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Technical Specifications 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 Technical Specifications flashcards as text

  1. Which standard covers design qualification and type approval (reliability testing) of terrestrial PV modules?

    Answer: IEC 61215

    IEC 61215 covers performance and durability testing, while IEC/UL 61730 covers module safety.

  2. A datasheet lists a mechanical load rating of '5400 Pa front / 2400 Pa rear'. The front rating mainly addresses:

    Answer: Snow loading

    Front-side (downward) load represents snow, and rear-side load represents wind uplift.

  3. A battery has a nominal capacity of 10 kWh and a rated depth of discharge of 90%. What is its usable capacity?

    Answer: 9.0 kWh

    Usable capacity = 10 kWh × 0.90 = 9.0 kWh.

  4. What does round-trip efficiency on a battery storage datasheet represent?

    Answer: Energy delivered on discharge divided by energy supplied on charge

    Round-trip efficiency is the share of charging energy recovered on discharge, typically 85-95% for lithium-ion systems.

  5. Which standard is the safety listing for complete energy storage systems, with a related test method for thermal runaway fire propagation?

    Answer: UL 9540 / UL 9540A

    UL 9540 lists ESS equipment, and UL 9540A is the test method for thermal runaway fire propagation.

  6. A warranty guarantees 98% of power in year 1, then a 0.55%/year decline. What minimum power is guaranteed at the end of year 25?

    Answer: 84.8%

    98% - (24 × 0.55%) = 98% - 13.2% = 84.8%.

  7. In the IP68 rating of a junction box, what does the first digit '6' indicate?

    Answer: Completely dust-tight

    The first IP digit covers solids, and 6 means fully dust-tight; the second digit, 8, covers continuous water immersion.