Short circuit current (SCC) is the maximum current a photovoltaic module produces when the positive and negative terminals are directly connected with zero resistance. Typical residential modules generate SCC ratings between 9-12A under standard test conditions (STC) of 1000 W/m² irradiance and 25°C.
Temperature and Light Effects
Short circuit current increases approximately 0.06%/°C as cell temperature rises, making it the photovoltaic parameter most responsive to heat. Higher irradiance also increases SCC proportionally. A module rated 10A SCC at 25°C produces about 10.6A at 45°C. Installers must account for this in cable and breaker sizing to ensure conductors handle worst-case current scenarios per NEC 690.8(B)(1).
System Design Application
SCC values determine the amperage rating for DC-side breakers, disconnects, and conductors. When multiple strings connect in parallel, the total SCC becomes the sum of individual string currents. A system with six strings rated 10A SCC requires components rated for at least 60A. Proper breaker selection prevents nuisance trips from normal operation while protecting equipment from faults.