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?
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:
- You can use a 24V system and then get a DC-DC inverter (24v to 19v), OR you can use...
- 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":
Hope you'll find this answer useful.