The Photovoltaic System

What is a kWh?
    A kWh, or kilowatt-hour, is a measure of electricity. It describes the amount of power (kilowatts) used over a period of time (hours).

    A 60-watt light bulb that is illuminated for one hour uses 60 watt-hours of electricity, or .060 kilowatt-hours. If it is illuminated for a half hour, the bulb will consume .030 kWh of electricity, or half as much. The average home consumes roughly 20 kilowatt-hours of electricity per day, or 600 kWh per month. Depending on size, time of year, and weather, SunPower systems can produce from 1 kWh to upwards of 10 kWh per day.

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Sunlight to Electricity

This one-minute animated video shows how a solar cell converts sunlight into electricity. (Note: early in the video, you'll hear the statement, "Every minute, enough of this [sunlight] energy reaches the Earth to meet the world's energy demand for a whole year." This statement is misleading if specific assumptions are not considered. A more accurate general statement is that "every hour enough of this energy...".)

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The Photovoltaic System

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