GFS Power

DC Power System with DC-DC Converter

Centurion III Shelf with DC-DC Converter


Power -48, 24 and 12 Volt Site Equipment from One System.

  • 19″, 2U rack mount shelf with integrated power distribution
  • 90-250 VAC input, Power Factor Corrected
  • 2 power bays accept 1000 or 2000 watt modular rectifiers
    • 74 amp, 4000 watt total max. output capacity, (37 Amp, 2000 Watt, N+1) @ – 48 VDC
  • 2 power bays accept DC-DC modules
    • -48V to 12V and -48V to 24V
  • Output temperature compensated for precise battery charging
  • -48VDC circuit breaker distribution capacity with tripped breaker alarm
  • 10 DC circuit breaker distribution capacity, with tripped breaker alarm
  • 1 each DC-DC converter output circuit breaker distribution with tripped breaker alarm
  • Master disconnect breakers for two 48 volt battery banks, with tripped breaker alarm
  • Controller with digital display of up to three system DC system parameters with TCP/IP interface and SNMP monitoring/logging
  • Alarm contacts monitor major system functions
  • Low voltage disconnect built in
  • Easily configures to meet site power requirements

48V Rectifier Configurations

Watts Per Rectifier # of Rectifiers Installed
1 2
2000 18A (1000W) 36A (2000W)
1000 37A (2000W) 74A (4000W)
DC Converter Configurations
Voltage Conversion 1 2
48 to 24V 560W 1120W
48 to12V 560W 1120W

Preliminary specifications subject to change without notice.

AC Input

Nominal: 230V
Voltage Range: 90-300V (derate @ 115 input)
Frequency Range: 45-65 Hz
Power Factor: >0.99
Efficiency: >94% (from 30-95% output power)

DC Output

Voltage: -48 volt, constant power
Output Ratings: 48V to 58V
Nominal Voltage: 48V
Rated Voltage: 58V


Rated maximum System Output Power: 4000W @ -48V
Polarity: Positive Earth

Individual Rectifier Power: 1000 watt 2000 watt
Amperage @ 230 vac in 7 12
Amperage @ 115 vac in* 12 13
* 1kW derated to 650W @ 115VAC, 2kW derated to 1300W @ 115VAC

DC Distribution

Load: Up to 12 load circuit breakers (6 – 63A)
Battery: Up to 2 battery circuit breakers (max. 100A)

Monitoring and Control

Display: Multi-lingual alpha numeric backlit display


Serial: 1x USB port on front panel for local PC interface
TCP/IP: Ethernet interface for communication using SNMP protocol and internal web based configurator (optional)
HTTPS capable
Modbus: Supported via TCP/IP

LED Indicators:

  • Green: Power on/monitor OK
  • Yellow: Non urgent alarm
  • Red: Urgent alarm

Audible: 90dBA buzzer mappable to user defined conditions

Controls: 3x push buttons for parameter setting or viewing on front panel

Signal Inputs:
Serial bus for rectifier control and interface to peripheral modules
6x spare general purpose inputs (analogue/digital)
2x temperature sensors (one fitted)

Relays: 3x alarm and control relays, two of which can be mapped for customized alarm settings (expandable)

Alarm Contacts:
Volt Free Contacts: 0.3A @ 100V (0.15A @ 160V)

Logging Capacity:
Periodic Log: Up to 16,384 records (dependant on number of parameters logged)
Event Log: Up to 16,384 records (dependant on number of parameters logged)

Relay Outputs: Mini combicon to accept 1.5mm wire
USB Port: USB mini B


Ambient Temperature:Nominal: 25+/-5º C
Range: -10º C to +70º C (maximum output power is derated above +50º C)
Humidity: 5-95% RH (non-condensing)
Altitude: <8,202 ft., De-rate maximum ambient temperature by 4º C per 3,280 ft. above sea level


Shelf Dimensions: 19” W x 3.5” H x 15.35” D
Weight: 19.84 Lbs. (excluding rectifier modules)
Rectifers Dimensions: 4.25” W x 2.75” W x 11.1” D
Weight: 3.15 Lbs
Cooling: Forced cooled


Safety: EN60950
Electrostatic Discharge: CISPR24
Radiated Radio Frequency: CISPR22
AC Harmonics: EN61000-3-2
AC Flicker and Fluctuation: EN61000-3-3
Other: CE & RoHS compliant

DC-DC Converter

DC Input

CIII4824     CIII4812
Nominal Input Voltage: 48V DC     48V DC DC
Input Voltage Range: 40-60V DC     40-60V DC


Fuses: Fuse in the positive input with crowbar diode
Input Voltage: Auto shutdown, auto restart when correct voltage restored

DC Output

CIII4824       CIII4812
Nominal Output Voltage: 24V DC      12V DC
Output Voltage Range: 22-26V DC    11-14V DC
Maximum Output Current: 25.0A    40.0A
Maximum Output Power: 650W    560W
Peak Efficiency: 93.0%    90.0%

© GFS Power. Website by Mick's Design.