Fortress Power eFlex 5.4kWh Battery
$3,788.00
Sale price
$3,788.00
Regular price
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Fortress Power eFlex 5.4kWh Battery
$3,788.00
Sale price
$3,788.00
Regular price
The Fortress Power eFlex 5.4 is a 48V LFP battery module purpose-built for residential solar storage. The eFlex architecture is modular — additional 5.4 kWh units stack together to build larger battery banks as storage needs grow, making it a flexible long-term investment for homeowners.
Specifications
| Model | eFlex 5.4 |
| Usable Capacity | 5.12 kWh |
| Chemistry | Lithium Iron Phosphate (LFP) |
| Voltage | 48V nominal |
| Max Continuous Discharge | 100A (4.8 kW) |
| Cycle Life | 6,000 cycles to 80% DoD |
| Warranty | 10 years |
Key Features
- Modular 48V architecture — stack up to 4 units for 20+ kWh of storage
- 6,000 cycle life — exceptional longevity for residential applications
- Integrated BMS with CAN bus communication for inverter integration
- Compatible with Sol-Ark, Schneider, SMA, and other 48V hybrid inverters
- UL 9540A listed for safety compliance
Best For
Residential solar-plus-storage systems using any 48V hybrid inverter (Sol-Ark, Schneider XW+, SMA). Excellent for expandable storage — start with one unit, add more later.