SE Engr. Technical Specifications 2

Question 1

Which set of conditions defines Standard Test Conditions (STC) for PV module ratings?

Accepted Answer

1000 W/m², 25°C cell temperature, AM1.5 spectrum

Answer

STC specifies 1000 W/m² irradiance, 25°C cell temperature, and an AM1.5 spectrum.

Question 2

NOCT (Nominal Operating Cell Temperature) is measured under which conditions?

Accepted Answer

800 W/m², 20°C ambient, 1 m/s wind, open-rack mounting

Answer

NOCT uses 800 W/m² irradiance, 20°C ambient air, 1 m/s wind, and open-rack mounting, and typically gives cell temperatures around 41-46°C.

Question 3

A typical crystalline silicon module datasheet lists a Pmax temperature coefficient of about:

Accepted Answer

-0.35 %/°C

Answer

Crystalline silicon modules usually lose about 0.29-0.40% of their power for each °C above 25°C.

Question 4

How is a PV module's fill factor calculated?

Accepted Answer

(Vmp × Imp) / (Voc × Isc)

Answer

Fill factor is the maximum power (Vmp × Imp) divided by the product of Voc and Isc.

Question 5

A module datasheet lists a power tolerance of '0/+5 W'. What does this mean?

Accepted Answer

Delivered modules will measure at or above nameplate power, by up to 5 W

Answer

A positive-only tolerance means flash-tested power is never below the nameplate rating.

SE Engr. - Solar Energy Engineering Certification Practice Test