For Autonomous System we have terms and definitions in 2 topics. The topics are Electric Power and Solar Energy.

A stand-alone Photovoltaic system that has no back-up generating source. May or may not include storage batteries.
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A stand-alone PV system that has no back-up generating source. May or may not include storage batteries. Most battery systems are designed for a certain minimum "days of autonomy" - which means that the batteries can supply sufficient power with no sunlight to charge the batteries. This varies from 3-5 days in the sunbelt, to 5 to 10 days elsewhere.
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