5. So I believe a 750VA UPS should be good enough?
My calculations get totally screwed if my system consumes more than 350W and this is what I want to confirm with you guys - to help me figure this out.
6. As the SMPS is APFC, I can play a game by buying a UPS without pure sinewave output - would save me a lot of bucks.
Otherwise, I can just buy myself some peace of mind by paying more than double for a pure sinewave UPS.
This is were choices become more difficult to make.
A 750VA APC costs ~$90 less than a 1KVA APC - both pure sinewave.
What you say - should I get the 750 or the 1k?
I am not sure however, whether APC has derated their UPS or is the VA rating a peak rating.
In case the 750VA is a peak rating - maybe I should, then, get the 1KVA?
It's not just getting a sufficient VA rating. The batteries wear out and a UPS with a higher rating will last longer. I don't have any hard numbers and it's likely a UPS with better quality batteries could last longer than a UPS with a higher VA but in general a higher VA will last longer.
Personally I'm not happy with the UPS situation. They are too expensive. I'd like a much smaller UPS that supplies just enough power to shut down my system without it crashing and I can't find one.
FYI, I bought a Belkin 1000VA 5 years ago for a system that probably didn't use much more than 150Watts peak and it lasted three years. I bought another one for my sister who had a less powerful machine and it lasted about 2.5 years. The batteries in many UPS's are no different so don't count on much more than 3 years.
Frankly, it seems darn stupid to me that motherboard manufacturers do not feed from a set of 12V Rails.
How much would a few regulators cost - compared to the cost of all the hoola hooping UPS and other backup methods?
Even if they had a 12V and 5V feed, it would be much more cheaper for people to hookup a battery to it and save on mighty UPS costs.
When on power - draw from the SMPS
When off mains power - draw from a 12V battery.
Would have saved $$ I tell ya.
Had it not been for this Active PFC stuff, I would have bought myself a cheap 1KVA UPS from my friend's owm company - the last 650VA unit I bought from him is still going strong since 2001, albeit a $20 battery replacement last year.