Advice on Battery Backup
Hello. I'm trying to figure out how to select a battery backup option for my computer. Lately, we've been having loads of power trips where my computer ends up restarting or shutting off.
I do have a Kill-A-Watt meter, and found that my computer uses about 200W at idle, and 550W with graphics cards under load.
So how do I go about selecting a proper battery backup? What I mean, is there a way to calculate with real numbers how long a certain VA and W rated battery backup will last? Say I purchase a 1500VA 900W battery backup, how do I calculate how long my system will run for say at idle?
I'm sure I have loads to read on understanding how Watts and VA relate to actual computer uptime, but if anybody can help guide me in the right direction, I'd be most appreciative. Thanks!
ps - I have read some wikipedia articles, but my physics is very rusty and I find myself going deeper and deeper, rather than making any practical sense of the information. After searching Google relatively extensively, I decided to come here to ask for guidance.