Solar Power

Front 1

A photovoltaic cell or device converts sunlight to

Back 1

DC electrical energy

Front 2

PV systems operating in parallel with the electric utility system are commonly referred to as _______
systems

Back 2

interactive

Front 3

While PV cells produce only ____ power, PV system can produce ____ power.

Back 3

AC and DC

Front 4

solar power is commonly expressed in units of

Back 4

wats per square meter wh m2

Front 5

solar energy is commonly expressed in units of

Back 5

watt hours per square meter wh m2
kilowatts hours per square meter kw m2

Front 6

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

Back 6

4

Front 7

solar power is used to estimate the

Back 7

instantaneous output of pv modules and arrays

Front 8

peak sun hour data is used for estimating the

Back 8

energy output of PV modules and arrays over time

Front 9

if the solar irradiance on a surface averages 700 w m2 for seven hours, what is the total acumulated solar irradiation

Back 9

4.9 kwh m2

Front 10

if the solar irradiation on a surface totals 4 kwh m2 over 8 hours, what is the average irradiance over this period

Back 10

500 w m2

Front 11

if the total annual solar energy on a given surface is 2000 kwh m2, what is the average daily solar energy received

Back 11

5.5 kwh m2

Front 12

air mass is a representation of the

Back 12

relative distance of atmosphere that radiation must travel through to reach the earths surface

Front 13

the solar zenith angle is the angle between the

Back 13

sun and point in the sky directly over head

Front 14

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

Back 14

1000 w m2

Front 15

what value of solar irradiance is most commonly used to rate the output of pv modules and arrays

Back 15

1000 w m2

Front 16

the orientation of PV arrays is defined by their ____ and ____ angles

Back 16

azimuth tilt

Front 17

for any location, which of the following surfaces receives the greatest amount of annual solar radiation

Back 17

dual axis tracking

Front 18

list three purposes for conducting a site survey in advance of PV installations

Back 18

establish customer needs
determine size of array
determine extend of shading
determine location of array

Front 19

when evaluating potential PV array locations, the most important consideration is

Back 19

shading

Front 20

list six items or types of equipment used for PV system site survey

Back 20

hand
marking
ladder
sun meter
notebook
graph paper

Front 21

what type of PV system is intended to operate in parallel with the electric utility system

Back 21

interactive

Front 22

which of the following components are considered power conditioning equipment

Back 22

all of the above

Front 23

inverters are used in PV systems to convert ____ power to ____ power

Back 23

dc ac

Front 24

the electrical contacts on the top surface of a silicon solar cell are typically what polarity

Back 24

negative

Front 25

associate the following parameters with their location on the i v curve shown

Back 25

c maximum power voltage
b maximum power current
e maximum power
a short circuit current
d open circuit voltage

Front 26

a given i v curve represents the electrical output of a PV device for which of the following

Back 26

irradiance level
temperature

Front 27

what factors determine the operating point on any given i v curve

Back 27

electrical load

Front 28

what is the smallest field installable unit in a photovoltaic system

Back 28

PV module

Front 29

the nec defines a pv array as

Back 29

690. 2

Front 30

typically PV modules are connected in __ to achieve a desired voltage output, then connected in ___ to build power output.

Back 30

series parallel