Consider two factories in the same industrial area, installing similar-capacity rooftop systems with panels from the same manufacturer. One EPC company conducts a shadow analysis and designs the array around a water tank that casts shade for two hours daily. The other skips this step to save time. A year later, the first factory’s system performs close to its projected output, while the second sees a generation shortfall that takes months to diagnose, because the panels were never the problem.

In another common scenario, a business owner picks the lowest-cost installer to save on the quote. Six months in, they’re dealing with loose mounting structures, a frequently tripping inverter, and an installer who is hard to reach for support. The money saved upfront gets spent several times over in repairs and lost generation.