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

  1. When sizing a battery bank for a 3-day autonomy requirement with a daily load of 6 kWh and a maximum depth of discharge of 50%, what minimum capacity is required?

    Answer: 36 kWh

    Required capacity = (daily load × days) / DoD = (6 kWh × 3) / 0.50 = 36 kWh.

  2. What is the term for the gradual reduction in a battery's maximum capacity over repeated charge-discharge cycles?

    Answer: Cycle degradation

    Cycle degradation refers to the loss of battery capacity that occurs incrementally with each charge-discharge cycle due to physical and chemical changes in the electrodes.

  3. In a DC-coupled battery storage system, the battery charge controller is connected between the PV array and the battery bank. What is a key advantage of this configuration?

    Answer: Higher overall system efficiency due to a single DC-to-AC conversion

    DC-coupled systems avoid a double conversion (DC→AC→DC) when charging the battery from solar, resulting in higher overall efficiency.

  4. Which temperature condition most severely reduces the available capacity of a lead-acid battery?

    Answer: Low temperatures below 0°C

    Cold temperatures significantly reduce lead-acid battery capacity because the chemical reactions slow down, making less energy available for discharge.

  5. A battery-based inverter/charger is classified as a 'multimode inverter.' What capability does this describe?

    Answer: Functioning in both grid-tied and off-grid modes

    A multimode inverter can operate in grid-tied mode, switch to off-grid (island) mode during outages, and transition seamlessly between the two.

  6. What safety feature is required by NEC 706.15 at the point where an energy storage system connects to the rest of the electrical system?

    Answer: A readily accessible disconnecting means

    NEC 706.15 requires a readily accessible disconnecting means at the point of connection to allow safe isolation of the energy storage system.

  7. Which parameter describes how quickly a battery can be charged or discharged relative to its total capacity?

    Answer: C-rate

    C-rate expresses the charge or discharge current relative to battery capacity; a 1C rate would fully charge or discharge the battery in one hour.