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UPS meaning a uninterrupted power supply and I will be using it to run a power head for an aquarium which is only 6 watts
And got the following answer:
If the UPS is line powered, it will run the appliance indefinitely. When power is lost, the appliance will run until the UPS battery is run down. To find out how long that will be you need to find the amp hour rating of the battery in the UPS. Given that your unit is rated at 650VA, it will likely have a wattage output between 50% and 60% of that number and an amp-hour rating of 10 -12. Assuming it's not brand new, a conservative estimate would be 325 Watts and 10 Ah. The 10 Amp-hour rating might lead you to think that something drawing only 6/110 = 0.055 A would run for a very long time, like 180 hours, but that is most unlikely because of the various efficiency losses in the system. Amp-hour ratings are non-linear and are developed at less than maximum discharge rates. A UPS will typically stop providing power in 2-3 minutes at full load and 9 -11 minutes at half load. If we assume 10 minutes at 150 Watts drain and that the battery at half load is on the linear part of the curve, at 6 watts, it could be good for as long as 4 to 5 hours. While this does not mean the battery is fully discharged, it does mean that it can no longer provide regulated AC output, but 4-5 hours is very different from 180! So unless you have rating data for the battery at various discharge rates, the only way to be sure is to run one full cycle and time it. http://battery-backup-review.toptenreviews.com/