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The amount of solar energy available is determined by the number of photons that reach the photo voltaic cells, and whether these photons the energy of electrons in motion thus creates an electrical current. The number of photons or amount of sunlight that falls on your solar cells must be determined to see the number of cells or solar panels you need for the solar system. This energy will differ depending on your latitude, season, and cloud your area can be expected.
What are the methods for the determination of solar energy?
Two factors that are considered following the angle of your solar panets Sun and the number of sunshine hours available in the place of residence. This combination is expressed in insolation and is calculated as the average luminance is measured in kilowatt-hours per square meter per day. Solar radiation of 1000 watts per square meter is the standard for energy from the sun at noon in midsummer. Typically, solar irradiance measured in the number of kilowatts per square meter per day, so if you can in the sun to be up to 8 hours and always at the highest power, solar radiation will be 8 ..
Solar radiation will vary considerably during the year, especially in northern latitudes. For example, Chicago would be illumination of only 1.6 in January, but it will be 6.1 in June, and the average is 4.0. This means that the solar panels in December at 70% less than in June. Closer to the equator, we see that similar numbers for Phoenix in January were 3.0 and 7.8 in June, an average of 5.5 per year. If you are looking for using the grid of your solar system should be 2-3 times higher than required numbers of June. Values for a place easily accessible on the Web because NASA weather satellites were to obtain these data around the world for many years.
You can plan your calibration Irradiance Using your language.
If we know how many kilowatt we require to meet the energy needs of our house, we are now in a state the size of our system. If we plan a grid tie system you can use to calculate the average luminance, since the aim is to make your payment in the energy companies zero in the whole year. If, however, you need self-contained system, you will need to use the value of December for radiation, and the system will have excess capacity for most of the year.
If you divide your needs in day-light, you get the number of watts your system needs to generate. Nets tied a house in Phoenix using 20kW per day divided by the average illuminance of 5.5 required to create 3600 watts per hour. After that, the system can be divided into the power output of your PV panels to determine the number of solar panels required. For our example, if the panel is 150 W, you will need 24 solar panels.