The chart shows the average daily insolation on a tilted surface for each month of the year. Potential sunlight reaching the tilted surface varies based on its direction and slope, the time of day, and the time of year.
Tip
Move your device to vary the direction and tilt to see how the light changes.
What does it tell me?
- How the amount and intensity of sunlight varies based on time of year
- How the direction and slope of the surface affects the potential sunlight received
- e.g. how much light will a sloped driveway receive across the year?
- e.g. how much light may fall through a skylight in a sloping roof?
Note: the chart does not account for shade from structures or objects (e.g. buildings or trees) or cloud cover.
Insolation is a measure of the power of sunlight reaching a surface. It is usually given for a period of time, e.g. per hour, per day, per month.
Insolation for a tilted surface the sunlight potential based on the direction, or aspect, which the surface faces and its angle of tilt above horizontal.
A surface facing directly toward the sun receives higher insolation than any other orientation. However, as the sun moves across the day and through the year, the insolation reaching a tilted surface varies widely.
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