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Forum Discussion
UPS for ReadyNAS 6 + ReadyNAS Duo
Hi guys, This forum seems to have loads of info, but also way too much info! I've searched around but can't find the answers I need. I'd like to get a UPS for my pair of ReadyNAS devices. I have: ...
My post has a repetitive typo error. The 1500VA unit is indeed 865 Watts and where I stated 1350W it should have been 1350VA which would have the power of 780 Watts and where I have 700W it should be 700VA which would have the power of approximately 420 Watts. These units have a power factor (Watts/VA) of approximately 60% and ideal perfection would be 100%. (In DC Watts = VA or 100%, but it is the VA that matches watts not the other way around).
So my 865 Watts UPS (1500VA) with a load of 116 Watts (13.4%) yields a run time of 48 minutes.
That same load on a 780 Watts UPS (1350VA) would be as you have calculated 14.9% and approximately 40 minutes or less.
However, your line for 700W should actually be 420 Watts (700VA, the original spec you posted) calculates to 27.6% of the load and about 24 minutes or less run time.
I checked my 1250VA (750 Watts) APC UPS which powers my PC, Monitor and fluorescent desk lamp and as I discovered during a power outage, a laser printer and inkjet printer as well. The load indicated was 184 watts or a load 24.5% of capacity and it gave me a run time of 22 minutes. Turning off the two printers (which had been in stand-by) dropped the load to 166 watts and flipped the numbers with the load at 22.1% of capacity and the run time now at 25 minutes.
StephenB is most likely correct in that the higher the load the faster the run time drops as it would not be linear. That is why I usually opt for bigger units to get the load percentage down. One of the reasons I added a third UPS was to increase the run time for my units, the other was to move the NAS units into another room. When I had the NAS units along with the PC, monitor, etc, all on the 1250VA unit, when I had a power outage and was sitting her I looked at the panel on the UPS and it was indicating a run time of 10 minutes and started counting down rather quickly. I manually shut everything down. Adding the 116 Watts to the 184 Watts gives me about a 300 Watt load or 40% of the 750 Watts power of the UPS and a run time of 10 minutes.
I would recommend you try to keep your power load at 20% or less. For approximately 120 Watts that would indicate a UPS of 600 Watts or approximately 1000VA or better.
So my 865 Watts UPS (1500VA) with a load of 116 Watts (13.4%) yields a run time of 48 minutes.
That same load on a 780 Watts UPS (1350VA) would be as you have calculated 14.9% and approximately 40 minutes or less.
However, your line for 700W should actually be 420 Watts (700VA, the original spec you posted) calculates to 27.6% of the load and about 24 minutes or less run time.
I checked my 1250VA (750 Watts) APC UPS which powers my PC, Monitor and fluorescent desk lamp and as I discovered during a power outage, a laser printer and inkjet printer as well. The load indicated was 184 watts or a load 24.5% of capacity and it gave me a run time of 22 minutes. Turning off the two printers (which had been in stand-by) dropped the load to 166 watts and flipped the numbers with the load at 22.1% of capacity and the run time now at 25 minutes.
StephenB is most likely correct in that the higher the load the faster the run time drops as it would not be linear. That is why I usually opt for bigger units to get the load percentage down. One of the reasons I added a third UPS was to increase the run time for my units, the other was to move the NAS units into another room. When I had the NAS units along with the PC, monitor, etc, all on the 1250VA unit, when I had a power outage and was sitting her I looked at the panel on the UPS and it was indicating a run time of 10 minutes and started counting down rather quickly. I manually shut everything down. Adding the 116 Watts to the 184 Watts gives me about a 300 Watt load or 40% of the 750 Watts power of the UPS and a run time of 10 minutes.
I would recommend you try to keep your power load at 20% or less. For approximately 120 Watts that would indicate a UPS of 600 Watts or approximately 1000VA or better.
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