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Check the power output of your modem and use the calculator on the apc website to get an estimate. https://www.apc.com/shop/us/en/tools/ups_selector/home/load
Sorry, there was a problem. Please try again later.Thank you for your interest in our products. The runtime would really depend on how much power the device draws. If it is around 50 watts you should get around 2 hours of runtime. If the power draw is higher from the modem then the runtime will be shorter.
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