different laptops take different amounts of power. and they only use that amount of power when they are charging and running.
so if you charge it with it off it doesnt take as much, and then run it on a full charge till it runs low. then its more like 10-40 watts, and it fluctuates...but this all depends on the kind.
its all roughly around the number you quoted. my older laptop was way better, than my newer (used- free) laptop..
that little
solar charger is very very cool =) i am going to check it out better.
i wonder though how much power you could get from it, and how much power you need. for lots of continual use i would go with something much bigger. i've had something like that, not
solar, but a portable small unit that you fully charged via dc or ac and that hardly gave me much electricity, an hour or two.
i've actually been looking around at these sorts of things too....they seem to be getting better and cheaper.
but i would (and have- am writing this on solar power) go for a regular solar panel (s), possibly a battery bank, and an inverter or portable power unit with built in inverter.
if you want it small, just one of these portable power units and a panel. the ones you listed, well i am checking them out, but i dont think thats a great deal, unless you really need it tiny, and dont need very much power.
like this:
http://www.amazon.com/Schumacher-XP2260-Instant-Portable-Source/dp/B004EIAADG/ref=pd_sbs_auto_3
i have this one:
http://www.amazon.com/Duracell-DRPP600-Powerpack-Starter-Emergency/dp/B009YR00MI/ref=pd_sbs_auto_2
which is basically a xantrex product, they manufacture it...so umm...
http://www.amazon.com/Xantrex-XPower-Powerpack-Portable-Source/dp/B000E6LEIC/ref=cm_cr_pr_product_top
(sorry cant find the best ones right now =) that arent unavailable)
and also this:
http://www.amazon.com/Tekkeon-MP1580-TEKCHARGE-Battery-Charger/dp/B006FXUS1C/ref=sr_1_1?s=automotive&ie=UTF8&qid=1352394912&sr=1-1&keywords=tekkeon+battery+power+usb
which wont charge a laptop but i use this all the time. my speakers and mp3 player can run on this for days, and this gives the solar a break so it can recharge.
and then small three panels, which are directly connected to a battery. which is connected to a few more batteries...and then the portable power unit/inverter is connected to the last battery via the jumpstart cables. theres different ways you can do it...and you can add in a fuse, or a charge controller....but i havent. you could for portability skip the batteries, and just wire the solar panel right to this. at least with mine you can. it would be like that one product, but a LOT more power.
i got all the batteries free, theres places that you can get used batteries and some of them really arent great or usable, but most of them are still usuable. usable, maybe not ideal...but usable for this purpose. and FREE =)
it charges up in the car lighter socket when i went somewhere, or at my neighbors on ac...for the times when it got really low and not much sunshine.
you can also connect these things to a solar panel through the ac port, you make the plug (its not that hard!)...but then you cant use it while it charges.
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