Approximate Battery Times - Eaton Powerware Prestige Series 1500 VA Installation And Operator's Manual

If the total load requirements of the equipment exceeds the capacity of
the UPS, you must either reduce the number of pieces of equipment, or
use a UPS with a larger load capacity.
When deciding on which pieces of equipment to remove from the UPS,
select equipment that has a lower priority for power protection.
Computers, monitors, and modems typically have a higher priority
because they could be processing or transmitting data when a power
outage occurs.

Approximate Battery Times

During a power failure, the UPS battery supplies power to your
equipment, providing time to complete computing activities prior to
UPS shutdown. The duration of this time period is directly related to the
UPS battery configuration. By adding battery cabinets (EXT models
only), you can customize the UPS to provide enough battery time for
normal processing activities.
Powerware ® Prestige Series Installation and Operator's Manual for IBM Applications (650 VA - 1500 VA) Uncontrolled Copy
3. Add all of the resultant VA ratings together to obtain the total
load requirements of the equipment to be protected (see
Figure 2). If the load consists of the power-factor corrected
supplies, it is recommended to use total watts for the load
requirements.
COMPUTER
100 WATTS
100 WATTS x 1.4 = 140 VA
140 VA + 240 VA + 50 VA = 430 VA (Total Load Requirements)
Figure 2. Volt-Amperes Calculation Example
MONITOR
2 AMPS
2 AMPERES x 120 = 240 VA
or 1 AMPERE x 240 = 240 VA
Introduction
EXTERNAL
MODEM
50 VA
50 VA
3