Estimate the solar capacity of your rooftop
This tool allows you to estimate the amount of electricity generated on your rooftop should you install solar panels on it. The tool is defaulted to values that would work for locations based in Singapore. The measured area should be rooftops only where the assumption is to pack the number of solar panels in a small area.
Note that this tool provides only a high level estimation.
electricity generated per year = rooftop area x module efficiency x average insolation x system performance ratio x 365
Steps
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Navigate the map to the location you want to measure. You can use toggle between map and satellite mode on the map in order to better see the area you want to measure.
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Click on the measure button. This sets the tool to measure mode and allow you to measure the area of your rooftop.
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Click on the first point on the map. Then click on the next few to set up the polygon that covers your rooftop. You can move the points around to adjust accordingly. Use the clear button to clear all the points and exit the measure mode.
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The area measured should be shown to your right. The amount of electricity generated per year is automatically calculated.
Parameters
The following are the parameters used:
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Rooftop Area. This is the area of your rooftop.
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Panel efficiency. This is the efficiency of the solar panels you might deploy on your rooftop. The value comes from the solar panel manufacturer and is typically between 0.15 to 0.22. The value 0.17 is chosen arbitrarily and you can change it accordingly.
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Average insolation. This is the average amount of solar energy that hits an area each day, measured in kWh/sqm/day. The value 4.284 hours is the average of 10 years between Mar 2009 to Mar 2019 as derived from https://power.larc.nasa.gov/docs/v1/
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System performance ratio. This is the average performance of the system. The value 0.85 is from the upper value given by the National Solar Repository of Singapore.