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Solar panels are devices that convert light into electricity. They are called "solar" panels because most of the time, the most powerful source of light available is the Sun, called Sol by astronomers. Some scientists call them photovoltaics which means, basically, "light-electricity."
A solar panel is a collection of solar cells. Lots of small solar cells spread over a large area can work together to provide enough power to be useful. The more light that hits a cell, the more electricity it produces.
All the VESTPAK™ models have USB cable connectivity "thru" the backpack from any solar panel you may choose. So that all your devices are recharging inside the backpack.
The average life expectancy of a solar panel is about 30 years. However, depending on the quality of the panel, the elements it's been exposed to, and how well it's been maintained, it might last well beyond the three-decade mark.
When a 12V solar panel is rated at 100W, that is an instantaneous rating, if all of the test conditions are met, when you measure the output, the voltage will be about 18 volts and the current will be 5.55 amps. Since watts equals volts times amps, 18 volts x 5.55 amps = 100 watts.