NABCEP PV Design Specialist

A residential customer wants to offset 100% of their annual electricity consumption. Which of the following is the MOST important first step in the design process?

• AChoosing the module tilt angle for maximum summer production
• BReviewing at least 12 months of utility billing data to determine annual energy consumpti…
• CCalculating the required number of batteries for backup
• DSelecting the inverter brand and model

A customer in a time-of-use (TOU) rate structure wants to maximize bill savings. How should the PV system orientation be adjusted compared to a standard south-facing design?

• AInstall a flat-mounted array for uniform daily production
• BIncrease the tilt angle to maximize winter production
• COrient the array due east to capture morning sun
• DOrient the array toward the southwest to shift peak production later in the day

When discussing system expectations with a customer, which metric BEST represents the actual energy a PV system will produce relative to its rated capacity?

• ADC-to-AC deration factor
• BTemperature coefficient
• CSpecific yield (kWh/kWp)
• DCapacity factor

A customer has a net metering agreement with their utility that credits excess generation at the retail rate. What is the optimal system sizing strategy?

• ASize the system to closely match 100% of annual consumption since excess credits have dim…
• BSize the system to cover only daytime loads since net metering does not apply at night
• CSize the system to produce 150% of annual consumption for maximum credit accumulation
• DAlways install the largest system the roof can accommodate regardless of consumption

Which customer concern is BEST addressed by including a battery energy storage system (BESS) in a PV system design?

• AProviding backup power during grid outages
• BIncreasing the efficiency of the PV modules
• CEliminating the need for a utility interconnection agreement
• DReducing the total installed cost of the PV system

A customer asks about the expected degradation of their PV system over 25 years. What is the typical annual degradation rate for crystalline silicon modules?

• A0.5% per year
• B5.0% per year
• C2.0% per year
• D0.1% per year

When presenting a PV system proposal to a customer, which document provides the most comprehensive technical basis for expected system performance?

• AA generic regional solar resource map
• BA site-specific production estimate from validated modeling software such as PVsyst or He…
• CThe module manufacturer datasheet alone
• DThe inverter specification sheet

A commercial customer wants to reduce demand charges. Which PV system design feature is MOST effective for demand charge reduction?

• APairing PV with battery storage programmed for peak demand shaving
• BIncreasing the tilt angle to maximize winter production
• CInstalling a larger array with higher DC-to-AC ratio
• DUsing microinverters instead of string inverters

What is the primary reason a customer's actual PV system production may differ from the production estimate provided during the sales process?

• AThe customer used too much electricity
• BThe inverter manufacturer changed the efficiency rating after installation
• CActual weather conditions differ from the long-term average data used in the model
• DThe utility changed the direction of current flow

A customer inquires about the warranty coverage for their PV modules. What are the TWO standard warranty types provided by module manufacturers?

• AInverter warranty and racking warranty
• BLabor warranty and material warranty
• CInstallation warranty and shipping warranty
• DProduct (workmanship) warranty and performance (power output) warranty

When designing a PV system for a customer with plans to add an electric vehicle in the future, what is the BEST design approach?

• AAlways double the system size to prepare for any future load
• BAccount for the anticipated additional EV charging load in the system sizing while verify…
• CIgnore future loads since they cannot be accurately predicted
• DDesign only for current loads and let the customer add a separate system later

A customer is comparing two proposals: one using premium high-efficiency modules and one using standard-efficiency modules. When would premium modules be the BETTER choice?

• AWhen the customer plans to remove the system within 5 years
• BWhen the system is ground-mounted with no space constraints
• CWhen available roof area is limited and the customer needs to maximize power density (W/f…
• DWhen the customer has unlimited roof space and budget is the primary concern

When reviewing project criteria for a PV installation, which document provides the legal description of the property and any easements that may affect array placement?

• AThe module manufacturer's installation manual
• BThe property survey or plat map
• CThe customer's utility bill
• DThe building permit application

What is the significance of the ASHRAE 99.6% design temperature in PV system design?

• AIt represents the average annual temperature used for energy production estimates
• BIt represents the temperature at which PV modules reach their rated power
• CIt represents the coldest expected temperature and is used for maximum voltage calculatio…
• DIt represents the hottest temperature expected and is used for conductor ampacity derating

When reviewing project criteria, what is the primary purpose of determining the available utility service amperage?

• ATo calculate the expected PV system production in kWh
• BTo determine whether the existing electrical service can accommodate the PV system interc…
• CTo establish the required battery capacity
• DTo select the appropriate module wattage

Per NEC 705.12(B)(2), what is the maximum PV system size that can be connected to a 200A residential panel using a load-side connection with a 200A main breaker?

• A100A (20 kW inverter)
• B20A (4 kW inverter)
• C50A (10 kW inverter)
• D40A (7.6 kW inverter)

Which building characteristic is MOST critical to evaluate when determining whether a roof can support a PV array?

• AThe age and condition of the roof structure, including remaining useful life
• BWhether the attic is finished or unfinished
• CThe brand of shingles installed
• DThe color of the roofing material

What is the purpose of reviewing the local utility's interconnection requirements during the project criteria review phase?

• ATo identify system size limits, technical requirements, metering arrangements, and applic…
• BTo calculate the expected payback period
• CTo determine the color of the disconnect switch enclosure
• DTo select the brand of PV modules to be used

A commercial building has a flat roof with a white TPO membrane. What design consideration is MOST relevant for this roof type?

• AThe modules must be flush-mounted to the roof surface
• BOnly thin-film modules can be used on flat roofs
• CBallasted racking systems may be used to avoid membrane penetrations, subject to structur…
• DPV modules cannot be installed on TPO roofs

When reviewing project criteria, what is the significance of the local jurisdiction's fire code setback requirements for rooftop PV?

• AThey only apply to commercial buildings over 3 stories
• BThey require clear pathways on the roof for firefighter access and ventilation, reducing…
• CThey determine the minimum module efficiency required
• DThey only apply to ground-mounted systems

What information is typically found on a PV module's nameplate label that is essential for electrical design?

• AThe module's weight, dimensions, and shipping date
• BOnly the manufacturer name and model number
• CThe recommended inverter model and wire gauge
• DRated power (Pmax), open-circuit voltage (Voc), short-circuit current (Isc), voltage at m…

What is the purpose of reviewing the Authority Having Jurisdiction (AHJ) requirements during the project criteria phase?

• ATo determine which brand of modules to use
• BTo select the utility rate structure
• CTo calculate the expected energy production
• DTo identify local building codes, permit requirements, plan submission formats, and inspe…

Which factor has the GREATEST impact on the annual energy production of a fixed-tilt PV array?

• AThe color of the module frame
• BThe length of the DC home run conductors
• CThe array azimuth (compass orientation) and tilt angle relative to the local latitude
• DThe brand of the mounting hardware

When reviewing project criteria for a ground-mounted PV system, what geotechnical information is essential for foundation design?

• AThe type of grass growing on the property
• BThe distance to the nearest paved road
• CThe color of the topsoil
• DSoil type, bearing capacity, frost depth, and water table level

What is the primary purpose of conducting a shade analysis during the site assessment phase?

• ATo measure the roof pitch angle
• BTo determine the color of the PV modules
• CTo identify and quantify shading obstructions that will reduce system energy production t…
• DTo determine the required wire gauge for DC conductors

A site assessment reveals that a large deciduous tree shades the south-facing roof from 9 AM to 12 PM during winter months. What is the BEST design approach?

• AUse module-level power electronics (MLPEs) such as microinverters or DC optimizers to mit…
• BWait for the tree to die before installing the system
• CCancel the project since shading makes solar impractical
• DInstall the array on the north-facing roof instead

What tool or resource provides the solar irradiance data (insolation values) for a specific project location in the United States?

• AThe roofing manufacturer's installation guide
• BThe utility company's rate schedule
• CNREL's National Solar Radiation Database (NSRDB) or PVWatts calculator
• DThe local building code book

During a site assessment, you measure the roof pitch to be 6:12. What is the approximate tilt angle in degrees?

• A27 degrees
• B45 degrees
• C18 degrees
• D33 degrees

What is magnetic declination, and why is it important during a site assessment?

• AIt is the deviation in module voltage caused by magnetic fields
• BIt is the difference between true north and magnetic north, which must be accounted for w…
• CIt is the angle between the roof ridge and the property line
• DIt is the angle of the sun at solar noon

What is the solar window, and what is the minimum acceptable annual solar access percentage for a typical PV installation?

• AThe time between sunrise and sunset; minimum 50%
• BThe sun's path across the sky throughout the year as viewed from the array location; mini…
• CThe window of time when the utility allows grid export; minimum 100%
• DThe window opening in the attic for wiring access; no minimum required

During a site assessment for a ground-mounted system, what is the purpose of checking the flood zone designation (FEMA flood maps)?

• ATo select the appropriate module type
• BTo determine the available solar resource
• CTo calculate the required conductor size
• DTo ensure the system is designed above the base flood elevation and to identify any permi…

What does the term 'Peak Sun Hours' (PSH) represent in solar energy design?

• AThe total number of daylight hours at a location
• BThe number of hours the PV system produces at its rated power
• CThe hours between 10 AM and 2 PM when the sun is strongest
• DThe equivalent number of hours at 1,000 W/m2 irradiance that would deliver the same total…

When conducting a site assessment, you notice the existing electrical panel is a Federal Pacific Stab-Lok panel. What is the design implication?

• AThis panel is ideal for PV interconnection due to its high capacity
• BThis panel type has known safety issues with breaker tripping failures and should be repl…
• CThis panel automatically qualifies for a supply-side connection
• DNo special consideration is needed for this panel type

What is the purpose of documenting the existing roof penetrations (vents, skylights, chimneys) during a site assessment?

• ATo identify obstructions that limit array placement, create shading, and require setback…
• BTo determine the module temperature coefficient
• CTo determine the electrical service size
• DTo calculate the solar irradiance at the location

During a site assessment, you determine the roof has a standing-seam metal surface. What is the primary advantage of this roof type for PV installation?

• AClamp-based attachment systems can be used without penetrating the roof surface
• BIt eliminates the need for grounding the array
• CIt provides higher solar reflectance than other roof types
• DIt allows modules to be adhered directly to the metal surface

What is the typical dead load (weight) per square foot that a flush-mounted residential PV system adds to a roof?

• A2.5 to 5 psf
• B10 to 15 psf
• C20 to 25 psf
• DLess than 1 psf

Which factor determines the inter-row spacing for a tilted array on a flat roof or ground mount?

• AThe desired limit of row-to-row shading based on the sun's altitude angle at the winter s…
• BThe module manufacturer's warranty requirements
• CThe length of the DC wiring runs
• DThe color of the roofing material

What is the Global Horizontal Irradiance (GHI) and why is it used in PV system design?

• AThe irradiance measured only from direct sunlight on a horizontal surface
• BThe irradiance reflected from the ground surface
• CThe total solar irradiance received on a horizontal surface from both direct beam and dif…
• DThe irradiance measured at the module surface after accounting for all system losses

During a site assessment, what measurement is needed to verify the existing grounding electrode system for the PV installation?

• AThe type, size, and condition of the existing grounding electrode (ground rod, Ufer groun…
• BThe voltage of the utility transformer
• CThe distance from the panel to the nearest window
• DThe amperage of each branch circuit breaker

What is the primary purpose of a racking system's attachment to the roof structure?

• ATo act as the equipment grounding conductor
• BTo transfer the dead load, live load, wind uplift, and seismic forces from the array to t…
• CTo provide a pathway for electrical conductors
• DTo provide an aesthetic appearance

According to ASCE 7, which reference wind speed map is used to determine the design wind loads for a rooftop PV system?

• AThe Beaufort scale wind classification map
• BThe ultimate design wind speed (Vult) map for the risk category of the building
• CThe average annual wind speed map
• DThe maximum recorded wind gust in the county

What is the purpose of module clamps in a PV racking system, and what are the two common types?

• AThey attach the inverter to the wall; types are flush and standoff
• BThey secure modules to the racking rails; types are mid-clamps (between modules) and end-…
• CThey connect the DC wiring; types are MC4 and H4
• DThey connect the racking to the roof; types are lag bolts and through-bolts

When designing a ballasted flat-roof PV system, what is the primary engineering concern that determines the amount of ballast required?

• AThe color of the ballast blocks
• BWind uplift forces that could lift or slide the array, which must be countered by suffici…
• CThe temperature rating of the modules
• DThe aesthetic appearance of the array

What is the difference between landscape and portrait module orientation, and when might portrait orientation be preferred?

• APortrait orientation is prohibited by NEC 690
• BThere is no difference; orientation does not affect system design
• CLandscape only applies to thin-film modules
• DLandscape means the long edge is horizontal; portrait means the long edge is vertical. Po…

What is the purpose of a flashing (e.g., Quickmount PV or similar) used with a composition shingle roof attachment?

• ATo create a waterproof seal around the lag bolt penetration through the roof deck, preven…
• BTo provide an electrical ground connection between the racking and the roof
• CTo provide thermal insulation between the module and the roof
• DTo increase the wind resistance of the array

How does snow load affect the mechanical design of a rooftop PV system?

• ASnow only affects ground-mounted systems
• BSnow has no effect on PV system design
• CSnow load only applies to flat roofs
• DThe racking system and roof structure must be designed to support the additional weight o…

What structural member should roof-mounted PV racking attachments ideally penetrate into?

• AThe gutter system
• BThe roof rafters or trusses (structural framing members)
• CThe fascia board
• DThe roof sheathing only