Because the seasons and weather conditions affect the amount of sunlight hitting your roof and the amount of sunlight also varies on the time day you can t use just the solar panel ratings to predict how.
How much sun does my roof get.
My goal is to wake up with the sun each day to get my body s circadian rhythm synchronized with daylight based zeitgebers help me get better sleep.
Additionally available sunlight varies by location.
The nrel national renewable energy laboratory has some excellent solar maps 5 to determine average daily sun rays across the united states.
How much sunlight does your roof get on average.
The rooftop temperature results from two different properties.
The ability of the material to reflect the sun s energy back into the atmosphere called solar reflectance and the amount of heat the material rejects instead of absorbs called thermal emittance both are measured on a scale from 0 to 1 with higher scores translating into cooler roofs.
After all 40 of your solar production comes during the winter so summer is not the only season that matters and your shade may be vastly.
Project sunroof is a solar calculator from google that helps you map your roof s solar savings potential.
Your roof needs to get enough sun as we said above to power your solar panels.
This brief equation shows how sunlight and a solar panel s specifications turn into the amount of power generated.
Understanding how much sunlight falls on a home s roof can help a homeowner make decisions about roofing materials insulation and the placement of solar panels.
We add in local factors and compute your home s sun number score that will range between 0 100.
Suncurves tells me when the sun will get up tomorrow.
Better still do it a few times throughout the year.
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So i set myself a bedtime alarm for visible sunrise minus 9 hours to ensure i am getting a solid 8 hours of sleep each night.
Sun number measures your roof calculating the pitch orientation and size of each roof plane.
You need a sunny roof to benefit from solar panels but yours may be sunnier than you think.
A roof s angle though has less impact on panel performance than the direction it faces.
Calculating the amount of sunlight.
Google s project sunroof gives building by building details and now has data for parts of all 50.
Top production occurs when solar panels face south a tilt angle of 30 to 45.
Sun number calculates the amount of solar radiation for every square meter of your roof.