What size UPS do I need to last 30 minutes?

[Anonymous user]

I am trying to find out what size UPS I need for my workplace. It is a construction site and power outages are quite frequent. I am running two Veriton L640 PC's, with one LG T1710 BP touch screen, one Acer G235H monitor, one D-Link DIR-412 router and one TP-Link TL-SG1008D gigabit switch. If I have calculated correctly all this equipment is rated to use 483VA. Power outages last between 5-30 minutes and the equipment needs to stay on the whole time. I have tried figuring out what size UPS I need, but only got as far as calculating power usage before finding it too confusing.
Any tips/suggestions would be greatly appreciated.

[BillP · Accepted solution]

We usually size customers up based on wattage, not VA, however I would recommend the below two units. This is based on 485 watts. The first will give you between 25 - 30 mins. The second will give you around 60 mins. Unfortunately, there's really no middle ground. Va measurements are usually worst case scenario and aren't the same as watts so you may get more than runtime the estimates as your equipment will not run at full power all the time. In my opinion, the first option should be sufficient. Anything smaller(such as our back ups line) would only give you 10 mins or so runtime at best so these two options below are your best options.

http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=SMT1500&total_watts=50
http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=SMT2200&total_watts=50