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Almost all UPS equipment interprets a stepped sine wave as bad power. Therefore, as soon as the first UPS goes on battery and outputs a stepped sine wave, the second UPS in the series will read that input as bad power and convert to battery also. With both UPS systems running on battery at the same time, there is no increase in battery capacity.
If a UPS lasts long enough, the cost of replacement batteries overruns the initial cost. If you are buying quality UPSes, therefore, give more consideration to the running cost of the UPS than to the initial purchase price.⁶. A midrange UPS from the same manufacturer costs about ⅓ that of a true-sine UPS with the same headline specs.
You can use production tracking numbers on the UPS test environment. Moreover, on the Appendix H of the Tracking Web Service Developers Guide (December 31, 2012) , you can find a list of tracking numbers that can be useful if you want see tracking numbers with different set of information like proof of delivery .
Some new information for an old thread. Your UPS should be capable of providing the max potential draw of your PSU. I mean, the entire point of the UPS is to protect your data so it should not be the weak link in the chain of components. Also, the price jump to a higher rated UPS isn't that much in the scheme of things.
Any decent UPS is also a voltage regulator, because it creates a regulated output, regardless of what the input is doing (of course, presuming the UPS battery has been charged). Unless your mains voltage fluctuates wildly (drops too much below/above the input specs of the UPS regularly), in which case you put the regulator before the UPS and ...
If the UPS has battery for only few minutes of full-load operation, it may have been designed with inadequate cooling. It may be possible that running it for few hours could overheat it at full load. Note that if you double the battery capacity, you more than double the runtime, as a result of Peukert's effect.
The typical (standby and line-interactive) UPS will pass through the line power when in normal mode. Typically only a high-quality UPS will output true sinusoidal AC power when in battery mode. A UPS of lesser quality will convert the DC battery power to a simulated sinusoidal AC wave.
The UPS still counts down from about 4 minutes after the AC power is removed, but continues to power-up the equipment for at least another 30 minutes from the external battery, after reaching zero. However, the display panel remains at 0% and we have no way of knowing how long the external pack would last us.
Such UPS units come with batteries (typically Lead Acid) that can sit on charge all the time. The sizing of the UPS should be 50 to 100 percent higher power capacity than the normally top load of the PC. The unit you have appears to be too small as the computer may use higher power than the UPS unit can supply.
(1)"For me it was just the wrong access code, I needed the xml access code.I also had to go back to the UPS site and request an XML Access Key (Code) rather than the HTML Access Key that I first used in the "UPS access code" field for the UPS module. Now works - or at least displays the UPS shipping options in checkout." (2)"Mine's solved.