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Battery autonomy is the period of time a UPS battery will last for at a specified load level in the event of a power outage.  

Autonomy can also be referred to as backup, discharge time, or runtime. It is a function of battery charge state, load size, and capacity. 

UPS battery autonomy can support loads for just a few minutes through to several hours, although for longer runtime applications, it is more cost-effective to combine a UPS with a backup generator. 

Adding extra battery strings connected in parallel will increase autonomy, although it is important to consider the charging capabilities of the UPS. 

 

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