Here is an example, using the solar light tops you want to use:
Voltage TIMES Current is the wattage ... so the little solar cells lights have 2.2 volts at 0.03 amps, that is 0.066 watts , run it for 1 hour and you have 0.066 watt/hr
Now lets think of something to try powering like a common standard 60 watt light bulb everyone knows , how many solar top panels do you need?
That happens to be 0.5 amps at 120 Volts = 60 watts
so you would need about 30 of these solar lights all wired in a series , that will make 120 Volts DC @ 0.03 amps = 3.6 watts
you need 60 watts for the Bulb, so you need 17 of these 30 in series strings
Grand total would be 17 TIMES 30 or 510 of this solar lights to power a single 60 watt load
Or you can go buy a 65 watt solar panel for 357.00
http://store.solar-electric.com/kykc65wasomo.htmlvs your build it yourself with solar light for ~1.30 each or 663.00, plus you have to assemble everything
All your answers an in this post ... if your confused, just keep reading it over and over and you'll get you answers