Quick answer
The practical explanation
Possible causes include higher household use, seasonal production, fixed utility charges, export-credit rules, a system that offsets only part of usage, or a performance issue. Compare utility consumption, solar production, and the proposal’s assumptions over the same period.
What to know
Three points to keep in mind
- Solar production and household consumption are different measurements.
- New appliances, vehicles, or occupancy can raise electricity use.
- A high bill does not by itself identify whether the solar system has a fault.
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.