Now, as with all of the Solar Pocket Instructables, this is the tricky part:Theory:
This step is the key -- combine solettes in series with a superglued shingling technique. Each solette, or any chunk of mono or polycrystalline PV silicon for that matter, outputs around 0.5 - 0.6VDC, which is not enough voltage to do very many useful things. So, we need to combine enough of these solettes together in series so that their voltage outputs add up.
In order to power the LiPo charge circuit, which then pumps current into the LiPo battery, which then charges your smartphone, we need to produce 4.8V - 6VDC from our homemade solar panel. This means we will need a minimum of 10 solettes in series (or, 5.0Vopen). The solettes we are using will output Im (or, the max current at the maximum power point of the cells - about max power point here: http://en.wikipedia.org/wiki/Maximum_power_point_tracking) of around 130-150 mA per solette. So, since we are combining the solettes in series, the voltages add up, but the current does not. Or, to put it another way, 10 of our solettes in series will output 5.0VDC and 130mA on a nice day in Osaka.
Back to the solettes: The (+) output is the grey underbelly of the first solette in your shingled stack. The (-) output of the series connected shingled lineup can be accessed either at the bus bar or white silver ink runners on the blue top surface of the final solette in your stack, or by using a "false" solette that doesn't produce electricity but just serves to bring do the top surface connections to a solette underbelly. This is the easiest and cleanest approach, and is worth the sacrificial solette. So, ignore what I wrote in the paragraph above -- you need 11 solettes if you are using one as a basic conductor.
What to do:
A few dabs of superglue (again, regular Crazyglue will worl, but breaks down at temperatures of 80C, so I recommend you use high temp cyanoacrylate available in the Solar Pocket Kits or online a number of places, including here
), a few seconds of pressure, and you've got yourself a solar series connection! Repeat 11 times.