Power Shield UPS Knowledge Base

What size UPS do I need?

in FAQ

This all depends on the load of your system. There are two ways that you can compute your load:
Add the amps of all equipment intended to be backed up and multiple it by 220 to get a proper voltage amp or VA rating. The UPS rating must exceed the VA total.
Add the watts of all equipment intended to be backed up and divide it by 0.7 to get a true VA rating. Again the UPS VA rating must be greater than the comprised VA rating.