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The earth receives an average of 164 watts per square meter from the sun. This is the average spread over the world including poles and tropics, night and day. The energy in units used commonly in commerce (kilowatt-hours) would be about 45 millionths of a kilowatt hour per second per square meter.

More important is the calculation of how much usable energy reaches the ground where the energy could be put into use. At 40 degrees latitude (the rough middle of the US) during the 8 peak hours of the daylight, each square meter will receive about 4.8 kilowatt hours.

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13y ago
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12y ago

Averaged over the whole world: 164 Watts per square meter over a 24 hour day.

At 40 degrees latitude on a sunny summer day: 600 Watts per square meter.

At 40 degrees latitude on a sunny winter day: 300 Watts per square meter.

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Q: How much energy (watts) from the sun reaches every square meters of the earth?
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