eFlex Data Sheet

eFlex 5.4 Lithium Battery Storage
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: 15 (81 kWh)
Depth of Discharge Up to 100%
Warranty 10 Years
Cycle Life 8,000 (@ 80% DoD)
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
Temperature Specifications
Discharge Temperature: -4°F~131°F (-20°C ~ 55°C)
Charge Temperature: 32°F ~ 114°F (0°C ~ 45°C)
Storage Temperature: 20°F ~ 95°F (-6°C ~ 35°C)
Mechanical Specifications
Dimensions: (L*W*H) 18x23x7.3 inches
446x546x183 mm
Weight: 108 lbs (49kg)
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 Automatic Prismatic - LiFeP04
Charge Specifications
Recommended Charge Current: <55A
Maximum Charge Current: 100A
Recommended Charge Voltage: 54.4V
BMS Charge Voltage Disconnect: >56V
Compliance Specifications:
Certifications: UL9540. 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
We design the eFlex 5.4 with a goal of building the world most
robust lithium battery for all different application scenarios and harish
weather conditions.
• Tier 1 Automotive Prismatic Lithium Iron Phosphate Cell with the high-
est cycle life
• Patented Enclosure design achieves 4 times better thermal perfor-
mance than our competitors
• IP 65 Dust and Water Proof design for outdoor install
• Flexible mounting options (wall mount, floor-stand or standard 19”
industrial server rack mount)
Our market leading Digital Processor Battery Management
System (BMS) includes:
• High amperage Contactor Disconnects
• Individual cell voltage & temperature monitoring and balancing for
maximum reliability and longevity
• Canbus, Modbus, and Wi-Fi communication enable Internet-of-Things
compatibility
• Advanced closed loop communication with most 48V inverters
www.FortressPower.com
[e-mail] • 877-497-6937
Compatible with Most
Inverters on the Market
Schneider Sol-Ark Midnite Solar OutBack Power SMA Morningstar Phocos Victron Energy Growatt
Application
Scenarios: