Originally Posted by Socio
So for a projector that is 330 watts something like this CyberPower CP850PFCLCD
which is 850VA
/ 510W Pure Sine Wave
UPS would be more than suitable, correct
The main cost of a higher power UPS is not so much the buying price (the difference between a 500VA and a 1000VA is not that great), but the maintenance cost of a larger UPS will be higher : with twice the power, any UPS will need Pb batteries with twice the Axh rating, batteries which will have to be replaced every 4-5 years.
And even if you try to be clever and buy "naked" Yuasa batteries from eBay instead of the UPS supplier (usually selling them twice as expensive), after the second battery replacement, you will have paid your UPS a second time.
But that's the price to pay to avoid the price of a much more costly replacement of all your audio/video/computer hardware...
To give a single example, after a power outage, the lamp of my Sony VPL-VW100 would not ignite anymore : a $400 replacement cost, about 2 times the cost of a proper UPS...