[Stoves] TEG geat idea / Li ION recup small idea

[Frans Peeters]

Dear Crispin,

 

  Indeed a labtob charger is 20V DC 3,5 A charging current  for 3,8 Ah ,but
the battery is14,8 Volt .

But between charger and cells you have 20 cm2 chips inside the battery and
and 30 cm2 in the PC 
.So supper uPcontrol and secret design !

DELL P/N75UYF contains 8 cells=4 times 2 paralel so 14,8:4=3,7 volt.

Put all 8 in paralel and 3,7 V will run your ideal 24 LEDs licht like
HÜffner Germany with regulator inside ,intended for 3X1,5=4,5  volt

Charging was indended in Africa with 1 sun cell of 3$ limited with zener to
4,2 volt

PC controler use 4,28 V charging / cell .Puls only at the end . An emty cell
needs soft start charging 0,5 A for 10 minutes .followed by 2h at 1,5 A .

LEDs design current is important,less the voltage !! Can be adapted with a
serie resistor like 56 ohm for 6 leds . Find the value with a current meter
and potentiometer .

 

Regars

Frans

 

  _____  

Van: stoves-bounces at lists.bioenergylists.org
[mailto:stoves-bounces at lists.bioenergylists.org] Namens Crispin
Pemberton-Pigott
Verzonden: donderdag 2 februari 2012 16:54
Aan: Stoves
Onderwerp: Re: [Stoves] TEG geat idea / Li ION recup small idea

 

Dear Frans

 

The charging voltage for a great many laptops is 19-21 volts for a 6 cell
Li-Ion battery.

 

Is it fair to say that it is safe to charge one cell with 4.2 volts, with an
operating voltage of 3.2?

 

3.2 is enough to fire most HE-LED’s though many of the packaged units use
3.5 (for full brightness of white HE-LED’s).

 

19/6 = 3.2 (only) so perhaps 4.2 is a bit high. Are they using a pulse width
modulated chopper to increase it to 25.2 as the charging voltage, or
something else?

 

I recall some battery packs are charged as 2 parallel sets of 3 in series,
but power is drawn as 6 in series. Those were 12 VDC input. Now they are all
19.2 or so. The one I use has a 9-cell and it is probably 3 sets of 3 in
series when charging.

 

Breaking out the cells from an old laptop is a safe thing to do and probably
some cells are better than others. In previous discussions here we have
noted that an old (almost dead) cell phone battery can run 3 LED’s for a
couple of weeks. ‘Dead’ to a phone or laptop is not at all dead to a light,
especially the newest high efficiency small white ones.

 

Thanks for your continuing advice and enthusiasm.

 

Regards

Crispin

 

From: Frans Peeters [mailto:peetersfrans at telenet.be] 
Sent: Thursday, February 02, 2012 9:03 AM
To: Stoves 
Subject: TEG geat idea / Li ION recup small idea

 

Dear RON LARSON ,

 

  With KNOW HOW
., a smal idea can become a geat idea for Africa !

The World is over full with LAPTOPS and weak powerpacks !

DELL :It contains 8 Li ION cells of 3,7 volt  3,5Ah

And regulator prints inside -------> secret !!

80% of this broken or wasted packs can be used for head lichts and home
lichting , with 24 LEDS;

 you get one week lichted evenings !

You put all the cells in paralel .

And charge by sun with a 10x5 cm sun panel end limit the voltage on 4,2 Volt
like ZX4,2 zener diode

Not more, for explosion danger .

It contaains Fluorinated ether !!!

 

 (For the laesy and  fortunated
. :www.CONRAD. de    could sell rechargeable
Lithium ION cells ! Not to find in a shop . )  

 

Regards

Frans .

 

 

 

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