105 Ah Battery Backup Unit | GBU-3U

gbu3u battery backup unit


  • 3RU High variant with 105Ah of capacity
  • 19-Inch Rack Mounting
  • Current Capacity: 100A
  • Operating Voltage: 48Vdc
  • Scalable, connect multiple units in Parallel
  • RS-485 Communication Ports


The Guardian Battery Unit GBU-3U is a 48V 19” rack-mountable Lithium-ion Battery Backup Unit (BBU) designed to be used in conjunction with the Aspiro and Guardian DC Power Systems. The GBU Series has been designed for data center and telecom applications as a replacement to Lead Acid batteries.

The patented Energy Balance Technology (EBT) provides internal balancing among the BBU modules connected in parallel. The EBT ensures consistent voltage and current delivery from the entire system of connected modules, which maximizes runtime and power delivery.

Remote management via the Modbus, over RS-485 or Ethernet via the Unipower GCC Controller with PowCom™ software provides immediate access to performance and alarm information.

Lithium Nickel Manganese Cobalt (NMC) chemistry provides the best energy density and the smallest footprint in the industry.


Electrical Parameters

Lithium-Ion ChemistryLithium Iron Phosphate
Nominal Voltage51.2V
Voltage Range42.7-54.8V
Nominal Capacity105Ah (5376Wh)
Continuous Discharge Current100A
Pulse Discharge Current115A for 300ms
Quiessentient Current DrawTBD
Maximum Input Voltage *58V
Min/Max Charge Current Range3-100A
Cell BalancingPassive, 300mA
Maximum in Parallel OperationContact Green Cubes

Physical Parameters

TerminalsFour threaded receptacles, M6 bolt pattern
Dimensions, case17.3" X 22" X 5.14", 440mm X 558.8mm X 130.5mm
Weight50kg (110 lbs)

Communications and Control

Serial CommunicationModBus over RS-485
Network CommunicationSNMP and CLI over Ethernet


Operating Humidity5% to 95% non-condensing
Charge Temperature Range0°C to +55°C
Discharge Temperature Range-20°C to +55°C
Thermal ManagementVariable Speed Fan
IP RatingIP 20

Approvals and Safety

Agency ApprovalsUN 38.3, UL 1973, IEC 62619
Radiated and Conducted EmissionEN55032 / CISPR 22 Class A
Calendar Life @ 80% SOC **20 Years
Cycle Life @ 80% SOC3500 Cycles
Battery ModesBattery modes - Ship and active
Shipping ClassificationClass 9
* Max voltage applied to terminal
** Fan is replacement part


gbu3u battery backup unit
ups solution white paper
White Paper (registration)