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Solar Laptop Charger

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Posted by beesh on May 7, 2009, 2:42 pm
 
All
Nice soltution for a Solar Laptop Charger .
http://www.solaritems.net/

Enjoy it.

Posted by David on May 10, 2009, 9:21 am
 
known  fraudulent trader takes your cash delivers nothing



Posted by Eeyore on May 10, 2009, 4:16 pm
 

beesh wrote:


They're a joke. A friend's Dad bought a PV solar panel to stop his car
battery self-discharging during periods of non-use. It couldn't even
manage that. I reckoned he needed 2 m2 of panels just to do that alone
throughout the year.

Graham


Posted by Guus W on May 11, 2009, 12:16 pm
 

Does this friends dad has a hummer with all the lights on? ;)

2 m2 panels gives more then 200wp or 16,6 amps at 12 Volts (when the sun is
shining)
Normal self discharge is (with european cars) not more then 0,1 Amps, so a
panel of 1,2 Watt is sufficient to compensate that.
A panel of 0,02 m2 would be sufficient (gives 2 watts - 0,17 amps)

Greetings


Posted by Eeyore on May 11, 2009, 2:25 pm
 

Guus W wrote:


And nothing when it isn't. In the UK here winter insolation falls as low as 0.5
kWh / m2 / day
http://www.apricus.com/html/insolation_levels_europe.htm
so a 15% efficient solar cell would generate 150Wh if 2 m2. That's 11.9Ah at
12.6V and about 0.5A averaged over the 24 hours of the day. OK, maybe 1 m2 and
250mA would do. Don't forget the car's electronics in additional to
self-discharge.



It didn't.


What for about half an hour a day ?

TOTAL insolation is what counts over a 24 hour period you twit.

Graham


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