cr0n wrote: ↑
Fri Sep 07, 2018 12:16 pm
Okay, I see that you would entirely recommed UPSs.
Let's assume that I buy an UPS. What would you think, which flaws would cheaper UPS have compared to more expensive ones?
The most important determinant of price for UPSes is the capacity of the device in Watts (determined by the current which its inverter can supply from its batteries) and the total amount of energy which its batteries can store. These generally increase more or less in parallel with increasing price. A typical consumer UPS can maintain its rated power for 5-15 minutes before its batteries are exhausted - it will last correspondingly longer, of course, if supplying less than its rated power. The batteries are the most expensive component of the UPS. At a given 'power point', you may pay a bit more for 'bells and whistles', like built-in spike protection for ethernet, cable, or telephone lines, automatic clean shutdown of an attached computer in case of a mains power failure, and/or remote monitoring capabilities , but these are secondary.
If you buy a name brand UPS (APC, Tripp-lite), you should not have to worry about reliability or effectiveness of protection from transients in normal use. I would not personally buy a UPS built by a manufacturer whose name I did not recognize, but YMMV.
The 250W UPS I specified is the lowest power general UPS I know of - going below that, you are generally talking about devices that are designed to attach directly to single computers, and these are often more, rather than less, expensive, though they typically have many of the "bells and whistles" I referred to above.