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30 Cards in this Set
- Front
- Back
A photovoltaic cell or device converts sunlight to
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DC electrical energy
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PV systems operating in parallel with the electric utility system are commonly referred to as _______
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interactive
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While PV cells produce only ____ power, PV system can produce ____ power.
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AC and DC
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solar power is commonly expressed in units of
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wats per square meter wh m2
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solar energy is commonly expressed in units of
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watt hours per square meter wh m2
kilowatts hours per square meter kw m2 |
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if the solar energy received on a surface is 4 kwh m2 and there are 12 hours of daylight, how many peak sun hours are available
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4
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solar power is used to estimate the
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instantaneous output of pv modules and arrays
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peak sun hour data is used for estimating the
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energy output of PV modules and arrays over time
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if the solar irradiance on a surface averages 700 w m2 for seven hours, what is the total acumulated solar irradiation
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4.9 kwh m2
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if the solar irradiation on a surface totals 4 kwh m2 over 8 hours, what is the average irradiance over this period
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500 w m2
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if the total annual solar energy on a given surface is 2000 kwh m2, what is the average daily solar energy received
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5.5 kwh m2
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air mass is a representation of the
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relative distance of atmosphere that radiation must travel through to reach the earths surface
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the solar zenith angle is the angle between the
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sun and point in the sky directly over head
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the peak solar irradiance on a surface facing the sun at solar noon at most sea level locations on a clear day, also referred to as "peak sun", is assumed to be
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1000 w m2
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what value of solar irradiance is most commonly used to rate the output of pv modules and arrays
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1000 w m2
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the orientation of PV arrays is defined by their ____ and ____ angles
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azimuth tilt
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for any location, which of the following surfaces receives the greatest amount of annual solar radiation
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dual axis tracking
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list three purposes for conducting a site survey in advance of PV installations
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establish customer needs
determine size of array determine extend of shading determine location of array |
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when evaluating potential PV array locations, the most important consideration is
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shading
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list six items or types of equipment used for PV system site survey
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hand
marking ladder sun meter notebook graph paper |
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what type of PV system is intended to operate in parallel with the electric utility system
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interactive
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which of the following components are considered power conditioning equipment
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all of the above
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inverters are used in PV systems to convert ____ power to ____ power
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dc ac
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the electrical contacts on the top surface of a silicon solar cell are typically what polarity
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negative
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associate the following parameters with their location on the i v curve shown
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c maximum power voltage
b maximum power current e maximum power a short circuit current d open circuit voltage |
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a given i v curve represents the electrical output of a PV device for which of the following
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irradiance level
temperature |
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what factors determine the operating point on any given i v curve
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electrical load
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what is the smallest field installable unit in a photovoltaic system
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PV module
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the nec defines a pv array as
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690. 2
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typically PV modules are connected in __ to achieve a desired voltage output, then connected in ___ to build power output.
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series parallel
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