Defined term
Global horizontal irradiance
NREL SAM lists global horizontal irradiance as a weather-data element for photovoltaic modeling.
measurement · Concept code GS-CONCEPT-122 · Last verified August 28, 2026
Evidence through 2025-04-16 · 0 sources have no source-event date
Content modified 2026-08-28
Definition and decision context
Definition
NREL SAM lists global horizontal irradiance as a weather-data element for photovoltaic modeling.
Verified August 28, 2026
Why it matters
SAM's radiation-component settings determine which combination of global horizontal, direct normal, and diffuse horizontal irradiance data the detailed-PV model uses.
Verified August 28, 2026
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Learning navigation
Primary topic: Performance
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Primary sources
- National Renewable Energy Laboratory: SAM Help 2025-04-16, Weather Data Elements, p. 130 — Radiation Components and irradiance data
Revision SAM Help 2025-04-16 · Source event as of April 16, 2025 · Ontology accessed August 28, 2026 · Ontology verified August 28, 2026