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The kilowatt size of the solar panel array is the total DC
kilowatts that the solar system could produce under Standard Test
Conditions (STC). This is know as STC DC kilowatts and most solar
systems are defined by this STC wattage since the solar panels are
marketed by this definition of power. Note that there are many ways
of defining the power produced by a solar system such as PTC, CEC
and CEC AC. Also note that there is 1000 watts in one kilowatt.