I don't know about Thailand municipal power systems, but I'm going to guess that they can't be relied upon to deliver high quality power 24/7/365 like what you might see in leading western civilization cities. IMO typically the main reason some UPS are significantly more expensive than others is their support for brownout conditions. but most of the information I've seen on such is in Thai language, I have not read of any GNU/Linux support, and price wise it is no cheaper than CyberPower brand froom what I can tell. In Thailand I note a locally produced UPS is the Chuphotic brand. There is at least one Youtube video tutorial explaining how to configure a GNU/Linux system using the CyberPower GNU/Linux support package. I note CyberPower support GNU/Linux and they have an RPM one can download and install. So based on that, obviously a 'USB' interface from UPS to PC is essential. My goal is to have an openSUSE shutdown within a few minutes of any power outage - even when UPS battery is 3 to 4 years old. I often have a couple of external hard drives attached when using the desktop, so I figure it is better to 'err' on the slightly higher side wrt UPS capacity. My desktop has a Core-i7 and I use a 27' monitor. I'm currently considering a CyberPower UPS UT1500E-AS,1500VA/900WATT which I can purchase in Thailand (by mail order) from an electronics parts supplier for a reasonable price. I've read threads on this forum raving about APC UPS, but unfortunately those are priced rather high compared, for example, to the CyberPower. I have already had a couple of unexpected power outages in the short time my desktop has been up and running, so I figure I should consider a UPS. I recently moved here earlier this year, and earlier this month I finally got around to unpacking my desktop computer. I am considering the purchase of a UPS for my desktop PC, here in Thailand.

Cyberpower usb ups