NABCEP PV ASSOCIATE EXAM AND RETAKE EXAM

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NABCEP PV ASSOCIATE EXAM AND RETAKE EXAM

NEWEST A CTUAL EXAM 270 QUESTIONS AND

CORRECT DETAILED ANSWERS ( VERIFIED

ANSWERS) |ALREADY GRADED A+

NABCEP PV ASSOCIATE EXAM

A 12V light is left on for 13 hours at 1.5A with a 12V battery. How much energy is used? - ANSWER- 0.234 kWh 12V * 1.5A * 13hr = 234 Wh

A 12V light is left on for 13 hours at 1.5A with a 12V battery, how many Ah are used? - ANSWER- 19.5 Ah 1.5A * 13hrs

Electrical safety is best studied where? - ANSWER- OSHA website

The interconnection of a PV system is approved by? - ANSWER- The utility

Grounding (bonding) of functionally grounded PV system on a roof should be done to - ANSWER- Racking and frames should be grounded on every PV system. Even ungrounded systems need equipment grounding

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Lowest grid voltage:

• Transmission
• Distribution
• Service equipment
• Generation - ANSWER- Service has the lowest voltage. Service

voltage is the voltage at the building where the electricity is served

If a 12 PV module has 36 cells, then how many volts in a 54 cell module? - ANSWER- 18 Volts 12V/36 cells to find V/cell V/cell * 54 cells = 18V

Transformers convert - ANSWER- High voltage Low current to low Voltage high Current

Undersized PV array:

• Decreases voltage drop
• Decreases battery life
• Increases current drop
• Increases resistance - ANSWER- Decreased array size decreases

battery life (due to not charging battery fully) Not fully charging the battery is not good for the battery

Bypass diodes:

• Reduce current 2 / 4

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• Limit effects of shading
• Are wired in series with groups of solar cells and prevent reverse

current

• Are in the combiner box - ANSWER- Bypass diodes reduce effects

of shading and are wired in parallel in cells in the junction box on the back of the PV module

Microinverters (and inverters) are connected between the ____ and the _____ - ANSWER- between the PV and the service panel

A system that sits on a flat/low slope rooftop and has no penetrations is

called a:

• Flush mounted system
• Flashed system
• BIPV system
• Ballasted system - ANSWER- Ballasted systems are common flat

low slope roof systems that are not penetrating the roof. A ballast is something that is relatively heavy keeps the PV from blowing away

Proper slope for an extension ladder? - ANSWER- 1:4

The primary source for a utility interactive PV system is the:

• Inverter
• Utility

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• Charge controller - ANSWER- Utility. The interactive inverter will

match the voltage and frequency of the utility

What is specified on a charge controller?

• Irradiance limit
• Insolation limit
• Maximum voltage
• Minimum current - ANSWER- A charge controller will have

maximum voltage specified (and so will most any equipment). A charge controller will also specify maximum current

Units for irradiance - ANSWER- Irradiance is power per area, usually measured in watts per square meter. 1000W/m^2 is the irradiance level called Peak sun, or irradiance at STC. Energy per area is irradiation or insolation.

What is used to calculate maximum system voltage? - ANSWER- Temperature is used to calculate maximum system voltage along with Voc, the temperature coeffient of Voc and the number of PV modules connected in series.

What will be increased by reflective surfaces (albedo)? - ANSWER- Current. Reflections and increased light increases current.

What is the best voltage for charging a 12V lead-acid battery?

• 12V
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