Quick answer
The practical explanation
Production depends on system size, location, roof direction and pitch, shade, weather, equipment, and system condition. A trustworthy estimate should use the specific home and clearly explain its assumptions.
What to know
Three points to keep in mind
- Review at least a year of electricity use before sizing a system.
- Ask what shade and degradation assumptions are included.
- Compare estimated annual kWh, not only the number of panels.
For your home
A site-specific answer still matters
Solar results and service needs depend on the roof, equipment, shade, household electricity use, utility requirements, and the condition of the existing system. Use this guide as a starting point, then have the property and equipment evaluated before making a major decision.
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Authoritative references
This article summarizes general consumer information and is not tax, legal, insurance, engineering, or utility-rate advice.