A 15kW solar system is a large residential or small commercial system, and its daily power output depends on how much sunlight it receives each day. Let's do the math:
To estimate daily energy production, we use:
Power = System Size × Average Sunlight Hours
Assuming you get 4 to 6 hours of full sun per day (an average range for many areas in the United States):
15kW × 4 hours = 60 kWh/day
15kW × 6 hours = 90 kWh/day
Thus, a 15kW system will generate 60 to 90 kilowatt-hours (kWh) per day on good days.
Compute monthly and annually by multiplying by time:
Monthly: 60–90 kWh/day × 30 days = 1,800–2,700 kWh/month
Annually: 60–90 kWh/day × 365 days = 21,900–32,850 kWh/year
Your own numbers will differ depending on your location, panel orientation, tilt, and shading.
As a reference point, the typical U.S. household consumes around 900–1,000 kWh per month. So a 15kW system can serve:
A 15kW solar panel system can shave — or completely eliminate — your electricity bill quite significantly, especially in places with a lot of sunlight.
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