The basic rule of physics that "watts = volts x amps" is based on direct current (DC) circuits. AC is more efficient but when it hits the transformers, it suffers from reactance.
Reactance reduces the useful power (watts) available from the apparent power (volt-amperes). Power Factor (PF) is the ratio of these two numbers. Therefore, the actual power formula for AC circuits is "watts = volts x amps x power factor." Unfortunately, the PF is rarely stated but generally is a number of 1.0 or less, and about the only thing with a 1.0 PF is a light bulb.
Figure out total loading of product Amps (A) Watts (W).
Multiply voltage by amps (V x A).
VA x 135%= the size of the UPS you would need.
* Estimated Average Growing Space 135%
(Amps)
A. Ex: 1 PC= 2A 1 Monitor=1.5A, Total= 3.5A
3.5A x 120V= 420VA x 130%= 546VA.
B. Ex: 1 DVR = 300 Watts, 5 CCTV = 350 Watts, Total = 650 Watts
W = P.F. x VA, Direct UPS JP X series P.F = 0.7 & VP series = 0.6
650 W = 0.7 x VA , VA =650w/0.7, Total Loading = 929VA
Right size UPS: 929 VA x 135% = 1254VA.
The recommended size UPS for example a. is 600VA
The recommended size UPS for example b. is 1400VA
