The first is your payback period, in which you calculate the cost of installing solar panels after tax credits and incentives and divide that by how much money in energy costs you expect to save each year. Installation for most solar panel systems requires drilling holes through your roof and into the joists that support it. This is necessary to keep your solar panels securely attached, but you'll want to ask your solar installer how long it guarantees those penetrations will remain watertight to keep your home secure.



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