• An Unbound Renewable Energy Company
  • Open Mon-Fri: 6am to 6pm, and Sat: 8am to 5pm PST
  • About Us
  • Support
  • Blog
  • Installer Login
AI Terms
    Categories
      Brands
        Articles
          See more
          Products
            See more
            1-800-472-1142
            Get Quote
            (0 items)
            • Solar 101
            • Free Guides
            • Project Calculators
            • Videos
            • Commercial
            • Builders
            • Installers
            • All Solutions
                • ALL SOLUTIONS
                • Complete Systems
                  • Grid-Tie Systems
                  • Off-Grid Systems
                  • RV & Marine Systems
                  • Remote Telecom Systems
                • Solar Panels
                  • Monocrystalline
                  • Mono PERC
                  • Polycrystalline
                  • Flexible
                  • Shop All Solar Panels
                • Commercial Applications
                  • Home Builders
                  • Solar Installers
                  • Commercial Owner
                  • Industrial Off Grid
                • Inverters & Electrical
                  • Inverters
                  • Charge Controllers
                  • Power Centers
                  • Generators
                  • Breakers, Fuses & Panels
                  • Surge Suppressors
                  • Combiner Boxes
                  • Labels
                  • Wind Turbines
                  • Cable
                  • Disconnect Switches
                  • Busbars
                  • Rapid Shutdowns
                • Batteries & Backup
                  • Batteries
                  • Battery Banks
                  • AC & DC Coupled Backup Systems
                  • Battery Chargers
                  • Battery Enclosures
                  • Battery Monitors
                  • Battery Cable
                • Racking & Mounts
                  • Roof Attachments
                  • Racking
                  • Hardware
                • Shop All Brands
                • Shop All Products
                • Deals & Specials
                • Tools & Services
                  • Solar Cost Calculator
                  • Off Grid Calculator
                  • Battery Bank Calculator
                  • California Solar Mandate Calculator
                  • Solar Permitting
                • Free Guides
                  • Getting Started Guide
                  • Federal Tax Credit Guide
                  • Solar Permitting Guide
                  • Inverter Guide
                  • Battery Guide
                  • Racking Guide
                  • Solar Panel Guide
                • Learning Center
                  • Solar 101: Start Here
                  • Solar Resource Center
                  • Solar Blog
                  • Guide to DIY Solar
                  • Getting Started with Solar
            • Complete Systems
                • COMPLETE SYSTEMS
                • Grid-Tie Systems
                  • Micro-Inverter Systems
                  • Battery Backup Systems
                  • Optimizer Systems
                  • String Inverter Systems
                  • Commercial Systems
                • Off-Grid Systems
                  • 12 Volt Systems
                  • 24 Volt Systems
                  • 48 Volt Systems
                • RV & Marine Systems
                • Remote Telecom Systems
                • Tools & Services
                  • Solar Cost Calculator
                  • Off Grid Calculator
                  • Battery Bank Calculator
                  • California Solar Mandate Calculator
                  • Solar Permitting
                • Free Guides
                  • Getting Started Guide
                  • Federal Tax Credit Guide
                  • Solar Permitting Guide
                  • Inverter Guide
                  • Battery Guide
                  • Racking Guide
                  • Solar Panel Guide
                • Learning Center
                  • Solar 101: Start Here
                  • Solar Resource Center
                  • Solar Blog
                  • Guide to DIY Solar
                  • Getting Started with Solar
                  • Federal Solar Tax Credit
                  • Return on Solar Investment
                  • How Many Solar Panels Do I Need?
                  • Solar Panel Efficiency
                  • US Sun Hours Map
                • Featured Product
                  • Unbound Solar
                    9.45 kW 30-Panel Canadian Solar Off-Grid Solar System 1

                    9.45 kW 30-Panel Canadian Solar Off-Grid Solar System

                    SKU: 1890835
                    $20,027.50
            • Grid-Tie Solar
                • GRID-TIE SOLAR
                  • Micro-Inverter Systems
                  • Battery Backup Systems
                  • Optimizer Systems
                  • String Inverter Systems
                  • Commercial Systems
                  • Shop All Grid Tie
                • Tools & Services
                  • Solar Cost Calculator
                  • Off Grid Calculator
                  • Battery Bank Calculator
                  • California Solar Mandate Calculator
                  • Solar Permitting
                • Free Guides
                  • Getting Started Guide
                  • Federal Tax Credit Guide
                  • Solar Permitting Guide
                  • Inverter Guide
                  • Battery Guide
                  • Racking Guide
                  • Solar Panel Guide
                • Learning Center
                  • Solar 101: Start Here
                  • Solar Resource Center
                  • Solar Blog
                  • Guide to DIY Solar
                  • Getting Started with Solar
                  • Federal Solar Tax Credit
                  • Return on Solar Investment
                  • How Many Solar Panels Do I Need?
                  • Solar Panel Efficiency
                  • US Sun Hours Map
                • Featured Product
                  • Unbound Solar
                    8.76 kW Grid Tied Solar System with SolarEdge and 24 Astronergy Solar 365 watt Panels 1

                    8.76 kW Grid Tied Solar System with SolarEdge and 24 Astronergy Solar 365 watt Panels

                    SKU: 1890914
                    $12,406.00
            • Off Grid Solar
                • OFF-GRID SOLAR
                  • 12 Volt Systems
                  • 24 Volt Systems
                  • 48 Volt Systems
                  • Shop All Off Grid
                • Tools & Services
                  • Solar Cost Calculator
                  • Off Grid Calculator
                  • Battery Bank Calculator
                  • California Solar Mandate Calculator
                  • Solar Permitting
                • Free Guides
                  • Getting Started Guide
                  • Federal Tax Credit Guide
                  • Solar Permitting Guide
                  • Inverter Guide
                  • Battery Guide
                  • Racking Guide
                  • Solar Panel Guide
                • Learning Center
                  • Solar 101: Start Here
                  • Solar Resource Center
                  • Solar Blog
                  • Guide to DIY Solar
                  • Getting Started with Solar
                  • Federal Solar Tax Credit
                  • Return on Solar Investment
                  • How Many Solar Panels Do I Need?
                  • Solar Panel Efficiency
                  • US Sun Hours Map
                • Featured Product
                  • Unbound Solar
                    11.34 kW 36-Panel Canadian Solar Off-Grid Solar System 1

                    11.34 kW 36-Panel Canadian Solar Off-Grid Solar System

                    SKU: 1890836
                    $21,931.50
            • Solar Panels
                • SOLAR PANELS
                  • Monocrystalline
                  • Mono PERC
                  • Polycrystalline
                  • Flexible
                  • Shop All Solar Panels
                • Tools & Services
                  • Solar Cost Calculator
                  • Off Grid Calculator
                  • Battery Bank Calculator
                  • California Solar Mandate Calculator
                  • Solar Permitting
                • Free Guides
                  • Getting Started Guide
                  • Federal Tax Credit Guide
                  • Solar Permitting Guide
                  • Inverter Guide
                  • Battery Guide
                  • Racking Guide
                  • Solar Panel Guide
                • Learning Center
                  • Solar 101: Start Here
                  • Solar Resource Center
                  • Solar Blog
                  • Guide to DIY Solar
                  • Getting Started with Solar
                  • Federal Solar Tax Credit
                  • Return on Solar Investment
                  • How Many Solar Panels Do I Need?
                  • Solar Panel Efficiency
                  • US Sun Hours Map
                • Featured Product
                  • Heliene
                    Heliene 385 Black Mono Solar Panel 1

                    Heliene 385 Black Mono Solar Panel

                    SKU: 9434371
                    $325.00
            • Inverters & Electrical
                • INVERTERS & ELECTRICAL
                • Inverters
                  • Power Optimizers
                  • Remotes
                  • Monitoring
                  • Grid Tie Inverters
                  • Off Grid Inverters
                  • Hybrid Inverters
                  • 230V 50Hz Inverters
                  • Mobile Inverters
                  • Accessories
                • Charge Controllers
                  • Maximum Power Point Tracking
                  • Pulse Width Modulation
                  • Accessories
                • Power Centers
                  • 12 Volts
                  • 24 Volts
                  • 48 Volts
                  • PV Center
                • Generators
                  • Generator Packages
                  • Accessories
                • Breakers, Fuses & Panels
                  • Breakers
                  • Breaker Panels
                  • Breaker Boxes
                  • Fuses
                  • Backplate
                • Surge Suppressors
                • Combiner Boxes
                • Labels
                • Wind Turbines
                • Cable
                  • Solar PV Wire
                  • Connector
                  • Battery Cable
                • Disconnect Switches
                  • Accessories
                • Busbars
                • Rapid Shutdowns
                • Tools & Services
                  • Solar Cost Calculator
                  • Off Grid Calculator
                  • Battery Bank Calculator
                  • California Solar Mandate Calculator
                  • Solar Permitting
                • Free Guides
                  • Getting Started Guide
                  • Federal Tax Credit Guide
                  • Solar Permitting Guide
                  • Inverter Guide
                  • Battery Guide
                  • Racking Guide
                  • Solar Panel Guide
                • Learning Center
                  • Solar 101: Start Here
                  • Solar Resource Center
                  • Solar Blog
                  • Guide to DIY Solar
                  • Getting Started with Solar
            • Batteries & Backup
                • BATTERY & BACKUP
                • Batteries
                  • Flooded Lead Acid
                  • Accessories
                  • Lithium Ferro Phosphate
                  • Sealed Lead Acid
                • Battery Banks
                  • Flooded Lead Acid
                  • Lithium Ferro Phosphate
                  • Lithium-Ion
                  • Sealed Lead Acid
                • AC & DC Coupled Backup Systems
                • Battery Chargers
                • Battery Enclosures
                • Battery Monitors
                • Battery Cable
                • Tools & Services
                  • Solar Cost Calculator
                  • Off Grid Calculator
                  • Battery Bank Calculator
                  • California Solar Mandate Calculator
                  • Solar Permitting
                • Free Guides
                  • Getting Started Guide
                  • Federal Tax Credit Guide
                  • Solar Permitting Guide
                  • Inverter Guide
                  • Battery Guide
                  • Racking Guide
                  • Solar Panel Guide
                • Learning Center
                  • Solar 101: Start Here
                  • Solar Resource Center
                  • Solar Blog
                  • Guide to DIY Solar
                  • Getting Started with Solar
                  • Lead Acid Battery Comparison
                  • Deep Cycle Battery Info
                  • Lead Acid vs Lithium Batteries
                • Featured Product
                  • Discover Battery
                    Discover Battery AES 7.4kWhr / 48VDC with Xanbus Lithium (LFP) Battery 1

                    Discover Battery AES 7.4kWhr / 48VDC with Xanbus Lithium (LFP) Battery

                    SKU: 9979990
                    $6,479.00
            • Racking & Mounts
                • RACKING & MOUNTS
                • Roof Attachments
                  • Flashing
                  • Clamps
                • Racking
                  • Pole Mount
                  • Rails
                  • Ballasted
                  • Ground Mount Systems
                  • Roof Mount Systems
                • Hardware
                • Tools & Services
                  • Solar Cost Calculator
                  • Off Grid Calculator
                  • Battery Bank Calculator
                  • California Solar Mandate Calculator
                  • Solar Permitting
                • Free Guides
                  • Getting Started Guide
                  • Federal Tax Credit Guide
                  • Solar Permitting Guide
                  • Inverter Guide
                  • Battery Guide
                  • Racking Guide
                  • Solar Panel Guide
                • Learning Center
                  • Solar 101: Start Here
                  • Solar Resource Center
                  • Solar Blog
                  • Guide to DIY Solar
                  • Getting Started with Solar
                  • Racking and Mount Info
                • Featured Product
                  • IronRidge
                    IronRidge XR1000 Roof Mount Racking Kit Racking 1

                    IronRidge XR1000 Roof Mount Racking Kit

                    SKU: 6913220
                    $70.00

            Due to winter weather conditions & COVID-19, delivery times may be delayed.

            X
            New Exclusive Videos only on YouTube!
            Subscribe Now
            1. Home›
            2. Batteries & Backup›
            3. Batteries›
            4. Lithium Ferro Phosphate›
            5. Fortress Power eFlex 5.4 kWh Lithium Ferro Phosphate (LFP) Battery
            None eFlex 5.4 kWh Lithium Ferro Phosphate (LFP) Battery Battery 1
            Fortress Power

            Fortress Power eFlex 5.4 kWh Lithium Ferro Phosphate (LFP) Battery

            Fortress Power eFlex 5.4 kWh LFP Battery, 51.2V (48V) 105 Ah

            $3,850.00

            Qty
            SKU: 9989910 Batteries, Batteries & Backup, Lithium Ferro Phosphate Brand: Fortress Power
            • Description
            • Features & Attributes
            • Documents

            Description

            Fortress Power announces the eFlex 5.4 kWh scalable energy storage battery solution. The unit uses safe and high energy density prismatic Lithium-Iron-Phosphate cells. The battery has a built-in data storage and Wi-Fi for remote monitoring and troubleshooting ability. The smart relay-based Battery Management System (BMS), supports closed-loop communication with various 48V hybrid inverters on the market. Additionally, the BMS monitors and balances the voltage and temperature of each individual cell to maximize reliability and longevity. It has the highest round trip efficiency in the industry at 98%. This unit has wall mounting functionality and fits well into standard server racks for large systems.

            Additional Features

            • 98% Roundtrip efficiency
            • High durability & long lasting
            • Safe Lithium Iron Phosphate technology (LiFePO4)
            • Remote Monitoring
            • Cell level monitoring & Balancing
            • Close-loop communication with many hybrid inverters

            Features & Attributes

            Weight123.0 lbs
            Dimensions21.5 × 17.5 × 7.2 in
            MPN

            EFLEX 5.4

            Battery Amp Hours (Ah)

            105

            Battery Type

            LFP (Lithium Ferro Phosphate)

            Battery Voltage (DC)

            51.2

            Battery Warranty

            10 Years

            Documents

            Relevant Product Documents.

            Fortress Power eFlex 5.4 kWh Lithium Ferro Phosphate (LFP) Battery Specifications PDF
            Fortress Power eFlex 5.4 kWh Lithium Ferro Phosphate (LFP) Battery Warranty PDF
            Fortress Power eFlex 5.4 kWh Lithium Ferro Phosphate (LFP) Battery Installation PDF
            solar battery guide
            Download Our Solar Battery Guide
            A poorly designed system can ruin your batteries. Our Solar Battery Guide will help you size your battery bank properly and keep things running smoothly.
            Get free guide »
              • Shop
              • Grid-Tie Solar
              • Off Grid Solar
              • Complete Systems
              • Solar Panels
              • Electrical
              • Batteries & Backup
              • Hardware & Racking
              • Commercial
              • Learn
              • Solar 101: Start Here
              • Solar Resource Center
              • Solar Blog
              • Guide to DIY Solar
              • Getting Started with Solar
              • Tools
              • Solar Cost Calculator
              • Off Grid Calculator
              • Battery Bank Calculator
              • California Solar Mandate Calculator
              • Solar Permitting
              • Community
              • Blog
              • Install of the Month
              • Customer Testimonials
              • Ratings & Reviews
              • Referral Program
              • Company
              • About Us
              • Contact Us
              • Careers
              • Newsroom
              • Support
              • Support Hub
              • Terms & Conditions
              • Shipping Policy
              • Flat Rate Shipping
              • Returns
              • Freight Delivery Tips
            © 2021 Unbound Solar. All Rights Reserved.
            • Terms of Use
            • Privacy Policy
            Unbound Solar Facebook Page
            Unbound Solar Twitter Feed
            Unbound Solar YouTube Channel
            Unbound Solar Linked In Page
            Unbound Solar Instagram Feed