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1-Trickle charging for items like cellphones and car batteries 2-On roof solar panels
Keep in mind that solar being "green" is highly debatable. When you factor in the manufacturing and lifespan, the product is actually rather volatile. Most of this is because the components and manufacturing is pretty egregious when added to the equation. Sorry to be the wet blanket, but "green energy" is mostly a myth and statistical manipulation. In order of efficiency for generation of power 1-Nuclear, 2-Hydrogen, 3-Petro. The efficiency and environmental impact of consumer solar is pretty bad. (bring flame if you want, my data is via a PHD nuclear physicist)
I would still buy one tho..lol.
Remember that solar panels tend to advertise results via best possible light. They test in direct sunlight (perpendicular) on a clear day. I quote " 3 amps overall under direct sunlight. 21 watt SunPower solar array is 21.5-23.5% efficient" is pretty sad to me. Someone check my math (?):
My iPhone charger is 120v @ .15amp. watts = volt x amp. So 120 * .15 = 18 watt. So your linked product is like charging your DeWalt via iPhone charger (a little better, not much).