To do so, you must take into account the intended total load (the combined voltage and amperage of all connected devices), the capacity (the unit''s maximum power output), and the amount of backup time desired from the UPS batteries (how long the UPS can support the equipment during a power outage).
Calculate the estimated run time of your UPS using the device load (in watts), power factor, number of batteries, battery voltage, and battery amp hours.
Find the perfect UPS system in two easy steps! Calculate the total power consumption of connected devices then choose a runtime so get your recommendations.
Once you have worked out the maximum wattage of your load (the PC, possibly + display), you can choose the base VA rating of UPS you need - then you look at the specs and see which model suits your need.
Runtime Calculator. This convenient calculator gives you the estimated runtime for any of our UPS models, showing you the total load in watts and the runtime in minutes. You may also use the Select Number of Battery Modules drop-down menu to find runtime information.
Need to learn more before making a decision? How Much Power Will Your UPS Use? Choose the right UPS, uninterruptible power supply, based on your total power consumption, Eaton UPS Selector.
The APC UPS Upgrade Selector helps you find and compare upgrade options and battery replacement solutions for both In-Warranty and Out-of-Warranty UPS products.
16 min (990 Watts) APC Smart-UPS Runtime Chart for SUA Models.
APC displays run time graphs on the product page for each model UPS. If the product page does not display such a graph, click on the hyperlink next to "Extended Run Options" on the product page of your unit to calculate the run time based on your current load in watts and number of battery packs added.
Select the right UPS for your home, home office, small business, Server Room and Network Closet, or Data Center Facility.