Ch 9/10 PV

The percentage of time a load is operating

The ratio of electrical energy demand to average insolation during a period

The month with the highest critical design ratio

The portion of load operating power that comes from the battery bank over the course of a day

The accumulation of dust and dirt on an array surface that shades the array and reduces electrical output

The estimated temperature of a module operating in a specific mounting system design

An array mounting system that permanently secures modules in a nonmovable position at a specific tilt angle

A type of fixed or adjustable - tilt array mounting system with a triangular-shaped structure to increase the tilt angle of the array

A type of fixed-tilt arrary mounting system where modules are supported by a structure parallel to and slightly above the roof surface

An electrochemical process that causes electrical current to flow between two dissimilar metals, which eventually corrodes one of the materials (the 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

Is a calculated structural load used to evaluate the strength of a structure to failure

Is a static structural load due to the weight of permanent building members, supported structure, and attachments

A dynamic structural load due to the weight of temporary items and people using or occupying the structure

The maximum value of a 3 sec gust at 33' (10m) elevation, which is used in wind load calculations

The condition when a vibration frequency matches the fundamental frequency of the structure

The force required to remove a screw from a material by tensile (pulling) force only

The addition of lumber under a roof surface and between trusses or rafters as supplemental structural support

The addition of lumber under a roof surface and across trusses or rafters as supplemental structural support

An attachment method that relies on the weight of the array, support structure, and ballasting material to hold the array in position

An array mounting system that uses electric motors and gear drives to automatically direct the array toward the sun

An array mounting system that uses noelectrical means to automatically direct an array toward the sun