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Solar panel Characteristics

STC - Standard Test Conditions

Refers to a solar panel’s electrical performance when tested at industry recognized parameters of 1000 W/m2 irradiance, air mass = 1.5, and cell temperature of 25°C. Selecting the STC radio button applies a correction factors to the user’s input solar panel performance. This adjusts the performance inputs to a level that is more representative of an actual field installation. These corrected performance values are used by Franklin’s Solar Selection software during array sizing. Note: STC values are the most commonly found on the manufacturer’s data sheet and the product nameplates.

NOCT - Normal Operating Cell Temperature

Refers to a solar panel’s electrical performance when tested at the solar panel manufacturer’s defined Normal Operating Cell Temperature. Normal Operating Cell Temperature (NOCT) is commonly defined to be between 46-48°C. NOCT conditions are most commonly defined as 800 W/m2 irradiance, air mass = 1.5, wind speed = 1m/s, and ambient temperature 20°C. When the NOCT radio button is selected Franklin’s Solar Selection software applies no correction factor to the user input solar panel performance during array sizing.

Solar Hours


Select peak month for sizing or use annual average value.


Solar Array Tracker used.

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