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Fortress Power eForce 28.8 kWh Specifications
| Model | Fortress Power eForce 28.8 |
| Nominal Energy Capacity | 28.8 kWh |
| Battery Chemistry | Tier-1 Prismatic 15 Cell LFP |
| Nominal Voltage | 48V |
| Maximum Charge/Discharge | 250A / 250A |
| Cycle Life | 8,000 cycles @ 70% EOL |
| Weight | 705 lbs (320 kg) |
| Dimensions (W×D×H) | 24.4 × 9.4 × 72.9 inches |
| Operating Temperature | -4°F to 140°F (-20°C to 60°C) |
| Protection Rating | IP65 |
| Warranty | 10 years |
| Maximum Units in Parallel | 5 units |
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Fortress Power eForce 28.8 kWh Home Energy Storage System
SKU FORTRESS-EFORCE-28-8KWH-HESSContractor & DIY Discounts Available - Contact Us
The eForce 28.8 kWh Battery System
The Fortress Power eForce 28.8 kWh utilizes three stacked battery modules to achieve maximum vertical capacity in the eForce product line. This configuration maintains the same 24.4-inch width footprint while reaching 72.9 inches in height. Each of the three modules contains tier-1 prismatic LFP cells with the same 8,000-cycle rating and 20-year design life.
Operating at 250A maximum charge and discharge current, the three-module stack delivers 28.8 kWh of nominal energy storage. The system supports parallel connection of up to 5 complete stacks for a maximum system capacity of 144 kWh. All three modules connect via quick-plug technology and integrate through a single eWay wireway connection point.
eForce 28.8 kWh Battery System Features
- Maximum Stack Configuration: Three modules provide 28.8 kWh in a single vertical stack with 3×200Ah nominal capacity.
- Full Closed-Loop Performance: Achieves maximum 250A/250A charge/discharge rates in both closed-loop and open-loop configurations.
- Unified Management System: Single eWay connection manages all three modules with consolidated monitoring and emergency disconnect capability.
- VPP Optimized Capacity: 28.8 kWh capacity approved for select Virtual Power Plant programs nationwide for grid support incentives.
- Triple Heating System: Each module includes integrated heaters ensuring consistent -4°F to 140°F operation across all three batteries.
eForce Series Flexible Expansion Options
The eForce 19.2 kWh system grows with your energy needs through multiple expansion pathways:
- Maximum vertical height achieved with three stacked modules
- Parallel up to 5 complete three-module stacks for 144 kWh
- Maintain single-point monitoring and control for all connected batteries
Fortress Power eForce 28.8 kWh Battery System Review
The eForce 28.8 kWh maximizes vertical stacking capability to deliver substantial energy storage in a compact footprint. Despite containing three modules and weighing 705 pounds, the system maintains the same 24.4-inch width as smaller configurations. The quick-plug connections between modules create a unified system that operates through a single eWay interface, simplifying both installation and operation.
This configuration achieves the full 250A charge and discharge capability in both closed-loop and open-loop operation modes, providing maximum flexibility for different inverter configurations. The 14,400W surge power rating handles motor starts and other high-inrush loads. With the ability to parallel 5 complete stacks, the system can scale to 144 kWh while maintaining individual battery monitoring. The consistent tier-1 cell quality across all three modules ensures balanced performance throughout the 8,000-cycle lifespan, backed by Fortress Power's 10-year warranty with optional 30-year extension.
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