Solar Panel Symbol
Definition: The Solar Panel symbol represents a photovoltaic module drawn as a rectangular grid with two output terminals (+ and −), denoting an assembly of solar cells connected in series and parallel that converts sunlight into direct-current (DC) electrical energy, as governed by IEC 61215 (crystalline silicon PV modules) and referenced in IEC 60617 system-level schematic conventions.
Also known as: PV panel symbol, photovoltaic panel symbol, solar module symbol, PV module schematic symbol, solar array symbol.
What the Solar Panel symbol means
The Solar Panel symbol represents a complete photovoltaic module — an array of silicon solar cells encapsulated and framed — that produces usable DC power when exposed to sunlight. Unlike the single solar cell symbol (which represents one junction at 0.5–0.6 V), the solar panel symbol represents a commercially rated module typically producing 18–40 V at its maximum power point and rated at 50 W to over 500 W under standard test conditions (STC: 1000 W/m², 25°C, AM1.5 spectrum). The positive terminal represents the output of the last cell in series and the negative terminal represents the return path.
In photovoltaic system schematics, the solar panel symbol is the generation source element, feeding current into charge controllers, MPPT converters, or directly into solar inverters. Multiple panel symbols drawn with series connections (positive of one to negative of next) represent a 'string', and parallel strings are combined at a combiner box before the inverter. The symbol allows designers to document PV system configuration, string voltage, and array power in a readable schematic format.
How to identify the Solar Panel symbol
The Solar Panel symbol is a rectangle with two internal vertical dividers and two internal horizontal dividers creating a 3×3 grid of cells, representing the multi-cell structure of a PV module. A single terminal stub exits the top center (positive, +) and another exits the bottom center (negative, −). The grid pattern distinguishes the panel symbol from a single solar cell (smaller grid or 'PV' label only) and from a battery (which uses long-and-short parallel line notation). The absence of text labeling inside the grid, combined with the cell-grid pattern, is the primary visual identifier.
Function in a circuit
A solar panel converts incident solar irradiance into DC electrical power through the photovoltaic effect occurring in each constituent solar cell. The module consists of 60, 72, or 96 crystalline silicon cells connected in series (and sometimes in sub-strings with bypass diodes), producing an open-circuit voltage (Voc) of approximately 20–50 V and a maximum-power-point voltage (Vmpp) of 18–40 V. Built-in bypass diodes across groups of cells prevent hot-spot damage when individual cells are shaded. A junction box on the module's rear provides the positive and negative output leads used as the symbol's terminals.
Standards: IEC vs ANSI
| IEC 60617 | IEC 61215-1 and IEC 61215-2 define design qualification and type approval testing for crystalline silicon terrestrial photovoltaic modules. IEC 61730 covers PV module safety requirements. IEC 60617 does not assign a unique graphical symbol for a PV module; the convention is a rectangle with a cell grid and +/− terminals as shown in IEC system-level PV diagrams. |
|---|---|
| ANSI/IEEE 315 | UL 61730 (harmonised with IEC 61730) and the NEC Article 690 govern solar panel installation in North America. ANSI Y32.2/IEEE 315 does not define a unique PV panel graphical symbol; a labeled rectangle or grid-rectangle with +/− terminals is the accepted US convention. |
| Key difference | No glyph difference exists between IEC and ANSI representations for a solar panel block symbol. Both conventions use a grid rectangle with positive and negative terminals. IEC system drawings may additionally mark the module's STC power rating (e.g., '415 Wp') adjacent to the symbol. |
Terminals / pins
| Pin | Name |
|---|---|
| pos | + |
| neg | - |
Typical values
Typical residential module: Pmax 300–450 W, Vmpp 32–38 V, Impp 8–12 A, Voc 38–46 V, Isc 9–13 A at STC (1000 W/m², 25°C, AM1.5). Temperature coefficient of Pmax: approximately −0.35 %/°C. Standard module size: approximately 1.7 × 1.0 m (60-cell, ~400 W). High-power 72-cell panels: up to 550 W.
Where the Solar Panel symbol is used
- Residential rooftop solar installation diagrams showing panel string configuration and total array power
- Commercial solar farm single-line diagrams documenting string layout, combiner boxes, and inverter inputs
- Off-grid solar system schematics showing panels charging a battery bank via a charge controller
- Solar-powered irrigation and pumping system diagrams specifying panel count and string voltage
- EV solar carport designs documenting panel coverage area, string configuration, and inverter sizing
- Building energy management (BEM) diagrams showing PV generation alongside grid, storage, and load elements
Example
In a 6 kW string inverter system schematic, fourteen 430 W solar panels are connected in two series strings of seven panels each. The positive terminal of each panel connects to the negative of the next in the string, producing a string Vmpp of approximately 266 V (7 × 38 V). Both strings are combined at a DC combiner box before feeding the DC+ and DC− inputs of the solar inverter symbol.
Key facts
- The Solar Panel symbol represents a complete photovoltaic module assembly, with a positive (+) output terminal and a negative (−) return terminal, producing DC power rated at 50–550 W at standard test conditions (STC: 1000 W/m², 25°C).
- A typical 60-cell residential solar panel produces an open-circuit voltage (Voc) of approximately 38–46 V and a maximum-power-point voltage (Vmpp) of approximately 30–38 V.
- Solar panels are governed by IEC 61215 (design qualification and type approval for crystalline silicon modules) and IEC 61730 (module safety); North American installations additionally follow NEC Article 690 and UL 61730.
- The symbol is drawn as a grid rectangle (representing the cell matrix) with two center-edge terminals: + at top and − at bottom, matching the physical module junction box polarity.
- Multiple solar panel symbols wired in series (positive of one to negative of next) form a 'string' whose total Vmpp equals the sum of individual Vmpp values; strings wired in parallel at a combiner box sum their currents.
- Bypass diodes inside the panel protect against hot-spot failures when cells are shaded; they are typically shown as separate diode symbols in detailed cell-level schematics but are implied by the panel symbol in system diagrams.
- The photovoltaic panel symbol has two terminals: positive (pin id: pos) at the top and negative (pin id: neg) at the bottom, representing the p-side and n-side aggregate outputs of the series-connected cell string.
- Watt-peak (Wp) is the standard rating unit for solar panels, measured at STC. A 400 Wp panel delivers 400 W under standard test conditions of 1000 W/m² irradiance and 25°C cell temperature.
Diagrams that use this symbol
- solar panel wiring diagram
- solar panel connection diagram
- solar connection diagram
- solar panel setup diagram
- solar system wiring diagram
- solar system connection diagram
- victron wiring diagram
- solar panel circuit diagram
Frequently asked questions
What does the solar panel symbol look like in a circuit diagram?
The Solar Panel symbol is a rectangle with an internal grid of rows and columns representing the cell matrix. A positive (+) terminal emerges from the top center and a negative (−) terminal from the bottom center. The grid pattern distinguishes it from a single solar cell (smaller, labeled 'PV') and from a battery symbol (parallel long-and-short lines).
What does the solar panel symbol mean in a schematic?
The solar panel symbol represents a photovoltaic module — an assembly of solar cells that converts sunlight into DC electrical power. In a schematic, it identifies the primary generation source in a PV system, with the positive terminal feeding current into a charge controller, inverter, or battery bank and the negative terminal returning to circuit common.
What is the difference between a solar panel symbol and a solar cell symbol?
The solar cell symbol represents a single semiconductor junction producing approximately 0.5–0.6 V, while the solar panel symbol represents a complete module of 60–96 cells in series producing 18–46 V. The panel symbol uses a larger multi-row grid rectangle, while the single cell uses a smaller grid or 'PV' text label. In system schematics, the panel symbol is used for sizing and layout documentation.
What standard defines the solar panel symbol?
IEC 61215-1 and IEC 61215-2 define the design qualification and testing standards for crystalline silicon PV modules. IEC 61730 covers module safety. For schematic symbols, IEC 60617 does not assign a unique PV panel glyph; a grid rectangle with +/− terminals is the accepted convention in both IEC and ANSI/IEEE system diagrams.
What do the terminals on the solar panel symbol represent?
The positive (+) terminal (pin id: pos) represents the p-side aggregate output of the series cell string — the terminal from which conventional current exits the panel. The negative (−) terminal (pin id: neg) is the n-side return, where current re-enters the panel. These correspond to the positive and negative output leads of the physical junction box.
How many solar panels can be connected in series in a string?
The number of panels in a series string is limited by the inverter's maximum DC input voltage. For a 600 V DC maximum inverter, a string of 60-cell panels with Voc of 40 V can have up to 15 panels (15 × 40 V = 600 V). For 1000 V inverters, strings of 20–25 panels are common. NEC Article 690 and IEC 62109 both require the string Voc at minimum temperature to remain within the inverter's rated DC input range.
What is the polarity of the solar panel symbol?
The positive (+) terminal is at the top of the solar panel symbol and the negative (−) terminal is at the bottom, consistent with the convention that current flows from the positive terminal through the external circuit. Reversing polarity by connecting panels incorrectly in a string will short-circuit cells and can cause module damage or fire; bypass diodes inside the module provide some protection.
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