Theoretically, solar systems of any size will have the same payback period. Though larger systems will provide more energy, they also have a larger initial cost. However, in general, smaller systems (i.e. a single solar panel on a rooftop) will pay off quicker because there is less energy lost in transmission. Very important to consider is the quality and quantity of the sun’s rays hitting the solar panels – consistent, bright sunlight will result in a faster payback period.
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