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6. How do the panels work? A solar

panel (module) is made up a number of solar cells. Solar cells are generally

made from thin wafers of silicon, the second most abundant substance on earth,

the same substance that makes up sand. To make the wafers, the silicon is heated

to extreme temperatures, and chemicals, usually boron and phosphorous, are

added. The addition of these chemicals makes the silicon atoms unstable (their

electrons less tightly held). When photons of sunlight hit a solar panel, some

are absorbed into the solar cells, where their energy knocks loose some of the

modified silicon's electrons. These loose electrons are forced by electric

fields in the PV panel to flow along wires that have been placed within the

cells. This flow of electrons through the wires is electricity, and will provide

power for whatever load we attach (a calculator, a light bulb, a satellite,

etc.) Because solar cells are modular, a system's size can be increased

(or decreased) over time, according to need.

7. Are there any applications for photovoltaics where I don't need

batteries? The simplest and least expensive PV systems are

designed for day use only. These systems consist of modules wired directly to a

DC appliance, with no storage device. When the sun shines on the modules, the

electricity generated is used directly by the appliance. Higher insolation

(sunshine) levels result in increased power output and greater load capacity.

And when the sun stops shining, your appliance stops working. These

simple systems are an appropriate, cost-effective option for loads operated only

during the daytime. Examples of day use systems include: Remote water

pumping with a storage tank. Operation of fans, blowers, or circulators to

distribute thermal energy during the day for solar water heating systems or

ventilation systems. Stand-alone, solar-powered appliances such as

calculators and toys. It is also possible, in a utility grid

interconnected system (see below), to do without batteries, as such a system is

essentially using the grid as its storage device. http://ping.fm/zsk5w