SE Engr. Technical Specifications 5

Question 1

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

Accepted Answer

IEC 61215

Answer

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

Question 2

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

Accepted Answer

Snow loading

Answer

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

Question 3

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

Accepted Answer

9.0 kWh

Answer

Usable capacity = 10 kWh × 0.90 = 9.0 kWh.

Question 4

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

Accepted Answer

Energy delivered on discharge divided by energy supplied on charge

Answer

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

Question 5

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

Accepted Answer

UL 9540 / UL 9540A

Answer

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

SE Engr. - Solar Energy Engineering Certification Practice Test