During on-site renewable energy generation evaluations, which factors are considered?

During on-site renewable energy generation evaluations, several key factors must be assessed to ensure the viability and effectiveness of the system being considered. Energy output is critical as it determines how much energy the renewable system can produce, directly impacting the building's energy consumption and sustainability goals. Site feasibility involves evaluating the physical and environmental characteristics of the location, including factors like space, orientation, and surrounding structures that may affect energy capture (for example, solar panels may require unobstructed sunlight). System efficiency refers to how effectively the technology converts the renewable resource (such as sunlight for solar panels or wind for turbines) into usable energy, impacting the overall performance and return on investment.

While the other options contain important considerations for the broader evaluation of renewable energy projects, they do not focus primarily on the specific aspects of energy generation performance on-site. Factors like cost, installation duration, and maintenance (as listed in another choice) are certainly crucial for project feasibility and planning but do not directly pertain to the energy generation evaluation itself. Thus, the combination of energy output, site feasibility, and system efficiency is essential for determining the suitability and effectiveness of renewable energy systems at a specific site.