Defined term
Solar array tilt
Solar array tilt is the angle between the photovoltaic array surface and the horizontal plane.
Also known as PV tilt angle
measurement · Concept code GS-CONCEPT-036 · Last verified August 20, 2026
Evidence through 2025-09-25 · 1 source has no source-event date
Content modified 2026-08-20
Definition and boundaries
Definition
Solar array tilt is the angle between the photovoltaic array surface and the horizontal plane.
Definition claim verification: Verified August 20, 2026
In plain language
When comparing Solar array tilt, keep the unit, time period, measurement boundary, and underlying assumptions the same on both sides.
What it is not
It is not roof pitch unless the array is installed parallel to that roof surface.
Decision context
Why it matters
The production effect depends on location, azimuth, mounting, seasonal solar resource, shading, and whether the system is fixed or tracking.
Decision-context claim verification: Verified August 20, 2026
Information boundary
This page provides general educational context, not a site design, production guarantee, utility determination, contract interpretation, legal opinion, tax conclusion, or individualized financial advice. Verify property, equipment, utility, jurisdiction, program, and agreement details before acting.
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Learning navigation
Primary topic: Performance
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Primary sources
- U.S. Department of Energy: Solar Photovoltaic System Design Basics
Source event date not provided · Ontology accessed August 7, 2026 · Ontology verified August 7, 2026
- National Laboratory of the Rockies: PVWatts Version 8 API
Revision PVWatts API 8.0 · website 8.5.2 · Source event as of September 25, 2025 · Ontology accessed August 20, 2026 · Ontology verified August 20, 2026