Dell H914N, K789N Configuration, Voltage, Fuses, Type, Charging, Monitoring, Battery Runtimes

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, 1920W EBMs: (4) 30A fuses
	1000W, 1920/1500W internal batteries:
	(2) 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.

Input Filter

AVR

Output

Filter

Charger

Battery

DC/DC

Converter

DC/AC Inverter

Figure 27. Line-Interactive UPS Block Diagram

58 Specifications