The energy produced by a photovoltaic varies according to the panels and the materials used to make it, the latitude of the area 's installation, orientation, tilt over, of course, the weather, seasonal, daily and any shadows.
For example, a square meter of photovoltaic module in northern produces 135 kWh per year, if made with monocrystalline silicon, polycrystalline silicon with 110 kWh and 70 kWh with amorphous silicon. These are average values. The actual production of a photovoltaic may vary slightly (even on a more or less 10%) from year to year and from site to site depending on the season and the microclimate.
For maximum yield of materials is necessary to study the solar radiation in the area to prepare the appropriate slope and exposure. In general, the optimum angle is 30 °. It 'also important that there are no trees or buildings that create shade on photovoltaic panels, thus compromising the yield.
The power of a photovoltaic is expressed in kWp (kilowatt peak), ie in the maximum power that the plant can produce at standard conditions of sunlight.
In Sardinia and Sicily have their photovoltaic panels higher yield decreasing by about 10% in South-Italy, 15% in Central Italy and 20% in North Italy.
Despite these statistics do assume that the largest number of photovoltaic systems is located to the south, the data revealed that the show the Lombardy region of Italy with the highest number of kWh installed.
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