Lithium Iron Phosphate Battery eFlex 5.4 kWh

The Fortress Power Advantage


Flexible to Install

The compact and easy-to-install unit can be wall mounted or floor-standing. It also fits well into standard server racks for large systems

High Durability and Long-Lasting

10 Year Warranty with the safe and premium prismatic Lithium-Iron-Phosphate cells

Lowest Cost Per Cycle

High energy throughput with exceptional life span (6000+ cycles) and high round-trip efficiency (>99%)

Versatile Applications

Expandable from 5.4 kWh to 81 kWh for residential, commercial, railway, military, and telecommunication applications etc.

Monitor from Anywhere*

The battery has a built-in data storage Wi-Fi for remote monitoring and troubleshooting ability

*online monitoring up-and-running by late Q3

Waterproof and Saltwater Resistant

The sleek-looking Aluminum cabinet has IP 65 waterproof rating to prevent salt-water corrosion

eFLEX 5.4 kWh


 Total Energy (kWh)
 Max. Charge Current (Continuous) [A]
 Max. Discharge Current (Continuous) [A]
 Max. Pulse Current (for 5 sec) [A]
 Capacity [Ah]
 Voltage Range [V]
 Charging Temperature [F]
32 to 113
 Discharging Temperature [F]
32 to 140
 Storage Temperature [F]
32 to 95
 Dimension [L x W x H, inch]
21.5 x 17.5 x 7.2
 Weight [lbs]
 Life Cycles
6000 @ 80% DoD
 Round Trip Efficiency

Fortress batteries can be paired with most chargers and hybrid inverters available on the market.

99% Roundtrip Efficiency

High Durability and Long-Lasting

Safe Lithium Iron Phosphate Technology (LifeP04)

Remote Monitoring

Cell Level Monitoring & Balancing

Remote Monitoring

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