Conditions under which a module is typically tested in a laboratory: (1) Irradiance intensity of 1000 W/square meter (0.645 watts per square inch), AM1.5 solar reference spectrum, and (3) a cell (module) temperature of 25 degrees C, plus or minus 2 degrees C (77 degrees F, plus or minus 3.6 degrees F). [IEC 1215
Abbreviated STC, a set of reference PV device measurement conditions consisting of irradiance of 1 kW/m2, AM 1.5, and 25ºC cell temperature.
The environmental conditions (temperature of 73.4 degrees +/- 3.6 degrees F or 23 degrees +/- 2 degrees C; relative humidity of 90% or less; barometric pressure of 28 to 32 in. Hg) under which measurements should be made when measurements under any other condition may result in difference of opinion between a variety of observers at different times and locations
Atmospheric conditions of temperature and humidity in which laboratories agree to conduct tests, eliminating those variables in comparing results. (See also: Conditioning) Standard and special conditions include: Conditions Temperature Relative Humidity Standard 73ºF ± 2ºF (23ºC ± 1ºC) 50% ± 2.0% High Humidity 73ºF ± 2ºF (23ºC ± 1ºC) 85% ± 2.5% Cold Storage 40ºF ± 2ºF (4ºC ± 1ºC) 85% ± 2.5% Tropical 90ºF ± 2ºF (32ºC ± 1ºC) 90% ± 3.0
The testing conditions to measure photovoltaic cells or modules nominal output power. Irradiance level is 1 000 W/m², with the reference air mass 1,5 solar spectral irradiance distribution and cell or module junction temperature of 25°C.
A set of reference conditions used for PV device measurement. They consist of irradiance of 1 kW/m2, AM 1.5, and 25ºC cell temperature.
The environmental conditions under which measurements should be made when measurements under any other condition may result in disagreement between various observers at different times and places. These conditions are as follows: Temperature 23 degrees +or- 2 degrees C (73.4 degrees +or- 3.6 degrees F).
All solar modules are rated under these conditions: 1 kW/m2 of light, and cell temperature of 25ºC (77ºF). STC conditions are only reached in the real world in ideal solar locations like Taos on cool clear days. Some very high altitude sites at noon in mid winter can exceed STC conditions by up to 25%. (See also PTC)
A standard set of conditions used for comparing PV module performance. The conditions are: solar irradiation of 1,000 w/m2 and cell temperature of 25ºC. Abbreviated on this site as "stc", as in "Module Rating (DCstc)".
