But first, the misconceptions.
When power goes out in an area, the power will go out for solar and non-solar homes alike. Thus, in the usual configuration, solar panels do not make a house energy-independent.
Safety is the main reason: The equipment cuts off the solar generators when the line goes down so the house doesn't inadvertently electrocute linemen trying to fix a problem. Also, solar energy doesn't work at night, so most systems stay connected to the grid -- homeowners would need to spend another $5,000 or more on battery backup.
By the way you can have back up power for less than this but for a commercial grade system a big boy this is probably true.
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