Those run times are low. If all you've got connected to the battery side is the 630 at say 30W, then a 350 VA or 500 VA UPS should suffice. They can typically be found on sale for under $100. 750VA units are also typically quite inexpensive. Here's a calculator for determining the run time.If the DVR consumes 30W, then a 1000VA UPS will keep it going ~30mins, a 2000VA UPS will run for ~60mins etc.
Tell me why that wouldn't be at least 7-8 hours on standy with 500VA??The only way to know for sure would be to get a Watt Meter. Any single specs on the unit itself or in the manual would likely be "max" draw.
I would guess it's about 20-30 Watts in standby, therefore a 500 VA UPS should suffice, giving you a couple of hours. If you want more cushion, just buy a 750, which would give you almost 3 hours.
I bought a 700VA UPS specifically for the purpose of plugging my TV into it. This was because it was a rear-projection DLP TV. The TV had a fan to cool the bulb, that continued to run for about a minute after the TV was powered off. This was to prevent "heat soak" from damaging the bulb. If the power failed, this cooling fan wouldn't run, possibly lessening the life of the bulb. Since I only have my TV on when I'm present and watching, the UPS allowed me to turn off the TV during a persistent power failure and still have the cooling fan run for its normal duration.I always recommend that people don't plug their TVs or AVRs into the battery side of a UPS [...]
Correct. Run time is determined by the voltage and amp-hour rating of the battery. That is further reduced by UPS inefficiency and the power factor of the load. A typical consumer grade UPS battery provides between 7 and 25 amp-hours at 12v.Watts doesn't equal Watt-hours, which is the factor you're missing.