Solar Flashcards

1
Q

Simplest type of system to size

A

Utility interactive

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2
Q

Limitations to size an interactive system? Voltage per nec

A

Space and budget

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3
Q

Fine balance when sizing a stand alone system

A

Supply and demand

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4
Q

Loads to consider in sizing a bi-modal system

A

Critical loads

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5
Q

Solar to generator tarot for a hybrid system?

A

90%: 10% to 40%:60%

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6
Q

Load an inverter should be rated for?

A

Largest AC load

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7
Q

Critical design ratio

A

Load demand vs. instillation ( for each month)

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8
Q

System availability

A

% of time a system meets load- requirements

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9
Q

In battery bank sizing it demands required capacity

A

Autonomy

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10
Q

Accessibility

A

Safe/ practical access to equipment

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11
Q

Cooler arrays

A

More reliable,last longer and more efficient

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12
Q

Preferred mounting types

A

Rack and stand off

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13
Q

Tracking system that receives the most solar irradiance

A

2-axis

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14
Q

Galvanic corrosion

A

2 metals reacting degrading the lesser metal.

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15
Q

Dead load

A

Permanent structural load -5to 10 psf

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16
Q

Live load

A

Temporary structural load – 5 to 10 PSF

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17
Q

Wind load

A

Structural load that comes from all directions – 25 to 50 PSF

18
Q

Snow load

A

Structural load found at the AHJ

19
Q

Vibration load

A

Structural load caused by equipment, roads, airports, trains, etc.

20
Q

Self ballasting advantage

A

No roofing penetration

21
Q

Maximum output-ciruit voltage for 1 and 2 family homes

22
Q

Correction factor for maximum pv output voltage per nec

A

Temperature correction factor.

23
Q

Correction factor for maximum pv circuit current

A

125% or 1.25

24
Q

2 places to fined temperature correction factors array open circuit voltage

A

Module manufacturers specifications or nec 690.7

25
Max inverter current can exceed nominal ratings under this condition
Match the highest current with the lowest voltage
26
Wire (conductor) size system
AWG
27
Ampacity
Current a wire can carry without exceeding its temperature rating
28
Derate
The action of reducing a wires rated ability | ampacify
29
What temperature does to a wires ampacity
Reduces a wires rated ability based on temperature
30
What is system availability when sizing a system?
% of time over a year the system meet load requirements
31
When selecting a battery bank what determines its required capacity
The autonomy period during the critical mounth
32
What is the fine balance required when sizing a stand alone system
Supply VS. demand
33
In critical design the ratio of energy demand to insulation is found how often
Each month
34
In a hybrid system design what is the typical range of solar energy generator ratios
90% pv 10% generator
35
When selecting an inverter what load should the inverter be rated for.
Slightly larger than the largest AC load
36
What is the main limitations one sizing and interactive system
Space for the array and the customers budget
37
In system sizing what is the simplest type of PV system to size
Utility interactive
38
When sizing a modal System which load should you consider
Critical loads
39
The percentage of the time the load is operating is called
Duty cycle
40
When PV modules are substituted for regular building materials this mounting is called
Building integrated