HERS Renewable Energy Systems 2

Question 1

Which solar panel configuration allows individual panels to operate independently, minimizing the impact of shading on the overall system output?

Accepted Answer

Microinverter or DC optimizer configuration

Answer

Microinverters and DC optimizers allow each panel to operate at its maximum power point independently, so shading on one panel does not drag down the entire string.

Question 2

In a grid-tied solar PV system, what happens to electricity production during a utility grid outage without battery backup?

Accepted Answer

The system shuts down to prevent islanding hazards

Answer

Grid-tied inverters are required by code to shut down during grid outages to prevent islanding, which could endanger utility workers.

Question 3

What is the primary purpose of a solar site assessment tool like a Solar Pathfinder or Solmetric SunEye?

Accepted Answer

Evaluating shading impacts and solar access at a specific location

Answer

These tools map the sun's path and identify obstructions that cast shadows, allowing raters to quantify solar access and expected energy production.

Question 4

According to RESNET standards, what solar production data source is commonly used to model PV output in energy rating software?

Accepted Answer

TMY (Typical Meteorological Year) weather data

Answer

TMY data provides hourly weather data representative of long-term average conditions and is the standard input for solar energy production modeling.

Question 5

When calculating the HERS Index for a home with a solar PV system, how is on-site renewable generation typically credited?

Accepted Answer

It offsets site energy use, reducing the HERS score

Answer

Under RESNET standards, PV generation offsets the home's site energy consumption and is credited when calculating the HERS Index.

(HERS) Home Energy Rater Certification Practice Test

(HERS) Home Energy Rater Certification Practice Test

HERS Renewable Energy Systems 2