As the name suggests, Stand-Alone systems are meant to supply all of the electricity needed without drawing power from the grid (the power company). This requires storing power in a battery bank for overnight use. These systems are best suited for locations where utility power is not available or is prohibitively expensive. They should be designed to meet maximum power needs on the shortest day of the year, and have sufficient storage to last a minimum of 3 to 5 days with no energy production.
See details on AZ State and Federal Solar Tax Credits
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