calculate battery runtime

You posted the same question in Miscellaneous - you could have requested that it be moved here.

The run time can be calculated by looking at MikProg's answer (the accepted answer) here: https://www.experts-exchange.com/questions/21045370/Please-explain-UPS-Uninterruptible-Power-Supply-run-time-calculations.html

hehe  Ya, I thought adding it in two places might double my chances of getting an easy to follow answer.  So what exactly would I be looking for on the power supply?  MikProg says "Take a sum of numbers signed on  every power supplay in your servers".  Is he taking a sum of the watts?

For time calculations, use VA (watts = VA x 0.7), so add up the watts and convert to VA.  Look at the ampere-hour capacity on the UPS.  Divide rated VA of UPS by output voltage to get total current output, then divide the ampere-hour capacity by total current output to get runtime in hours (multiply by 60 to get minutes).

The important part is

"The parameters you really need is UPS VA and battary AH. Serious manufacturers are always publish them. The only thing you need is check if UPS maximum allowed current is less then possible consumption it is
  UPSmac A > (400+500+450+...)/0.7/220 A"

UPSmac should be UPSmax (maximum output current), and use 120 instead of 220 if the voltage is 120.