How Long Will a 600VA UPS Last?

Answer
12m at half load (180 W)

A typical 600VA UPS is rated about 360 W and uses 1 × 12 V 7 Ah battery. At half load (180 W) it runs about 12m. Lighter loads last much longer: about 14m with an office PC and monitor (150 W) and 2h 43m with just a router and modem (20 W).

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W
Sum of connected equipment.
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V
Two 12 V batteries = 24 V.
Ah
%
Runtime
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How we calculated this

    For estimating and educational purposes only. Results are approximate and are not a substitute for a licensed professional, the manufacturer's instructions or your local code. Disclaimer

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    600VA UPS runtime by load

    EquipmentLoadRuntimeUPS load
    Router + modem20 W2h 43m6%
    Router, modem + 2 cameras50 W54m14%
    Laptop + router100 W24m28%
    Office PC + monitor150 W14m42%
    NVR with 8 cameras200 W10m56%
    Desktop PC + 2 monitors300 W6m83%

    Estimates for new batteries at 25 °C and 90% inverter efficiency, using Peukert's law (k = 1.2). Battery packs vary by brand: check yours and enter it in the calculator. Batteries older than 3 years can deliver half of this.

    Frequently asked questions

    How long will a 600VA UPS run a computer?

    About 14m for an office PC with a monitor (150 W) and 6m for a desktop with two monitors (300 W).

    Why does half the load give more than double the runtime?

    Lead-acid batteries deliver less of their rated capacity at high current (Peukert effect). At light loads you get close to the full Wh; at heavy loads much less.

    How much load can a 600VA UPS take?

    Its rating is about 360 W. Keep the load under 80% (288 W) so the inverter and batteries are not stressed.

    Open the full calculator: UPS Runtime Calculator →