Opencircuitjännite

Opencircuitjännite, often abbreviated as Voc, refers to the maximum voltage a photovoltaic (PV) cell or module can produce when no electrical load is connected. This condition, known as open circuit, means that no current is flowing through the device. It is a fundamental parameter used to characterize the performance of solar cells and is typically measured under standard test conditions (STC). STC are defined as an irradiance of 1000 W/m², a solar spectrum of AM1.5, and a cell temperature of 25°C.

The opencircuitjännite is an important metric because it represents the inherent voltage-generating capability of the solar material. It is directly influenced by factors such as the band gap of the semiconductor material used in the solar cell, the intensity of incident sunlight, and the temperature of the cell. Higher illumination levels generally lead to a higher Voc, while increased temperature tends to decrease it. Understanding Voc is crucial for determining the potential power output of a solar panel and for designing the electrical systems that will be connected to it, such as inverters and charge controllers. While Voc itself does not represent the power output (as no current flows), it sets an upper limit on the voltage that can be achieved.