infiniteloop wroteWeird, every brand gives Watt equivalent in a different way, I saw some brands saying 1500va = 900w and other 720w
could it be that the 720w ones are not true 1500va?
They are all in-line interactive UPS with low power factor ( efficiency). A 1500VA one giving 900w has a PF of 900/1500 = 0.6 or 60% efficiency. These are the listed marketing specifications too , expect a lower PF of 0.45 - 0.5 range in actual usage. The best alternative , but much more expensive, is to purcahse an online pure sine wave UPS. They usually have a PF of at least 0.8 and give pure not simulated output. A high initial investment, but an excellent ROI for the long run.
