries can be kept on charge all the time, I believe.
>
>More precisely, due to the complexities of charging Li-ion batteries without
>making them explode, the charger has to have enough smarts to know when to
>stop charging the battery even if it's plugged in. So you can leave them on
>the charger indefinitely, and the charger will stop charging them as
>appropriate.
I'm glad to hear that I'm doing the right thing.
--
Regards
Stephen
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Stephen wrote:
> On Tue, 02 Dec 2008 10:24:18 -0500, Tom Austin <taustin> wrote:
>
>> IIRC, Li-ion batteries do have a problem with building up a *resistance*
>> barrier inside. While researching batteries several years ago I ran
>> across some information, but I don't remember too much now.
>>
>
> From what I can remember, the internal resistance builds up due to age. Whether
> the battery is used or not.
>
A internal resistance may build due to age, but I think that is
different that what I am referring to.
>> If you follow a particular discharge pattern they will build up an
>> actual 'film' internally on an electrode. This would increase the
>> internal resistance of the battery. A lot of electronics detect this as
>> a dead battery and shut off accordingly. The problem is that the
>> battery still does have a good charge, just a higher internal
>> resistance. If you hook it up so that a current continues to be drawn
>> then the 'film' is burned off and the internal resistance decreases to
>> normal.
>
> You live and learn :)
> Again I did not know that.
It has been many years since I researched this information - I don't
know how accurate I am.
So don't take what I say as fact - only as something to chew on and do
further research on.
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"Stephen" <mcavoysAT@aolDOTcom> wrote in message
news:jkraj41muuer1ohs99d9v68d4jtc96k1uo@4ax.com...
>
> Where do those architects park their brains?
Wish I knew.
> I have something similar in my flat. The living room has floor to ceiling
> windows South and West. Hot in the summer and cold in the winter. Tut!
> Tut!
Yup. That sounds familiar
>>On the second floor, so above most of the shading trees.
>
> Do you live in the bush? :)
No. I live in a city.
> Small trees, I'm on the forth floor and the trees
> outside are about 10 feet higher than my window.
> Come to think of it I did not see many tall trees in Nigeria except in the
> Delta
> but then I was above them in a helicopter so it was hard to gauge the
> height.
The tallest trees around here come to about the top of my window. Pity
they're too far away to give effective shade.
The building is pretty high. The ground floor (which is a parking area) is
about 4 m high (a guess, I haven't measured). The floors aren't as high, but
my ceiling is 2.75 m above the floor (which really made curtains expensive,
and doesn't help with the temp in winter)
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On Tue, 02 Dec 2008 12:58:51 -0500, Tom Austin <taustin> wrote:
>
>A internal resistance may build due to age, but I think that is
>different that what I am referring to.
Yes, I agree it is different. I'd not heard of a film on the electrode before.
--
Regards
Stephen
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On Tue, 2 Dec 2008 20:20:51 +0200, "Gail" <gail (at) sql in the wild (dot) co
[dot] za> wrote:
>
>No. I live in a city.
Sorry Gail, I'm not a very literal person. I surmised that you lived in the city
from what you've said before. That was my idea of a joke, sorry.
>
>The tallest trees around here come to about the top of my window. Pity
>they're too far away to give effective shade.
>
Shame! They are so far away but then the upside is that they don't block your
view and you have something to look at.
>The building is pretty high. The ground floor (which is a parking area) is
>about 4 m high (a guess, I haven't measured). The floors aren't as high, but
>my ceiling is 2.75 m above the floor (which really made curtains expensive,
>and doesn't help with the temp in winter)
Ouch! But at least your room must be airy.
--
Regards
Stephen
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Stephen wrote:
> On Tue, 02 Dec 2008 12:58:51 -0500, Tom Austin <taustin> wrote:
>
>> A internal resistance may build due to age, but I think that is
>> different that what I am referring to.
>
> Yes, I agree it is different. I'd not heard of a film on the electrode before.
I was using the term 'film' because I lacked a better term at the
moment. It's a buildup of 'something'
I got curious and looked up a few sources
I'm not crazy - I actually found something.
apparently it is called a 'passivation layer'
http://www.spectrumbatteries.com/id6.html
http://www.electrochemsolutions.com/pdf/Passivation.pdf
http://www.bealecorner.com/trv900/battery/lithium.html
I believe it has to do with low current draw.
Low current does not burn off the passivation layer that forms, yet you
do not see much affect because the current draw is low and the internal
resistance drops little voltage.
But as soon as you need a higher current from a battery with a big
passivation layer, the voltage drops due to the internal resistance.
Most electronics sense the low voltage and indicate low battery and shut
off.
If they would stay on for a couple of minutes the passivation layer
would be burned off and the voltage would return to normal.
I don't know what 'chemistries' of Li-ion batteries have this problem -
apparently someone thought the SONY Infolithium batters did.
Tom
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Darren New wrote:
> Orchid XP v8 wrote:
>> Recipe...book...?
>
> Yeah. I think they had some ROM left over or something. Who would put a
> 50" TV in the kitchen, tho?
I just found a TV that also contains 6 famous paintings which you can
watch instead of watching TV... WTF?
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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On Tue, 02 Dec 2008 14:05:16 -0500, Tom Austin <taustin> wrote:
>
>http://www.spectrumbatteries.com/id6.html
>http://www.electrochemsolutions.com/pdf/Passivation.pdf
>http://www.bealecorner.com/trv900/battery/lithium.html
>
That was very interesting now I'm worried about the heat transfer from my CPU
core to the battery. :)
>If they would stay on for a couple of minutes the passivation layer
>would be burned off and the voltage would return to normal.
No big deal I suppose if you include a start up timer
--
Regards
Stephen
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