Oh wow, that is online, double-conversion UPS. It is actually better than the line-interactive topology UPS that i'm using. But since it also costs more, i didn't have money to buy online, double-conversion UPS (+ the maintenance cost of owning one).
While online, delta-conversion UPS is the best topology there is (at least at current date).
Also, in my opinion, every PC should have an UPS.
More in-depth about UPSes;
UPSes can output 3 different kinds of waveform:
1. square wave - cheapest of the three. ONLY good for robust hardware, like power generators and motors.
2. simulated sine wave (aka stepped-approximated sine wave) - mediocre price. Good for most home appliances (e.g fridge, washing machine, lights).
3. true/pure sine wave - high price. It is the same as you get out of the wall socket. ONLY waveform good for sensitive electronics, like medical equipment, TVs, PC PSUs.
So, you want to have true/pure sine wave UPS. Simulated sine wave UPS may also work, but it may not. More of that below;
When looking for an UPS, there are 2 things to look out:
1. Output waveform (square wave, simulated sine wave and true/pure sine wave)
2. Design (stand-by, line-interactive and online)
From here you can read about the differences between output waveform,
link:
https://suvastika.com/why-choose-a-sinewave-inverter-ups/
And here are explanations about the UPS design,
link:
https://www.eetimes.com/document.asp?doc_id=1272971
Waveform and design
For PCs, line-interactive UPS would be more than enough since PSUs can easily handle the 2ms to 5ms transfer time of line-interactive UPS.
As far as output waveform goes, true/pure sine wave UPS is best used. While simulated sine wave UPSes are cheaper than true/pure sine wave UPSes, PSUs with Active PFC aren't compatible with simulated sine wave. You might get simulated sine wave UPS running with Active PFC PSU but there can be some major issues. Here's what, how and why.
How do you know which PSUs have Active PFC and which ones don't?
Simple, every PSU that has 80+ certification (e.g 80+ Bronze or 80+ Gold) has Active PFC.
What is Active PFC?
Further reading:
https://en.wikipedia.org/wiki/Power_factor#Power_factor_correction_(PFC)_in_non-linear_loads
What can happen when using simulated sine wave UPS with Active PFC PSU?
When simulated sine wave UPS switches over to the battery power, one of 3 things can happen:
1. UPS displays error resulting PC to shut down immediately.
2. UPS shuts down resulting PC to shut down immediately.
3. UPS switches to battery power resulting PC to power off from UPS (PC stays on).
Why it happens?
Simulated sine wave UPS produces a zero output state during the phase change cycle resulting in a power “gap”. This gap may cause power interruption for active PFC PSUs when switching from AC power output to simulated sine wave output (battery mode).
What to do next?
As stated above, your PC can run off from simulated sine wave UPS but be prepared when you face issues with it. When issues do rise, your best bet would be returning the simulated sine wave UPS and getting true/pure sine wave UPS. Or you can go with true/pure sine wave UPS off the bat.
Wattage
As far as UPS wattage goes, you need to consider the power draw of your PC and monitors. Maybe speakers and wi-fi router too if you plan to plug those into the UPS as well. Though, printers, scanners and other such hardware (full list on your UPS manual) don't plug to the UPS since their startup power draw is way too much for UPS to handle and you can fry your UPS.
Taking PSU's max wattage as a baseline is good idea since it will give your UPS more headroom and you can get longer runtime out of your UPS. Since your PSU is 1000W, at least one monitor is added on top of it. As you said, your monitor uses 59W. Wi-fi routers don't consume much power. For example, my Cisco EPC3940L consumes 12V at 3A which means 36W.
Now, you don't have to get 1000W or 1100W UPS. Your build does fine with 800W or 900W UPS as well.
But the more powerful UPS you have, the longer UPS can keep your PC running before it's battery is empty.
A bit more about online (double- or delta-conversion) UPSes;
Online UPSes work on the principle that power is always taken directly from the battery (0 transfer time) and inverter is charging the battery at the same time. Now, if there is failure within the battery, it switches to the main power, directly from the wall. Online topology works vice-versa to the line-interactive topology.
Pros of online topology:
* 0 transfer time
* true/pure sine wave
* no downtime at all
Cons of online topology:
* battery will wear out fast
* only authorized service can replace batteries
Online topology is commonly used in server parks, where UPSes have multiple replaceable batteries. So, when one of the batteries dies, it is replaced without cutting the power to the servers at all. However, online UPSes doesn't have user replaceable batteries, only authorized service can replace their batteries, doing it on-site.
So, when you're home user, better to look towards line-interactive topology (e.g CyberPower New PFC Sinewave series i linked above), where you can power down your system and replace the battery when needed. It's also cheaper than online topology UPS.
But when you have a business, where PC downtime is not acceptable, online topology would suit better. But this means that to replace the battery, you have to order proper technician on-site, who then does the battery replacement (while the PC remains powered at all times).
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