Information on measurements
The measurements presented concern measurements made in the facilities of CRES, in coordinates 38oN and 23o 56'E. The measurements of meteorological data and characteristic values of PV modules come from the station of long-term testing of PV modules (information here ) while the measurements of PV stations come from the PV systems installed in CRES.
The measurements from the long-term testing station refer to the ambient temperature and humidity, the global horizontal irradiance, to the irradiance at the level of the PV panels (tilt 30o orientation approximately 20o W), as measured by a pyranometer and a reference cell of PV type (polycrystalline silicon), the wind speed at the location of the PV modules (does not represent the wind potential of the site), and the precipitation. Additionally, operating values from a PV module are included, such as the operating temperature, the short-circuit current, the open-circuit voltage and current and voltage at the maximum power point of the PV module. These measurements concern a PV module of polycrystalline silicon technology, οφ nominal power οφ 220W and nominal value of short-circuit current 8.2A and nominal value of open circuit voltage 36.67V.
The first of the PV stations concerns a system of 6.21kWp, at a tilt of 20o and orientation South, which is installed outdoors in the main building of CRES, with the PV modules installed so that they are also utilized as shading devices. The second system concerns a 4.845kWp system, at a tilt of 40o and a south orientation, which is installed in a parking lot of CRES. The above PV systems have been operating since 2003 and 2000 respectively.
The measurements presented in the charts refer to instantaneous measurements for a recent period (up to the last 30 days) and can be downloaded by the user, by clicking on the legend of the chart.