A configured assembly of multiple photovoltaic (PV) modules electrically and mechanically arranged (series/parallel strings, mounting structure, wiring, optionally trackers and module‑level electronics) to convert incident solar irradiance into direct‑current electrical power for grid‑connected or off‑grid use; the array topology and site conditions determine operating voltage, current, mismatch losses and energy yield.

Principle

The electrical and mechanical configuration (module interconnection, orientation, tilt, shading, temperature and presence of power electronics) determines the array's operating point, vulnerability to mismatch and partial shading, and the mapping between irradiance/temperature and DC output; array performance is therefore a system property, not simply the sum of module nameplates.

Demonstration

Illustrative scenario → A rooftop PV array arranged as three series strings into a string inverter (Situation) → one module in a string becomes shaded midday (Recognition) → the string current is limited by the shaded module causing proportional loss across the whole string unless bypass diodes or module‑level MPPT are present (Action) → consequence: the array produces significantly less power than predicted by summing unaffected module ratings; yield forecasting and inverter sizing must account for shading and mismatches (Consequence).

Misapplication

Calling a single photovoltaic module an 'array' or assuming nameplate STC power equals field production. The semantic error is conflating rated single‑module performance under standard test conditions with real‑world array output which depends on irradiance, temperature, wiring configuration, and system losses.

Consequence

Array design choices affect inverter selection, conductor sizing, energy yield predictions, safety (disconnects, rapid shutdown), and code compliance; ignoring array‑level effects can produce undersized inverters, unexpected clipping, increased losses, or hazardous installation conditions.

Reversal

Module‑level power electronics (microinverters or optimizers) and tracking systems can decouple module outputs and mitigate string mismatch and shading losses, altering the traditional string‑based tradeoffs; in experimental or spliced lab arrays the definition still applies but performance scaling and safety requirements differ from engineered field arrays.

Boundary

Clearly within: fixed‑tilt rooftop arrays, ground‑mounted arrays with trackers, arrays with string or central inverters. Boundary case: a single module paired with a microinverter — electrically a minimal array but functionally treated as an array in system design. Clearly outside: single photovoltaic cells in the laboratory unassembled into modules or module‑level chips not intended for power delivery.

Semantic Tension

Energy yield optimization versus cost/complexity: increasing module‑level electronics or trackers improves yield and reduces mismatch sensitivity but raises capital, maintenance complexity and potential points of failure.

Synthesis

A photovoltaic array is an electrical‑mechanical system whose real output is determined by topology, site and balance‑of‑system choices; effective design treats the array as an integrated system rather than as a collection of independent module nameplates.