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photovoltaics > Scotts Deck > Flashcards

Scotts Deck Flashcards

0
Q

Name 6 nab cep tests

A
  1. PV entry level exam
  2. Installer certification
  3. PV technical sales certification
  4. Solar thermal entry level
  5. Solar thermal certification
  6. Small wind certification
  7. Renewable energy storage systems
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1
Q

What does nab cep stand for

A

North American board of certified energy practitioners

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2
Q

in 1839 what did PV pioneer Edmond Bacquerel discover?

A

1839 Electrode emissions in solution increased emissions when exposed to light

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3
Q

In 1954 what did bell labs develop.

A

The first silicon based solar cell

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4
Q

What type of pv system feeds power to the grid but can’t power your house if the grid goes down?

A

A grid tied utility interactive Pv system

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5
Q

What type of system feeds power to the grid but can keep giving you power if the grid goes down.

A

Grid tied with battery backup

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6
Q

What are two differences that differentiate commercial from residential pv

A

Residential single phase 240v ac under 10k

Commercial 208 277 480 usually over 10 k

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7
Q

Advantages of PV over other renewable energy systems

A

Pv works when energy demand is highest

Wind not reliable people live sunny rather than windy places

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8
Q

Would it be more economical to implement energy efficiency improvements or install PV in a house with poor insulation and inefficient appliances and lighting.

A

Energy efficiency would be a better choice. because it is easier and more cost effective to insulate or use more efficient lights and appliances than it is to make enough solar power to compensate for using inefficient buildings or appliances. It’s cheaper to save than buy.

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9
Q

What does OSHA stand for and what is required for NABCEP certification.

A

Occupational safety and health administration

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10
Q

Equation for power

A

Power in watts = v volts x current I in amps

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11
Q

Energy =

A

Energy equals watt hour

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12
Q

Relationship between voltag resistance and current

A

V= I x R

Vis volts I is current r is resistance in oms

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13
Q

What is kilo mega giga and milli mean

A

Kilo thousand mega million giga billion

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14
Q

What is Isc

A

Isc is short circuit voltage. all current no voltage wires shorted

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15
Q

What is Voc

A

Voc is open circuit voltage, no current wires not touching

It is all voltage no current

16
Q

What is Imp and Vmp

A

Imp and Vmp are current and voltage at the point of maximum power output

17
Q

What does STC have to do with how do you find the maximum

Rated power of your panel and why isn’t it realistic?

A

You find panel rating in watts by multiplying current times voltage both at maximum power output or Imp x Vmp

18
Q

What are the STC ‘s

A

STC stands for standard test conditions and is 1000 watts per sq meter at 25 degrees Celsius and 1.5 atmospheres pressure

19
Q

What is Irradiance?

A

Irradiance represents an instantaneous measure of power on an area

20
Q

What is MPPT and what does it accomplish

A

Solar edge uses MPPT or maximum power point tracking in power optimisers to keep the output power V x I always at the point where maximum power can be made by the panel

21
Q

How does Linking panels in a longer series string affect the output current and voltage?

A

Linking panels in series increases the voltage by the number of panels times the output voltage of each panel

22
Q

On the I V curve graph of a panels measured voltage vs. current. what is significant about the point on the graph whare Vmp and Imp are found

A

It is the voltage and current at which your panel will make the most power.

23
Q

What is solar insulation

A

Solar insulation is a measure of solar irradiation usually over a year

24
Q

What is solar irradiation

A

Irradiation is irradiance times time

25
Q

Is irradiance a measure of power or energy

A

Irradiance commonly measured in watts per meter squared is a measure of power

26
Q

What is a peak sun hour

A

A peak sun hour is a measure of the solar irradiation 1000 watts per square meter for one hour at noon

27
Q

How do you measure azimuth and what direction would you be looking if your reading was 180

A

You use a compass to measure azimuth and a reading of 180 means you are facing south

28
Q

What is magnetic declination, and with a declination of 14 degrees in California what would your compass have to read to face true south

A

Magnetic declination is the deviation of magnetic north from true north caused by the fact that geographic north does not line up with magnetic north. You would have to turn until your compass read 190 degrees

29
Q

If you were tilting a south facing panel up to get the most sun at noon would you use your latitude or longitude for your tilt angle

A

You’re latitude as this would make the panel perpendicular to the suns rays

30
Q

Why is it not usually worth using single or duel tracking on our solar arrays

A

The cost of the tracker does not improve the performance of the system enough to justify the cost. You would be better off spending the money on more panels

31
Q

Why would a duel axis tracker give a greater increase in proformance on the moon than on earth

A

At low angles of sun on the moon the atmosphere would not diminish the amount of solar irradiance hitting the panel

32
Q

What is the function of the solar pathfinder or solmetric suneye

A

They both help determine the annual amount of solar resource available to you in a specific location

33
Q

Compare and contrast direct beam and diffuse solar radiation.

A

Direct beam radiation is direct uninterrupted solar radiation, while diffuse radiation is indirect radiation not coming from a single direction and source( clouds, blue sky, haze)

34
Q

What type of solar radiation is albedo.

A

Reflected radiation

35
Q

What does a pyranometer measure.

A

Total solar irradiation both diffuse and direct beam

36
Q

Use your understanding of the different types of solar radiation to explain why a 1 megawatt CSS , or concentrating solar collector array would be more likely to use a tracking system than a 1 megawatt PV solar array

A

A concentrating solar collector needs direct beam radiation to function and therefore it’s collecting mirrors must always have a way to remain pointed at the sun, a PV panel system can gather both diffuse and direct beam radiation without being precisely oriented toward the sun and thus hav less need of tracking

photovoltaics (4 decks)

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