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Aaron, if you add together the power consumption of the two appliances and determine the total wattage. Divide that into the 900W and you will have the time it will last. Generally these appliances are light power consumers, so you would expect a good long time if those appliances are all that's running off the Backup UPS
Sorry, there was a problem. Please try again later.Thank you for your interest in our products. You would get around 1 hour and 30 minutes of runtime with this your modem and router connected to the UPS.
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