APC 1200va Power Backup UPS

Guys, if i use this UPS with TV , Router and 2 laptops how long will it last on power blackout. (assuming the average wattage of those devices)

Laptop-45w2=90w
TV-50W
Router-6W.
System losses-120W
Total=~270W
1hour=270wh.
Time taken to 0 =1200w/270wh=4 hours(theoretical)
Consider DoD~.6 means you don’t have that 1200va. It means you have 0.6*1200=720.
So, 720/270 around 2 hours, best case 3 hours.

UPS are designed to work at least 5mins, it’s only job is uninterruptible power supply by handling transition between Mains, generator and back.

thanks mkubwa

Hivi ndio watu huanguka mtihani

I am looking for your opinion…