The first way to determine the cost of your solar installation is to determine how many photovoltaic panels you need. Most homes require 14 to 36 solar panels to fully cover their energy bill. The monthly peak hours of sunshine you receive tell you how many kWh of electricity 1 kilowatt (kW) of solar panels will produce in your area in a day. So, if your state receives 150 peak hours of sunlight per month, 1 kW of solar energy will produce 150 kWh of electricity per month.
Since you now know how much 1 kW of solar energy you will produce in your area, you can determine what size of solar system you need to meet your electricity needs. So, you know the size of the solar system you need to cover your energy consumption. What now? To find out how many solar panels you'll need, take the size of the solar system and multiply it by 1000 to convert the size from kilowatts to watts. The average solar installation will require between 335 and 405 square feet of roof space.
To find out how much roof space your solar system needs, simply multiply the number of panels you need by 17.55 square feet, which is the area of most residential solar panels sold today. The table below shows how many solar panels you need based on the size of the system, as well as an estimate of how much energy the solar panel will produce. A less “perfect” ceiling is also perfectly fine, although it needs more panels to meet energy requirements. Remember that you will probably need more panels than this figure, since they will most likely not get sunlight every day of the month.
The shade, direction and angle of the roof have a major effect on the amount of electricity your solar system generates. Several factors determine the number of panels needed for a 100% solar-powered home, including, but not limited to. The average, plus the number of solar panels you need, depends on several other factors, such as the location of your home and the type of solar panels you choose. You can run the air conditioner with solar energy, but for constant cooling, you'll need to have solar batteries installed or switch to the power grid during the night, as solar panels only provide power while they receive sunlight.
Therefore, even the most efficient panels may not generate enough energy if they are not exposed to adequate sunlight. Next, solar expert Will White discusses everything you need to know to find out how many solar panels you need to power your home. Cheaper solar panels save you money, but they generate less electricity per panel, which defeats the whole process. Estimates of solar panels are not included this time, because these climates can be found in many different states.
However, the only way to determine an accurate estimate of a solar system is through personal energy use. Many states in the north of the United States have dry climatic conditions with higher solar radiation compared to cities in the south. Assuming that your panels receive at least 6 hours of sunlight per day, that equates to about 250 watts x 6 hours of %3D sunlight 1.5 kWh of energy per day, approximately 45 kWh per month and 540 kWh per year.