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Definition of: Pane.

In building; a pane is a sheet of glass often framed with timber.

Definition of: Parallel Connection

In solar sytem design; parallel connection is the standard method of joining solar PV cells or photovoltaic (PV) panels / modules in smaller systems formed by connecting positive leads together and negative leads together; such a configuration increases the current, but not the voltage.

Definition of: Party wall.

In property; a party wall is a wall shared between two properties, such as is the case between semi-detached houses.

Definition of: Peak Demand/Load

In solar system design; peak demand/load is the maximum energy demand in a specified time period. e.g. The annual peak load might be winter, whilst the daily peak load might be 18.00 - 21.00.

Definition of: Peak Power Point

In solar PV manufacturing; the peak power point is a measurement of the operating point of a solar cell or photovoltaic (PV) panels / module where the product of the current value times the voltage value is at maximum.

Definition of: Peak Sun Hours

In solar system design; peak sun hours is the equivalent number of hours per day when solar irradiance averages 1,000 w/m2. For example, six peak sun hours means that the energy received during total daylight hours equals the energy that would have been received had the irradiance for six hours been 1,000 w/m2.

Definition of: Permitted Development Rights.

In property; permitted development rights are the things you can do to a property without planning permission. For example, extensions are allowed up to 15% of the size of the property.

Definition of: Phosphorous (P)

In solar PV manufacturing; phosphorous is a chemical element used as a dopant in making n-type semiconductor layers.

Definition of: Photon

In solar PV manufacturing; the photon is the elementary particle responsible for 'light energy' or electromagnetic phenomena. It is the carrier of electromagnetic radiation of all wavelengths, including in decreasing order of energy, gamma rays, X-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves.

Definition of: Photovoltaic(s) (PV)

In electrics; photovoltaics is the direct conversion of light into electricity.

Definition of: Photovoltaic (PV) Array

In electrics; a photovoltaic array is an interconnected system of PV panels that function as a single electricity-producing unit. The panels are assembled as a discrete structure, with common support or mounting. In smaller systems, an array can consist of a single solar panel.

Definition of: Photovoltaic (PV) Array Junction Box

In electrics; a photovoltaic array junction box is an enclosure where all PV strings of any PV array are electrically connected and where protection devices can be located if necessary.

Definition of: Photovoltaic (PV) Cell

In electrics; a photovoltaic cell is the smallest semiconductor element within a PV panel or PV module to perform the immediate conversion of light into electrical energy (direct current voltage and current). Also called a solar cell. Not to be confused with a solar thermal cell.

Definition of: Photovoltaic (PV) Conversion Efficiency

In solar PV manufacturing; photovoltaic conversion efficiency is the ratio of the electric power produced by a photovoltaic device to the power of the sunlight incident on the device. Different cells have different efficiencies, but come at different costs.

Definition of: Photovoltaic (PV) Device

In electrics; a photovoltaic device is a solid-state electrical device that converts light directly into direct current electricity. Solar photovoltaic devices are made of various semiconductor materials including silicon, cadmium sulfide, cadmium telluride, and gallium arsenide, and in single crystalline, multicrystalline, or amorphous forms.

Definition of: Photovoltaic (PV) Effect

In solar PV manufacturing; the photovoltaic effect is the phenomenon that occurs when photons, the "particles" in a beam of light, knock electrons loose from the atoms they strike. When this property of light is combined with the properties of semiconductors, electrons flow in one direction across a junction, setting up a voltage. With the addition of circuitry, current will flow and electrical power will be available.

Definition of: Photovoltaic (PV) Generator

In electrics; a photovoltaic generator refers to the total of all PV strings of a PV power supply system, which are electrically interconnected.

Definition of: Photovoltaic (PV) Module

In electrics; a photovoltaic module is the planar assembly of solar cells and ancillary parts intended to generate direct current power under unconcentrated sunlight. The structural (load carrying) member of a module can either be the top layer (superstrate) or the back layer (substrate).

Definition of: Photovoltaic (PV) Panel

In electrics; the term photovoltaic panel is often used interchangeably with PV module. More accurately used to refer to a physically connected collection of modules (i.e. a laminated string of modules used to achieve a required voltage and current).

Definition of: Photovoltaic (PV) String

In electrics; a photovoltaic string is a circuit in which PV panels are connected in series, in order for a PV array to generate the required output current and voltage.

Definition of: Photovoltaic (PV) System

In electrics; a photovoltaic system is a complete set of components for converting sunlight into electricity by the photovoltaic process, including the array and balance of system components.

Definition of: Photovoltaic-Thermal (PV/T) System

In solar system design; a photovoltaic-thermal system is a photovoltaic system that, in addition to converting sunlight into electricity, collects the residual heat energy and delivers both heat and electricity in usable form.

Definition of: Pile.

In building; a pile is a deep foundation. These are formed by creating a hole deep enough to locate solid sub-soil. The hole is usually filled with concrete and reinforced or a section of solid steel is installed

Definition of: Pink land.

In property; pink land is land with a 'residential use class'. The term is used largely by local authority planners and originates from the ink colour used to identify residential development areas on maps and plans.

Definition of: Pitch.

In building; the pitch is the angle or slope of a roof or staircase.

Definition of: Planning permission.

In property; planning permission is the authority granted by the local council for land to be developed or additions made to an existing property, usually with certain conditions attached.

Definition of: Plate.

In building; a plate is a length of timber or steel placed either on top of a wall to support the roof trusses (a wall plate) or fixed to a floor so that studs or a timber-framed partition can be installed (a floor plate).

Definition of: P/N

In solar PV manufacturing; P/N is a semiconductor photovoltaic device structure in which the junction is formed between a p-type layer and an n-type layer.

Definition of: Precast concrete.

In building; precast concrete is a term used for concrete components cast in a factory or on site prior to being placed in their final positions.

Definition of: Profile boards.

In building; profile boards are boards of about a meter long used to transfer the plan outline of a building onto the ground. They are held securely in place by timber stakes. Lines are stretched between saw-cuts or marks, so the position of a wall can be fixed.

Definition of: P-Type Semiconductor

In solar PV manufacturing; a p-type semiconductor is a semiconductor in which holes carry the current; produced by doping an intrinsic semiconductor with an electron acceptor impurity (e.g, boron in silicon).

Definition of: Purlin.

In building; a purlin is positioned half-way up the slope of a roof, purlins are timber beams installed to support the rafters.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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