Your roof may not be angled in an ideal way to take advantage of your solar resources. If you live in a snowy climate, they won’t generate power in the winter. There might be a maintenence cost. Some people may not like to the look of them. Also you will need some sort of energy storage system to make use of surplus power unless you are selling power back to the grid.
The main issues are properly sizing the photovoltaic system for your present and future needs, storage and the meter feedback rules in your state. Also, if your property is subject to homeowner association rules, your options for a system might be limited. And neighborhood trees may block the best sun for an installation.
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