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How to determine the right solar system for your needs.
There is no single optimum size solar energy system for each house. The right system for you will be a function of your available un-shaded roof or ground area, your present level of energy use, and your investment budget.
Available Space
Many homes do not have enough roof space to fit a solar array that will provide 100% of the house’s energy needs. The solar electric systems being installed on homes typically provide from 40% to 90% of a home’s annual electric usage. Solar hot water systems typically provide 70% of a home's annual hot water demand. The most important factor in determining available space for the solar arrays is to ensure that there will be little or no shading from trees or adjacent buildings. If there is some unavoidable shading, the extent of shading will be determined to accurately calculate the expected total annual solar output.
Solar arrays need not be located on the roof and can be located on a metal frame at ground level in an un-shaded location. If there is adequate land available, the solar array can be oriented due south for maximum performance and efficiency. Locating the solar array on the ground behind the house can sometimes address a challenging roof approach or a house that has extensive tree shading.
System Sizing
In choosing an appropriately sized solar system one should make sure that the system chosen will not supply more than the home’s total annual electric usage. Any amount produced in excess will be paid for by the utility at its wholesale cost, a fraction of the residential retail electric rate.
Investment Budget
Solar energy systems vary widely in cost. After subsidies, solar electric systems average $10K - 25K, and solar hot water systems average $5K - 10K. |
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