Energy Density Of Solar Panels

Power density is how much power can be derived from an energy source within a certain area measured in watts per square meter w m2.

Energy density of solar panels.

Solar power is pollution free during use which enables it to cut down on pollution when it is substituted for other energy sources. And what high efficiency panels are currently on the market. The power density of the sun s radiation on the surface of the earth is approximately 1 4 kw m 2. Currently the average price of a solar panel system install in the u s.

5 hours x 290 watts an example wattage of a premium solar panel 1 450 watts hours or roughly 1 5 kilowatt hours kwh. This means that you need a larger area of solar panels in order to produce the same amount of energy that a coal plant would. At the earth s surface the energy density is reduced to approximately 1 000 w m2 for a surface perpendicular to the sun s rays at sea level on a clear day 1. Research by imperial college london has shown that solar panel efficiency is improved by studding the light receiving semiconductor surface with aluminum nanocylinders similar to the ridges on lego blocks.

The best way to evaluate the price of a solar panel installation is in dollars per watt w. For the sake of example if you are getting 5 hours of direct sunlight per day in a sunny state like california you can calculate your solar panel output this way. The power density also varies with the 11 year cycle of sunspots. Power density of solar installations must also account for space between panels either for servicing in solar farms or for spacing between houses in rooftop solar installation.

Knowing that the earth s surface is equal to 5 1 billion sq. Not much power from a great energy a very useful parameter in order to evaluate how much the energy is worth is the power density also known as radiance that indicates the solar radiation per surface unit watt per square metre w sq m. Similar to comparing dollars per square foot when shopping for a home w helps standardize the cost of solar by showing the cost of solar on a per watt basis. This value varies slightly throughout the year but by no more than 0 1 percent.

We explore that and more with our breakdown of solar panel efficiency. The power density of solar panels is low compared to those of fossil fuels. This distance varies by about six percent throughout the year causing the power density to range from about 1 308 kw m 2 to 1 398 kw m 2. The efficiency of solar panels gives you an idea of how much energy your solar panels will be able to produce.

Additionally solar electric generation has the highest power density global mean of 170 w m 2 among renewable energies. The amount of solar energy that reaches the earth s surface after subtracting all the reflections and absorptions that take place in the atmosphere is equal to 85 000 billion w. How much energy does a solar panel produce. At the upper reaches of our atmosphere the energy density of solar radiation is approximately 1 368 w m2 watts per square meter.

One reason for this variation is the changing earth sun distance.