*'''Extrusion time''' is defined as the average time required to produce a meter of filament as timed with a digital watch.
*'''Solar cell efficiency''' is the ratio of the electrical output of a solar cell to the incident energy in the form of sunlight. The energy conversion efficiency of a solar cell is the percentage of the solar energy to which the cell is exposed that is converted into electrical energy.
*'''grid-connected PV system''' is an electricity generating solar PV system that is connected to the utility grid. A grid-connected PV system consists of solar panels, one or several inverters, a power conditioning unit and grid connection equipment. They range from small residential and commercial rooftop systems to large utility-scale solar power stations.
*'''Energy payback time''' is the time it takes for a photovoltaic(PV) system to generate an amount of energy equal to that used in its production.
*'''Levelized cost of electricity''' (LCOE) represents the per-kilowatt hour cost (in real dollars) of building and operating a power plant over an assumed financial life and duty cycle.
*'''Grid parity''' refers to the lifetime generation cost of the electricity from PV being comparable with the electricity prices for conventional sources on the grid.