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uninterrupt power supply is mainly use for short time .means according to ups VA it gives backup.

ups is also two types :

  1. on line.
  2. offline.

online ups having high volt and amp for long time backup with with high dc voltage.but ups start with 2v dc with 7 amp. but inverter is startwith 2v,24,dc to 36v dc and 20amp to 80amp battery with long time backup. 

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