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Fortress Power eFlex 5.4 EFLEX-5.4KW 5.4kWh 105Ah 48VDC Lithium Iron Phosphate (LiFeP04) Battery

Fortress Power eFLEX 5.4 EFLEX-5.4KW 5.4kWh 105Ah 48VDC Lithium Iron Phosphate (LiFeP04) Battery

Our Price: $3,120.00

Product Code: EFLEX-5.4KW

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Description Document(s)

Fortress Power eFLEX 5.4 EFLEX-5.4KW 5.4kWh 105Ah 48VDC Lithium Iron Phosphate (LiFeP04) Battery

Manufacturer Part#: EFLEX-5.4KW

The Fortress Power eFlex is a 5.4kWh scalable energy storage solution based on safe and energy dense prismatic Lithium Iron Phosphate cells. The digital processor Battery Management System (BMS) includes high amperage contactor disconnects and advanced Closed-Loop inverter communication, as well as individual cell voltage monitoring, temperature monitoring, and cell balancing to maximize reliability and longevity.

Canbus, modbus, and wifi communication enable internet-of-things compatibility. The IP65 case ensures direct water spray and dust will not penetrate the battery internals from all directions. The unit can be wall mounted, floor mounted, and server rack mounted for hard-to-reach access in renewable, marine, RV, mobile, telecom, railway applications and more.

  • Rugged, long-lasting, daily use battery
  • Safe Lithium Iron Phosphate technology (LifeP04)
  • 98% round trip efficiency
  • Flexible mounting options
  • Remote monitoring including Wi-Fi, modbus, and canbus
  • BMS monitors & balances individual cells
  • NRTL certified to UL9540 and UL9540a standards

Full data sheet can be found in the Document(s) tab above.

Electrical Specifications
Nominal Voltage 51.2V
Nominal Capacity 105Ah
Rated Capacity @ 0.5C (50A) 5.374 kWh
Resistance <10 mΩ
Efficiency (at 0.5C) >98%
Self-Discharge <1 % / Month
Maximum Allowed Modules in Parallel 30 (162kWh)
Depth of Discharge Up to 100%
Warranty 10 Years
Cycle Life 8,000 (@ 80% DoD)
Charge Specifications
Recommended Charge Current <55A
Maximum Charge Current 100A
Recommended Charge Voltage 54.4V
BMS Charge Voltage Disconnect >56V
Nominal AC Frequency 50Hz / 60Hz
Discharge Specifications
Recommended Continuous Discharge Rate 60A (3KW DC)
Peak Continuous Discharge Rate 100A (5 KW 60 Min)
Maximum Surge Power Rate 130A (6.6 KW 5S)
Recommended Low Voltage Disconnect 48V
Battery Low Voltage Protection <45V
Battery recovery Voltage 45V
Fault Current 3000A, 5ms
Mechanical Specifications
(L x W x H)
18 x 23 x 7.3 in
446 x 546 x 183 mm
Weight 108 lbs | 49 kg
Terminal Type M8
Ring Terminal Size 3/8ths or larger
Terminal Torque 7.0 – 7.7 Nm
(5.1 – 5.7 ft-lb)
Terminal Cover 1 set, Waterproof
Case Material Anodized Aluminum
Enclosure Protection IP65
Cell Type Chemistry Tier 1 Automotive Prismatic - LiFePO 4
Compliance Specifications
Certifications UL9540, UL9540A. UL1973, UL1642, CEC, SGIP
Shipping Classification UN 38.3, CLASS 9
(Lithium Ion Battery)
Basic Charging Profile
Bulk + Absorb Charge 54.4V
Absorb Time 60 minutes
Float Charge 54V
Inverter Charging 2 Stage / No Float
Equalization No equalization (typical)
54.6V for 10 seconds (rare)
Temperature Compensation None

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