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Duty Cycle
The percentage of time a load is operating
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Critical Design Ratio
The ratio of electrical energy demand to average insolation during a period
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Critical Design Month
The month with the highest critical design ratio
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Load Fraction
The portion of load operating power that comes from the battery bank over the course of a day
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Soiling
The accumulation of dust and dirt on an array surface that shades the array and reduces electrical output
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Installed nominal operating cell temperature (INOCT)
The estimated temperature of a module operating in a specific mounting system design
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Fixed-Tilt Mounting System
An array mounting system that permanently secures modules in a nonmovable position at a specific tilt angle
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Rack Mount
A type of fixed or adjustable - tilt array mounting system with a triangular-shaped structure to increase the tilt angle of the array
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Standoff Mount
A type of fixed-tilt arrary mounting system where modules are supported by a structure parallel to and slightly above the roof surface
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Galvanic Corrosion
An electrochemical process that causes electrical current to flow between two dissimilar metals, which eventually corrodes one of the materials (the anode).
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Sacrificial Anode
A metal part, usually zinc or magnesium, that is more susceptible to galvanic corrosion that the metal structure it is attached to, so that it corrodes, rather than the structure
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Design Load
Is a calculated structural load used to evaluate the strength of a structure to failure
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Dead Load
Is a static structural load due to the weight of permanent building members, supported structure, and attachments
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Live Load
A dynamic structural load due to the weight of temporary items and people using or occupying the structure
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Basic Wind Speed
The maximum value of a 3 sec gust at 33' (10m) elevation, which is used in wind load calculations
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Resonance
The condition when a vibration frequency matches the fundamental frequency of the structure
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Allowable Withdrawal Load
The force required to remove a screw from a material by tensile (pulling) force only
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Blocking
The addition of lumber under a roof surface and between trusses or rafters as supplemental structural support
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Spanning
The addition of lumber under a roof surface and across trusses or rafters as supplemental structural support
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Self-Ballasting
An attachment method that relies on the weight of the array, support structure, and ballasting material to hold the array in position
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Active Tracking Mount
An array mounting system that uses electric motors and gear drives to automatically direct the array toward the sun
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Passive Tracking Mount
An array mounting system that uses noelectrical means to automatically direct an array toward the sun
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