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  • Advice on UPS Calculation: Correct UPS sizing for a PA System

    Nate Ho

    Nate Ho

    @nate-ho-5KRpDr
    Updated: Oct 26, 2024
    Views: 1.2K
    Hello Fellow Engineers,

    I am having trouble coming up with the correct UPS sizing for a PA System.
    Here are the specification.
    Amplifier:
    Battery power consumption-
    Idle - 0.09A , Standby - 0.23A , Max - 13A
    Main Power Supply-
    Idle - 5w , standby - 13w , Max - 1000w

    eg .I have a max loud speaker loading of 400W
    i got 2 controllers with each controller consuming 48W.
    Now it is fairly easy to just use the max wattage multiply by 1.25 to get the Kva. but however
    i also have to take the following details into consideration:

    Evacuation time = 1/2 hours
    Paging time = 1/2 hours
    UPS duration = 2 hours

    how do i determine the correct battery capacity and UPS Size?
    I thank you all in advance for your help.
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