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I am building a NAS (build thread here) and still need to purchase a UPS. I have a rough idea what I need, but I want to make sure that I'm not missing any of the finer points.
The porpose of the UPS is essentially to give the system the minute or so needed to gracefully power down the NAS in the event of a power interruption.
From what I understand, I'm essentially looking at a line-interactive UPS with USB communications port and a pure sine output because the PSU I bought has Active PFC. Online UPS are much more money, less efficient and from what I understand, and unnecesary with regards to switchover time because from what I understand PSU's usually tolerate the <10 ms switchover time of the majority of line-interactive UPS. I haven't come across much information about offline UPS. I'm not actually sure how brownouts affect modern PSU's. Even though I've never had an issue with brownouts in the area, I'm not sure I would want to risk that with an offline UPS.
I took a look at the used UPS market in the surrounding area and found one ̶t̶h̶r̶e̶e̶ possible contender(s).
Because option 2 is a good deal and will provide sufficient power to the NAS at all times except perhaps power-on. I am wondering if, as a line-interactive UPS, it would be suitible for my application. It is also a current APC model and appears to be of better quality than the other two (although I'm note entirely sure why that is). The largest difference that I could spot was that the output is a pure sine wave.
We know that the power draw after the disks have spun up is significantly less than the start-up power draw. If the required power exceeds the rated output of the UPS only during start-up, does that mean that I will only be unable to start-up when the UPS is operating off the battery, or does it mean that I would be unable to turn on the computer while it is plugged into the UPS, regardless of whether the UPS is not running off the batteries? For example, the PSU I bought is 660W and the maximum draw from the PSU is something like 750 W (660W/eff.), so a 780 W UPS will a never have any issues in this regard. However, let's say that after upgrading to 12 spinning disk in the NAS that the power-on wattage requirement is more than 500 W. Will this system boot when plugged into the UPS as long at power is running to it (i.e. the UPS is not running off battery)?
If this used UPS isn't a viable option, what would you suggest to buy new?
The porpose of the UPS is essentially to give the system the minute or so needed to gracefully power down the NAS in the event of a power interruption.
From what I understand, I'm essentially looking at a line-interactive UPS with USB communications port and a pure sine output because the PSU I bought has Active PFC. Online UPS are much more money, less efficient and from what I understand, and unnecesary with regards to switchover time because from what I understand PSU's usually tolerate the <10 ms switchover time of the majority of line-interactive UPS. I haven't come across much information about offline UPS. I'm not actually sure how brownouts affect modern PSU's. Even though I've never had an issue with brownouts in the area, I'm not sure I would want to risk that with an offline UPS.
I took a look at the used UPS market in the surrounding area and found one ̶t̶h̶r̶e̶e̶ possible contender(s).
- ̶A̶P̶C̶ ̶B̶A̶C̶K̶-̶U̶P̶S̶ ̶X̶S̶ ̶1̶3̶0̶0̶V̶A̶ ̶L̶C̶D̶ ̶1̶2̶0̶V̶ ̶B̶X̶1̶3̶0̶0̶L̶C̶D̶ ̶|̶ ̶$̶1̶0̶0̶ ̶|̶ ̶7̶8̶0̶ ̶W̶a̶t̶t̶s̶ ̶/̶ ̶1̶3̶0̶0̶ ̶V̶A̶ ̶|̶ ̶W̶a̶v̶e̶f̶o̶r̶m̶ ̶T̶y̶p̶e̶:̶ ̶S̶t̶e̶p̶p̶e̶d̶ ̶a̶p̶p̶r̶o̶x̶i̶m̶a̶t̶i̶o̶n̶ ̶t̶o̶ ̶a̶ ̶s̶i̶n̶e̶w̶a̶v̶e̶ ̶|̶ ̶N̶e̶w̶ ̶b̶a̶t̶t̶e̶r̶y̶ ̶|̶ ̶R̶J̶-̶4̶5̶ ̶t̶o̶ ̶U̶S̶B̶
- APC Smart-UPS 750VA USB & Serial 120V SUA750 | $220 | 500 Watts / 750 VA | Waveform Type: Sine wave | Minimal use during a flood last year | USB port |
- ̶A̶P̶C̶ ̶B̶A̶C̶K̶-̶U̶P̶S̶ ̶1̶2̶0̶0̶V̶A̶ ̶1̶2̶0̶V̶ ̶B̶R̶1̶2̶0̶0̶ ̶|̶ ̶$̶2̶5̶0̶ ̶|̶ ̶7̶8̶0̶ ̶W̶a̶t̶t̶s̶ ̶/̶ ̶1̶2̶0̶0̶ ̶V̶A̶ ̶|̶ ̶O̶n̶-̶b̶a̶t̶t̶e̶r̶y̶ ̶W̶a̶v̶e̶s̶h̶a̶p̶e̶:̶ ̶S̶t̶e̶p̶p̶e̶d̶ ̶S̶i̶n̶e̶ ̶W̶a̶v̶e̶ ̶|̶ ̶B̶a̶t̶t̶e̶r̶y̶ ̶c̶o̶n̶d̶i̶t̶i̶o̶n̶ ̶n̶o̶t̶ ̶i̶n̶d̶i̶c̶a̶t̶e̶d̶ ̶|̶ ̶R̶J̶-̶4̶5̶ ̶t̶o̶ ̶U̶S̶B̶?̶ ̶|̶
Because option 2 is a good deal and will provide sufficient power to the NAS at all times except perhaps power-on. I am wondering if, as a line-interactive UPS, it would be suitible for my application. It is also a current APC model and appears to be of better quality than the other two (although I'm note entirely sure why that is). The largest difference that I could spot was that the output is a pure sine wave.
We know that the power draw after the disks have spun up is significantly less than the start-up power draw. If the required power exceeds the rated output of the UPS only during start-up, does that mean that I will only be unable to start-up when the UPS is operating off the battery, or does it mean that I would be unable to turn on the computer while it is plugged into the UPS, regardless of whether the UPS is not running off the batteries? For example, the PSU I bought is 660W and the maximum draw from the PSU is something like 750 W (660W/eff.), so a 780 W UPS will a never have any issues in this regard. However, let's say that after upgrading to 12 spinning disk in the NAS that the power-on wattage requirement is more than 500 W. Will this system boot when plugged into the UPS as long at power is running to it (i.e. the UPS is not running off battery)?
If this used UPS isn't a viable option, what would you suggest to buy new?
