Defined term

Photovoltaic system loss

Photovoltaic system loss is a modeled or measured reduction between an identified reference energy and delivered photovoltaic energy attributable to specified loss mechanisms.

Also known as PV system loss

measurement · Concept code GS-CONCEPT-040 · Last verified August 20, 2026

Definition and boundaries

Definition

Photovoltaic system loss is a modeled or measured reduction between an identified reference energy and delivered photovoltaic energy attributable to specified loss mechanisms.

Definition claim verification: Verified August 20, 2026

In plain language

When comparing Photovoltaic system loss, keep the unit, time period, measurement boundary, and underlying assumptions the same on both sides.

What it is not

It is not one universal percentage applicable to every design or site.

Decision context

Why it matters

Loss categories, calculation order, overlap, period, reference boundary, and included inverter treatment must be stated instead of adding unrelated percentages blindly.

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.

Concept relationships

Affects

  • Annual solar productionPublished conceptPhotovoltaic system loss can affect how Annual solar production is evaluated

Primary sources

What to do next

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