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The longest you could get would be to divide the UPS 900 watts by the watts drawn by your devices.
Sorry, there was a problem. Please try again later.I have a lot of equipment connected to my UPS. Using the PowerChute application on my PC I am using 170 watts and have 37 minutes of up time. I would think with your low load you would have over 2 hours. Even if your PC is not attached you can still install PowerChute on it and connect it to the UPS with the supplied USB connector and see your power usage.
Sorry, there was a problem. Please try again later.This is a pretty heavy duty UPS. Providing power for just a modem and a router, I'd expect it to keep them going somewhere between ten and a hundred hours. In any case, if you have laptop computers connected to your router, the batteries in the laptops will probably run dry before this UPS leaves your modem and router with no juice. There'll be power left over to charge your cell phone a time or three.
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