Practice Test GeeksSE Engr. - Solar Energy Engineering Certification Practice Test
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Energy Storage and Grid Integration Flashcards

7 cards from real SE ENGR. 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 and Grid Integration flashcards as text

  1. An off-grid system needs 10 kWh/day with 2 days of autonomy, 80% DoD, and 90% battery efficiency. What is the minimum nominal battery capacity?

    Answer: 27.8 kWh

    20 kWh / (0.8 x 0.9) = 27.8 kWh nominal capacity.

  2. A commercial customer uses a BESS for peak shaving. Which utility bill component does this primarily reduce?

    Answer: Demand charges

    Peak shaving lowers the maximum kW drawn, which sets demand charges.

  3. What does energy arbitrage with a BESS involve?

    Answer: Charging when prices are low and discharging when prices are high

    Arbitrage captures price spreads by shifting energy from low-price to high-price periods.

  4. A 48 V, 400 Ah battery bank is limited to 80% DoD. What is its usable energy?

    Answer: 15.36 kWh

    48 V x 400 Ah = 19.2 kWh; 19.2 x 0.8 = 15.36 kWh usable.

  5. How do cold ambient temperatures typically affect battery storage performance?

    Answer: Reduce available capacity and charge acceptance

    Low temperatures slow electrochemical reactions, reducing capacity and limiting safe charging rates.

  6. Under the Inflation Reduction Act, which change applied to the federal ITC for storage beginning in 2023?

    Answer: Standalone storage of at least 5 kWh became eligible

    The IRA made standalone storage (3 kWh residential, 5 kWh commercial minimum) eligible without a solar-charging requirement.

  7. Battery end of life for warranty purposes is commonly defined when capacity falls to what fraction of original?

    Answer: 70-80%

    Most stationary battery warranties define end of life at roughly 70-80% retained capacity.