Energy Density Of Solar Panels

And what high efficiency panels are currently on the market.

Energy density of solar panels.

The power density of the sun s radiation on the surface of the earth is approximately 1 4 kw m 2. Knowing that the earth s surface is equal to 5 1 billion sq. At the upper reaches of our atmosphere the energy density of solar radiation is approximately 1 368 w m2 watts per square meter. 5 hours x 290 watts an example wattage of a premium solar panel 1 450 watts hours or roughly 1 5 kilowatt hours kwh.

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. We explore that and more with our breakdown of solar panel efficiency. Currently the average price of a solar panel system install in the u s. The power density of solar panels is low compared to those of fossil fuels.

Additionally solar electric generation has the highest power density global mean of 170 w m 2 among renewable energies. Solar power is pollution free during use which enables it to cut down on pollution when it is substituted for other energy sources. 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. 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 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. As a result the highest power density achieved is around 20 w m 2 in desert solar pv farms whereas solar farms in germany generally achieve 5 w m 2. 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. But what exactly is solar panel efficiency.

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. 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. The most efficient mass produced solar modules have power density values of up to 175 w m 2 16 22 w ft 2. The power density also varies with the 11 year cycle of sunspots.

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

The efficiency of solar panels gives you an idea of how much energy your solar panels will be able to produce.