Economy is booming with offerings from various Photovoltaic module vendors. It requires a great deal of detailed information to keep track and to ‘separate the wheat from the chaffing’. As in the summer of 2010, TEC again tested eight panels of renowned photovoltaic system manufacturers to research the low-light performance of individual panels for three months in autumn 2011. This time of year the sun is at a low altitude and the global irradiance is significantly weaker than in summer. As before, again the study took place on top of the roof in realistic conditions. Determining objective test results in laboratory tests under artificial light conditions would only have a limited validity. Basic requirements for realistic metering were maintained: TEC operates its own meteorological station with temperature, air pressure, wind speed, rain and humidity metering as well as a pyranometer for measuring the global irradiation (total solar irradiance impinging a horizontal reception area on the surface of the earth). This is how the weather situations could be read precisely and compared to the ascertained capacity and thus shows an objective test result of the realistic power yield from the different panels. At a benchmark test the PV module type ANTARIS AS M 190 reached top grade level of 99.5% regarding the highest energy yield per single panel and proved to be test winner.
* acc. manufacturers data (printed on each panel) and STC
ANTARIS AS M 190:
The PV module with the highest energy yield
** The readings of eight panels of various renowned manufacturers lasted thru the autumn months within the time period of September 1st, 2011 until November 30th, 2011. All module types were connected in separate strings of each two or three modules of the same type, depending on the level of the module voltage and the MPP voltage of the inverters. Each string fed in the grid via ‘Mastervolt Soladin 600’. Voltage and power were measured from the modules in an interval of one minute. Thereof we ascertained the DC power and the electrical energy from the modules and computed the supplied electrical energy. The AC grid fed-in energy of each pair of panels was acquired via a feed-in meter. All panels were operated without shading and aligned exactly south at an inclination angle of 30 degrees during research. Accurate same lengths of all strings implied another vital criterion. As previously mentioned, the operating range of all strings involved remained within MPP of the inverters. Again this year, none of the tested PV modules reached 100% performance. One ranged within proximity, two were close and only 5 got very close.
The ANTARIS SOLAR ASM 190 panel with a mono crystalline cell type generated an energy yield of 265.8 kWh/kWp (this implies 99.5% energy yield of the expected 100%). The comparison to competitive panels of four other manufacturers which also merit top grade level “very good” but remained closely beneath the energy yield of ANTARIS SOLAR ASM 190, are displayed on the diagram on the front and the chart on the reverse side.