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[–] 4482898? [S] 0 points 1 point (+1|-0) ago 

When I bought my UPS I just aimed for the biggest that I could afford. My reasoning was that it could last longer on battery power. However as this video also shows, you also must take into account how much that power supply is able to provide continuously. That is about 40% less than the power on the UPS. e.g. 1200VA is technically equal to 1200W (DC), but the fact that it produces a sign wave it becomes 720W (AC) for real.