Dell UPS 1920T - Manual (Page 58)

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Specifications
Table 15. Battery
Configuration 500W: (2) 12V, 7 Ah internal batteries (no EBM)
1000W: (3) 12V, 9 Ah internal batteries; (6) 12V, 9 Ah EBM
1920/1500W: (6) 12V, 9 Ah internal batteries; (12) 12V, 9 Ah EBM
Voltage 500W: 24 Vdc internal
1000W: 36 Vdc internal, 36 Vdc EBM
1920/1500W: 72 Vdc internal, 72 Vdc EBM
Fuses 500W internal battery: (2) 40A fuses
1000W, 1920/1500W internal batteries:
(2) 30A fuses
1000W, 1920W EBMs: (4) 30A fuses
Type Sealed, maintenance‐free, valve‐regulated, lead‐acid
Charging Internal batteries: approximately 4 hours to 90% (8 hours for 500W models) usable
capacity at nominal line and no supplementary power supply load
EBMs: approximately 12 hours to 90% from a discharge of 50% rated load
Monitoring Advanced monitoring for earlier failure detection and warning
Battery Runtimes Internal batteries: 5 minutes at full load/14 minutes at half load
UPS with one EBM attached: 19 minutes at full load/45 minutes at half load
*Battery runtimes are approximate and vary depending on the load configuration and battery charge.
DC/DC
Converter
Input
Filter
AVR
Output
Filter
Charger
Battery
DC/AC
Inverter
Figure 27. Line-Interactive UPS Block Diagram