How to Estimate the quantity of Solar Power Obtainable for Your House
How to Estimate the quantity of Solar Power Obtainable for Your House
Solar energy generated will be a function of how many photons from the sun hit your photo voltaic cell, and how many of these photons actually get an electron moving forward to generate a current. The quantity of sunshine(number of photons) that hits your photo voltaic panel is the determining factor in sizing your photo voltaic system and determining the number of solar panels needed. The Amount of solar power will be a function of the latitude, tree and cloud cover, as well as the season, and will differ considerably from area to area.
How can we Measure Solar Energy?
Solar power is a mix of the hours of sunshine and the strength of the sunlight you may expect at your location. Insolation defines the relationship and will be measured in kilowatt hours per square meter per day which is called irradiance. By definition, solar irradiance of 1,000 watts per square meter is what is predicted for midday in the middle of summer when the sun is highest. Normally solar irradiance is measured in the quantity of kilowatts per square meter per day so if it were possible for the sun to be up for 8 hours and always at the highest power, solar irradiance would be 8..
Solar irradiance will vary significantly during the year particularly in northern latitudes. For instance, Chicago will have an irradiance of just 1.6 in January, but it will be 6.1 in June, and the yearly average will be 4.0. This means that solar energy in December is 70% less than in June. Compare this to Phoenix where the irradiance is 7.8 in June and 3.0 in December or 5.5 for the year. If you are not tied to the power grid, this suggests your capacity has to be over 2.3 to 3 times the size that would be determined by June numbers. Values for your place are easily accessible on the internet because NASA's weather satellites have been compiling this information around the globe for many years.
You will be able to Plan your System Size Utilizing Irradiance for your Locale.
All we need to know is the electrical use in our home in kilowatts, and we can easily figure out the size system that we require. If we are planning a grid-tie system, you can use the average yearly irradiance for your calculation because the objective is to make our payment to your power company zero for a full year. If we are planning a off-grid system, we need to choose the irradiance value for December since we want to generate adequate electric power all year.
To compute the number of watts your system must generate, divide your daily electrical power required by the irradiance. For instance, if your house in Phoenix requires 600kw per month, or 20kw per day, your system would need to generate about 3600 watts per hour of full sunlight. You can then divide the system wattage by the output of your photovoltaic panels to figure out the number of solar panels required. For this home in Phoenix the system will require 24 solar panels rated at 150 watts.
Solar energy generated will be a function of how many photons from the sun hit your photo voltaic cell, and how many of these photons actually get an electron moving forward to generate a current. The quantity of sunshine(number of photons) that hits your photo voltaic panel is the determining factor in sizing your photo voltaic system and determining the number of solar panels needed. The Amount of solar power will be a function of the latitude, tree and cloud cover, as well as the season, and will differ considerably from area to area. How can we Measure Solar Energy? Solar power is a mix of the hours of sunshine and the strength of the sunlight you may expect at your location. Insolation defines the relationship and will be measured in kilowatt hours per square meter per day which is called irradiance. By definition, solar irradiance of 1,000 watts per square meter is what is predicted for midday in the middle of summer when the sun is highest. Normally solar irradiance is measured in the quantity of kilowatts per square meter per day so if it were possible for the sun to be up for 8 hours and always at the highest power, solar irradiance would be 8.. Solar irradiance will vary significantly during the year particularly in northern latitudes. For instance, Chicago will have an irradiance of just 1.6 in January, but it will be 6.1 in June, and the yearly average will be 4.0. This means that solar energy in December is 70% less than in June. Compare this to Phoenix where the irradiance is 7.8 in June and 3.0 in December or 5.5 for the year. If you are not tied to the power grid, this suggests your capacity has to be over 2.3 to 3 times the size that would be determined by June numbers. Values for your place are easily accessible on the internet because NASA's weather satellites have been compiling this information around the globe for many years. You will be able to Plan your System Size Utilizing Irradiance for your Locale. All we need to know is the electrical use in our home in kilowatts, and we can easily figure out the size system that we require. If we are planning a grid-tie system, you can use the average yearly irradiance for your calculation because the objective is to make our payment to your power company zero for a full year. If we are planning a off-grid system, we need to choose the irradiance value for December since we want to generate adequate electric power all year. To compute the number of watts your system must generate, divide your daily electrical power required by the irradiance. For instance, if your house in Phoenix requires 600kw per month, or 20kw per day, your system would need to generate about 3600 watts per hour of full sunlight. You can then divide the system wattage by the output of your photovoltaic panels to figure out the number of solar panels required. For this home in Phoenix the system will require 24 solar panels rated at 150 watts.
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