Pannelli Solari Bologna

To check the bearings in the now vast landscape of manufacturers of photovoltaic modules is very useful for a comparison that gives an overview of the characteristics and significant numbers of the various modules sold on this site

Note

• The column with the values in bold, Watt at 60 ° C, the column is to reflect the temperature coefficient, in practice the true value and not to showcase, Watt Peak, this because the Standard Test Conditions (STC ) is 1000 watts per meter² of solar radiation and 25°C cell temperature, but in Italy even in winter the temperature of a black body as the cell exceeds 35 degrees or 40° C if you take into account the shortage of spare 'air that has an integrated facility on the roof pitch, it can be taken as the average working temperature of 60 degrees ° C, which is 35 more than the temperature of STC and multiplied by a coefficient of Pp% / ° C (Watt less for every degree centigrade more).
• Gives us the value In the column forms required for 19.8 kW we rounded to the nearest multiple of three, as 19 kW must be three-phase, and less than 20 kW to fall in the price higher incentive.
• The Sunpower U.S. 173 W / m² is the ferrari of the park forms, but the quality is very high expensive and it is intended for use where space is small, where space is a not problem agrees to terms with his own pockets

Voices from the world of professionals

• Voices of the corridor say that the Chinese forms very quickly fell 10-15 years
• Technology Hip SANYO has an advantage: the use of technology is amorphous silicon which Monocrystalline, with the result of recovering something on performances scattered light, then power up the first and last hours of the day, or in situations cloudy. It seems that the choice has not proved successyful because of the amorphous sanyo're already showing signs of premature aging with loss of power for the whole module.the real truth would be discovered only 15 years between

Note

• The column with the values in red, absolute convenience, the column is to reflect the temperature coefficient, in practice Watt at 60° C/Watt at 25° C (the greater this ratio the greater the convenience) multiplied for efficiency (W/m², the greater this ratio the greater the convenience), all divided by the relative cost €/W (plus it is small the value of the ratio the greater convenience) the all multiplied by the average life (most of the houses, though born of no more than 15 years, guarantees a yield of 80% after 20-25 years), and 0.80 plus 2 years of warranty equal to 0.82 . The result of this lucubrations is a spurious number (w²/m² x €) directly proportional to convenience. To understand better make an example: evergreen = 158/190 x 127.5 / 3.64 x 0.82 = 23.88 a number that by itself does not mean anything, but compared with the other gives us the absolute ranking of convenience .