74 Chapter 11 Specifications
Liebert APM 90 Integrated Modular UPS User Manual
1. Factory set to 380V. 400V or 415V can be selected by commissioning engineer through software.
2. Factory set to 50Hz. 60Hz can be selected by commissioning engineer through software.
11.8
Efficiency, Heat Losses And Air Exchange
Table 11-8
Efficiency, heat losses and air exchange
Rated power (kW)
Item
Unit
18
36
54
72
90
Overall efficiency
Normal mode (double conversion)
%
94
ECO mode
%
98
Inverter efficiency (DC/AC) (battery at nominal voltage 432Vdc and full-rated linear load)
Battery mode
%
94
Heat losses and air exchange
Normal mode
kW
1.1
2.2 3.2 4.3 5.4
ECO
mode
kW
0.36 0.72 1.08 1.4 1.76
No load
kW
0.3
0.6 0.9 1.2 1.5
Maximum forced air cooling (front intake, back
exhaust)
L/s
64 128 192 256 320
Above condition applicable to voltage input and output range set at 400V and battery remains fully charged.