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Posted onJanuary 22, 2012 - 6:13 pm by Admin | 0 Comments

Solar power is produced by photovoltaic panels that convert sunlight to electricity. The power that a solar panel can produce is based on its size and material, on its orientation to the sun and on the amount of sunlight it receives.

How much energy does a solar panel produce?

When a solar panel is manufactured, it is tested under Standard Test Conditions (STC) which are equivalent to full sun at sea level at 25 degrees Celsius. The panel is then rated for the number of watts it produces under those test conditons. For example, a typical solar panel for a home system might produce 200 Watts. Five of these panels would then produce 1000 Watt, or one kiloWatt. When the sun shines on the one kW array for one hour, it will have produced about one kWh of electricity. If you have the equivalent of six hours of full sun in a day the array will have produced six kWh. This is the amount of energy you now have available to operate your electrical appliances.

The number of kWh you can expect the solar array to produce in a typical day, month or year in your area depends on the amount of sunshine you receive. Days vary in length with the seasons. Some days are cloudy. On overcast days the panels will only produce only 20 - 60% of their full rating, depending on the thickness of the cloud cover. These variations are taken into account by using climate data that provides the average solar radiation per day throughout the year. Just multiply the solar radiation by the panel rating to determine how much energy you can expect.


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