Spangle Solar Power Information & Peak Sun Hours
Solar Green Energy Summary for Spangle, Washington
Lattitude: 47.4297
Sunlight
Fixed Tilt Sunlight Hours: 3.7 hours per day
1-Axis Tilt Sunlight Hours: 4.7 hours per day
2-Axis Tilt Sunlight Hours: 5.1 hours per day
Peak sun hours is one of the most important criteria to examine when considering installing a solar power system. Peak sun hours are different than total sunlight hours in a day because the strength of the radiation of the sun varies throughout the day. For example, during sunrise and sunset the solar insolation from the sun is less powerful than at noon. For a moment of sunshine to be considered a peak sun hour the intensity needs to be at least 1 kilowatt per square meter. This means that a square meter of your solar panel should be receiving 1 kilowatt of energy from the sun. This number is used because it is an amount of light that allows a solar panel to produce output efficiently and not under perform due to lack of sunlight power.
The equator has a latitude of zero while Spangle has a latitude of 47.4. Any city located on the equator will receive the most sunlight throughout the year because the sunlight arrives at a perpendicular 90 degree angle to the earth at the equator. The further you are from the equator the more your daily sunlight hours can vary.
The sun moves through the sky during the day, and changes positions in the sky throughout the year as the seasons change. A fixed solar panel remains fixed in position during this movement. So, although it is effective in capturing sunlight, a 1-axis or 2-axis panel can be more efficient. A 1-axis panel tracks the sun's movement throughout the day from sunrise to sunset. In addition to that, the 2-axis panel also accounts for the movement throughout the year.
Climate in your geographical region is a major factor that will influence average peak sun hours per year. If you live in a region that does not have a lot of completely sunny days, then cloud coverage will greatly influence solar insolation on any given day. Mountains and trees may also contribute to lower solar insolation if they block the sun from your panels at any given point of the day.
In Spangle you can look at the average peak sun hours of a fixed solar panel mount, which will be 3.7 hours. This number iis an estimate based on data of previous years. With a tracking mount in Spangle you could theoretically increase the amount of peak sun hours per with a 1-axis mount, and get 4.7 hours, or a 2-axis mount and potentially increase your average to 5.1 hours.