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How do I build a solar powered charger for a laptop with dc rating 19v, 3.42A? I'd also prefer to use some other batteries to store the electricity? How can I accomplish this?

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This may be better suited for the Electronics Stack Exchange site –  Doresoom Apr 15 '11 at 14:15
    
Haven't you asked basically the same question 3 times? –  Jay Bazuzi Apr 15 '11 at 19:58
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A. You will need to calculate your Energy consumption estimations. Let say, for 5 hours a day of average laptop consumption (70W) you will need to produce 450-550w a day (that is 350w plus energy losses on conversion of voltage and losses of battery).

B. For this You will need: 1. Some kind of solar panels 2. A solar charger 3. A battery 4. An inverter

The specification of those element is depend on the strategy that you're planning to apply.

C. There are two basic strategies for planing this system:

  1. You can use a 24V system and then get a DC-DC inverter (24v to 19v), OR you can use...
  2. Mine preferred way, because the computer is a gentle electronic device, is to go through the transformer of the computer it self (that is, 220/110v AC to 19DC), as you can count on it to be accurate and stable for the computer and the internal battery system: use a 24/12v system with a inverter to normal appliance voltage in your region (220/110v) and plug the original transformer of the computer to the inverter.

You've a lot more to learn before i would recommend you to start spending money on materials.

You can read more here (cost 20$) - and I'm not getting paid for this. i don't even know the writer... i really do recommend this e-book, i have used it myself. and here you can find an full and detailed article i wrote about how to build a solar pv electric system, but it in Hebrew, so maybe try to Google-translate it.

And here two more good pieces of content, from "Instructables":

  1. http://www.instructables.com/id/DIY-Solar-Setup/
  2. http://www.instructables.com/id/DIY-Home-Solar-Planning-a-Solar-Array-Beginners/

Hope you'll find this answer useful.

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Awesome answer :) +1 for the links too. –  Simon Apr 15 '11 at 13:40
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