REP Solar Energy Systems 2

Question 1

What is the primary function of a bypass diode in a photovoltaic module?

Accepted Answer

Prevent reverse current flow through shaded cells

Answer

Increase voltage output

Answer

Regulate charge to the battery

Answer

Boost panel efficiency in low light

Question 2

Which solar resource metric best represents the equivalent number of peak sun hours at a site?

Accepted Answer

Plane of Array (POA) irradiance

Answer

Global Horizontal Irradiance (GHI)

Answer

Direct Normal Irradiance (DNI)

Answer

Diffuse Horizontal Irradiance (DHI)

Question 3

A string of 12 PV modules each rated at 40V open-circuit voltage is connected in series. What is the maximum string open-circuit voltage?

Accepted Answer

480 V

Answer

40 V

Answer

240 V

Answer

520 V

Question 4

What does a solar inverter's 'anti-islanding' protection do?

Accepted Answer

Shuts down the inverter when grid power is lost

Answer

Prevents battery over-discharge

Answer

Maximizes power from the array

Answer

Balances loads across phases

Question 5

In a grid-tied PV system, what component is responsible for maximum power point tracking (MPPT)?

Accepted Answer

Inverter or charge controller

Answer

Combiner box

Answer

Disconnect switch

Answer

Net meter

Question 6

Which orientation yields the highest annual energy production for a fixed-tilt PV system installed in the continental United States?

Accepted Answer

South-facing at latitude angle

Answer

East-facing at 30°

Answer

West-facing at 30°

Answer

North-facing at 20°

Question 7

What is the purpose of a combiner box in a large PV array?

Accepted Answer

Combine multiple string circuits and provide overcurrent protection

Answer

Convert DC to AC power

Answer

Monitor inverter performance

Answer

Regulate voltage to the utility grid