NABCEP Technical Sales Practice Exam – Practice Test, Prep & Study Guide

When the size of the solar array is decreased, it directly impacts the charging capacity of the system. A smaller solar array generates less electricity, which means that the energy being supplied to the battery for storage will be reduced. As a result, the battery may not be charged to its full capacity.

This limited charging can lead to more frequent cycling of the battery—the process of discharging and then recharging. Batteries have a finite number of cycles they can undergo, and excessive cycling can lead to increased wear and tear. If the battery is not adequately charged, it may also go through deeper discharges, which can shorten its lifespan. Therefore, decreasing the size of the solar array typically leads to decreased battery life due to these factors, making it the correct answer.

The other aspects of battery performance, such as whether it alternates battery cycling or has no overall effect, do not accurately capture the relationship between the size of the solar array and the lifespan of the battery under normal operating conditions.