NABCEP Site Assessment 4

Question 1

During a site assessment, the installer identifies that the nearest obstruction (a chimney) casts a shadow on the proposed array location during the critical solar window. What is the critical solar window?

Accepted Answer

10 AM to 2 PM solar time on the winter solstice

Answer

The critical solar window is 10 AM to 2 PM solar time on the winter solstice, when the sun is at its lowest and shading is most impactful to annual energy production.

Question 2

A site is located at 40° N latitude. For a fixed-tilt south-facing array optimized for annual energy production, the ideal tilt angle is approximately:

Accepted Answer

40 degrees

Answer

For annual energy optimization, a fixed-tilt array is typically tilted at an angle approximately equal to the site's latitude, so 40° is the standard approximation.

Question 3

What is the primary reason for conducting a load analysis as part of a residential solar site assessment?

Accepted Answer

To size the system appropriately to offset the customer's energy consumption

Answer

Analyzing the customer's electrical load data (utility bills) allows the system to be sized to match actual energy consumption, optimizing both economics and utility approval.

Question 4

When assessing a site in a coastal environment, which additional consideration is MOST important for equipment selection?

Accepted Answer

Salt air corrosion resistance of mounting hardware and module frames

Answer

Coastal salt air accelerates corrosion of metal components; equipment with appropriate corrosion-resistant ratings (e.g., stainless steel, anodized aluminum) must be specified.

Question 5

What is the purpose of reviewing historical utility bills during a solar site assessment?

Accepted Answer

To establish baseline energy usage for accurate system sizing

Answer

Historical utility bills reveal annual and seasonal energy consumption patterns, which are essential for accurately sizing the solar system to meet the customer's needs.

(NABCEP) North American Board of Certified Energy Practitioners Solar Practice Test

(NABCEP) North American Board of Certified Energy Practitioners Solar Practice Test

NABCEP Site Assessment 4