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Solar Energy System Design & Installation Flashcards

7 cards from real NABCEP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Solar Energy System Design & Installation flashcards as text

  1. What is the primary purpose of a combiner box in a large PV array?

    Answer: To combine multiple string outputs into a single feed to the inverter

    A combiner box aggregates the outputs of multiple PV strings into a single DC feed, simplifying wiring runs to the inverter.

  2. Which NEC article primarily governs the installation of solar photovoltaic systems?

    Answer: Article 690

    NEC Article 690 covers solar photovoltaic systems, including wiring methods, overcurrent protection, and disconnecting means.

  3. A PV system produces 8 kWp DC. If the inverter has a CEC efficiency of 96%, what is the approximate AC output at peak?

    Answer: 7.68 kW

    Multiplying 8 kWp by 0.96 efficiency yields 7.68 kW AC output at peak conditions.

  4. What is the minimum required ground clearance for conductors on a residential rooftop PV system under NEC requirements?

    Answer: The NEC does not specify rooftop conductor ground clearance

    The NEC addresses clearances for service drops and overhead conductors, but does not specify a minimum ground clearance for conductors already on a rooftop.

  5. Which factor most directly reduces the output of crystalline silicon PV modules on a hot summer day compared to STC ratings?

    Answer: Elevated cell temperature reducing Voc and Pmax

    Crystalline silicon has a negative temperature coefficient for power; as cell temperature rises above 25°C, both Voc and Pmax decrease.

  6. In a grid-tied PV system, what is the function of anti-islanding protection?

    Answer: Preventing the inverter from back-feeding power during a utility outage

    Anti-islanding protection causes the inverter to shut down when utility power is lost, preventing hazardous energization of a de-energized grid.

  7. When sizing DC conductors for a PV source circuit, NEC 690.8 requires the conductor ampacity to be at least what percentage of the module's rated Isc?

    Answer: 156%

    NEC 690.8 requires DC source-circuit conductors to be rated at 156% of the module's Isc (125% × 125% for continuous current under sunlight).