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

FBR Fluidized bed reactor.
Fill factor On an I-V (current-voltage) curve characterizing the output of a solar cell or module, the ratio of the maximum power to the product of the open-circuit voltage and the short-circuit current. The higher the fill factor (FF) the more square the shape of the I-V curve.
Fixed tilt array A solar PV array set at a fixed angle to the horizontal.
Flat-plate PV A solar PV array or module that does not contain concentrating devices and so responds to both direct and diffuse sunlight.
Float charge A battery charge current that is equal to, or slightly greater than, the self-discharge rate.
Float life The time a battery can maintain its stated capacity when kept at float charge. Usually measured in years.
Flooded cell battery A form of rechargeable battery in which the plates are completely immersed in a liquid electrolyte. Most cars use flooded cell batteries. Flooded cell batteries are the most commonly used type for independent and remote area power supplies.
Fluorescent light A form of lighting that uses long thin tubes of glass which contain mercury vapor and various phosphor powders (chemicals based on phosphorus) to produce white light. Generally considered to be the most efficient form of home lighting.
Frequency The number of cycles or repetitions per unit time of a complete waveform. Usually expressed in cycles per second or Hertz (Hz) in electrical applications. Electrical equipment in the United States requires 60 Hz, in Europe 50Hz.
Fresnel lens A concentrating lens, positioned above and concave to a PV material to concentrate light on the material.
Fuel cell An electrochemical device that converts the energy of a fuel directly into electricity and heat and is therefore very energy efficient.
Fuse A device used to protect electrical equipment from short circuits. Fuses are made with metals that are designed to melt when the current passing through them is high enough. When the fuse melts, the electrical connection is broken, interrupting power to the circuit or device.
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