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My DIY 10 hour external laptop battery pack - Page 2

post #11 of 16
Quote:
Originally Posted by FastMHz View Post

The solar panels finally arrived and I got to quick work installing them in my external battery pack.


First I wired them in series and soldered on wires to the tabs.


Then I scanned the actual panels and printed a life size template.


I taped the template to the case and using a utility knife and metal straight-edge, I cut out the hole as best as I could.


I don't think I did too bad, really. Cutting plastic isn't a particular specialty of mine rolleyes.gif


Panels temporarily installed to get an idea of final result.

Next step is to install a diode and wire the panels to the battery bank. Next update should be of a completed project!

holy hell...make me one for my acer laptop....i have to lug the charger around all day as its got an hour and a half of battery life.
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post #12 of 16
Thread Starter 
^ I wish I could! But the only reason I made one was because the batteries were free. To buy 24 quality 18650 lithium cells puts the cost of one of these at a couple hundred bigeyedsmiley.png There's also the issue of liability...you know, cause of fires and stuff.

Anyway, some final pics!!


Got the diode and wires ready. The diode prevents the batteries from discharging into the panels in the dark.


Diode soldered in and tested for proper current flow.


Final product!!

There is really only one thing left to do and that is to make the USB charge port accessible from the outside. Right now, it must be partly unzipped to access it.

Now if it would just get sunny so I can test the charge rate...
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post #13 of 16
I think you are very creative. I want something like this to charge my laptop. I have a RAVPower 15,000mAh and I am able to use it charge my cameras, phones, tablets and more. It would be great if I can have it charge on my laptop.
post #14 of 16
4w solar panels. That's ideal sunlight. Let's say for this purpose you have ideal sunlight whenever you want; don't even low-end laptops still use like 25-40w? It doesn't seem like it would offset anything unless you were sitting outside in the sun every time you use your laptop.
    
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post #15 of 16
Thread Starter 
Quote:
Originally Posted by thggew View Post

I think you are very creative. I want something like this to charge my laptop. I have a RAVPower 15,000mAh and I am able to use it charge my cameras, phones, tablets and more. It would be great if I can have it charge on my laptop.

That unit wouldn't charge/run your laptop for long as the 15,000mah is at 5v. That comes out to 75wh, which isn't very much for a laptop, but certainly plenty for phones and tablets. EDIT: Actually, that 15,000mah is probably at 3.7v which is 45wh. Chances are it's a single lithium poly cell with a boost convertor to get the 5v.
Quote:
Originally Posted by Strychnine69 View Post

4w solar panels. That's ideal sunlight. Let's say for this purpose you have ideal sunlight whenever you want; don't even low-end laptops still use like 25-40w? It doesn't seem like it would offset anything unless you were sitting outside in the sun every time you use your laptop.

The 4w of solar panels would take almost 2 days of direct sunlight to fully charge from dead. But that's not their intent. If the unit is sitting in sun and being used, the extra 4w trickling in just extends the runtime for the laptop. If the unit isn't being used, then the solar will slowly charge the battery bank. It's a good emergency power source in the event of massive grid failure or whatnot.
Edited by FastMHz - 3/18/14 at 6:11am
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post #16 of 16
HI i'm currently doing something like this, i have no solid background but i have some on minor circuit electronics from high school. I have a 120 watt laptop, i need to come up with a 20v 6amp or better power supply. I also want to make the batteries removable so i can charge them individually or replace them if needed.

I need some advice, my setup will be composed of 4 modules of 6 18650 batteries in series ( 21.6-25.2v per module) each module will be set in parallel to achieve the 6 amps (hopefully) and will be connected to a step Down DC-DC Buck/ Voltage Converter with these specs:

Input voltage range: 4.5-26V
Output voltage range:0.8-24V
Max output current: 12 Amp.

i will also be attaching a lcd display showing voltage and amps on the go so i will know the voltages. I intend to limit my individual battery voltage to aminimum 3.3v (3.3v X 6 = 20v) volts per cell since it's a step down voltage converter (does this make sense? i am only assuming i need to set my lower voltage output to 20v)

Do you think this will work? i am confident enough to do proper wiring and connections for this but i don't know if i need to put diodes, resistors, or anything of the sort within the circuit. I also do not know if my battery setup is correct. What module did you use as a voltage alarm buzzer, i'd like to get one also.

thanks,
Tristan
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