Final answer:
When adjusting the three-unit control panel, the voltage regulator is fine-tuned, often using micro-inverters to ensure that each panel's output is combined in parallel, improving solar power system efficiency.
Step-by-step explanation:
When adjusting the three-unit control panel, the voltage regulator is adjusted to ensure the proper voltage output from each unit. This problem of voltage irregularity is sometimes mitigated via micro-inverters: each panel has an inverter so that higher-voltage outputs are combined in parallel. This technology allows each panel to operate independently, which can increase the overall efficiency of a solar power system and mitigate the effects of shading or panel degradation on the performance of other panels in the array.