Practice Test Geeks(NABCEP) North American Board of Certified Energy Practitioners Solar Practice Test
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Solar PV System Design 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 PV System Design flashcards as text

  1. What is the minimum required clearance between the bottom of a roof-mounted PV array and the roof surface per most manufacturer and fire code requirements?

    Answer: 3 inches

    Most fire codes and manufacturers require at least 3 inches of clearance beneath roof-mounted modules to allow airflow and firefighter access.

  2. When sizing a grid-tied inverter for a PV array, what ratio of array STC DC power to inverter AC rated output is commonly called?

    Answer: DC-to-AC ratio (or clipping ratio)

    The DC-to-AC ratio (also called inverter loading ratio) compares total array STC wattage to the inverter's rated AC output, typically ranging from 1.1 to 1.3.

  3. A PV system designer calculates 8,500 kWh of annual production but the customer uses 10,200 kWh/year. What is the system's offset percentage?

    Answer: 83%

    Offset = (8,500 / 10,200) × 100 ≈ 83%, meaning the system covers approximately 83% of the customer's annual electricity usage.

  4. What does MPPT stand for in solar inverter technology?

    Answer: Maximum Power Point Tracking

    MPPT (Maximum Power Point Tracking) is an algorithm that continuously adjusts electrical operating conditions to extract maximum power from PV modules.

  5. In shade analysis for PV system design, what tool is commonly used to assess shading at a specific site?

    Answer: Solar Pathfinder or SunEye device

    Devices like the Solar Pathfinder or Solmetric SunEye capture a hemispherical view of the sky to identify shading obstructions throughout the year.

  6. Which of the following best describes 'soiling loss' in a PV system?

    Answer: Reduction in energy output caused by dirt, dust, or debris on module surfaces

    Soiling loss refers to reduced energy production caused by dust, bird droppings, pollen, or other contaminants blocking sunlight from reaching PV cells.

  7. For a roof-mounted system in a high-wind zone (ASCE 7 150 mph), what design aspect becomes especially critical?

    Answer: Racking and attachment hardware wind uplift capacity

    In high-wind zones, racking and attachment hardware must be engineered to resist significant wind uplift forces to prevent array detachment.