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Wafer |
A thin sheet of crystalline semiconductor material either made by mechanically sawing it from a single-crystal boule or multicrystalline ingot or block, or made directly by casting. The wafer is "raw material" for the solar cell. |
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Watt (W) |
The unit of electrical power commonly used to define the electricity consumption of an appliance. The power developed when a current of one ampere flows through a potential difference of one volt; 1/746 of a horsepower. 1 Watt = 1 Joule. |
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Watt hour (Wh) |
A unit of energy equal to one Watt of power being used for one hour. |
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Watt peak |
The number of Watts output when it is illuminated under standard conditions of 1000 Watts/meter2 intensity, 25. |
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Watt peak (User friendly definition) |
DC Watts output of a solar module as measured under an industry-standardized light test before the solar module leaves the manufacturers facility. |
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Watt/kilowatt/megawatt/gigawatt |
Units of electrical power (that is, the rate at which electrical energy is generated) increasing in scale by a factor of 1000. |
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Waveform |
The shape of a wave or pattern representing a vibration. The shape characterizing an AC current or voltage output. |
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Wet shelf life |
The period over which a charged battery, filled with electrolyte, can remain unused before its performance falls below a specified level. |
