I am in need of a UPS system, but the seller says i must have a pure sine 1000VA UPS system that costs like 300$, i was wondering if i really need it because i read on the internet that the power supply waltage doesn't matter ?
at the store he told me that because of my PSU, i must have a pure sine UPS system of 1000VA,
thing is im not sure why i need such a costly UPS ..
why cant I do with a 700VA non-pure-sine UPS system ?
the price drop is like half, about 150$ !
I shouldn't matter what your power supply is but what power your computer draws (based on my intuition, correct me if I am wrong people). You can use a power supply calculator for a "ball park" figure. I find the numbers they give are on the high side, which is good, as it accounts for power spikes and what not. You can also buy a meter which measures the power real time.
As far as the pure sine wave necessity, I don't know. I'm assuming the link posted by Nikkor is not a pure sine wave (based on price), and he along with many others say it works. I am an electrical engineer but power is not my focus. I would say, it depends on how the power supply converts the voltage if you need a pure sine wave or not.