The eForce is a 48V, 9.6kWh LiFePO4 battery module from Fortress Power, built for modular off-grid and grid-tied energy storage. It stacks with additional eForce modules using Wireless Quick Plugs, and it is designed to pair with the eWay wireway and compatible Fortress Power inverters. This module is sold as a standalone 9.6kWh unit — it is not a complete system on its own.
Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
Why This Matters in the Field
Fortress Power has built a reputation on LiFePO4 systems for off-grid and grid-tied residential storage across North and Latin America. The eForce module is their newest stackable platform, built around a 15-cell configuration (note: this differs from the 16-cell configuration used in Fortress Power's eVault MAX, eFlex MAX, and eBoost batteries — do not assume interchangeability between those product lines and eForce). At 9.6kWh per module, one unit gives you a meaningful chunk of usable storage; stacking multiple modules is how you scale to whole-home or small commercial capacity.
Battery Characteristics
- Chemistry: LiFePO4 (Lithium Iron Phosphate)
- Nominal Voltage: 48V
- Capacity: 9.6kWh per module
- Cell Configuration: 15-cell (Fortress Power's eForce line specifically; not shared with the 16-cell eVault MAX/eFlex MAX/eBoost lines)
- Design: Modular, stackable, outdoor-rated enclosure with built-in temperature-controlled heating
Wiring & Configuration Limits
The eForce is designed to be connected to additional eForce modules through two Wireless Quick Plugs per unit, allowing you to add battery capacity without hardwired series/parallel busbar work between modules. Fortress Power states that up to 16 batteries can be combined into a system as large as 153kWh.
What this module is NOT: It is NOT sold as a complete turnkey energy storage system — it requires the eWay wireway (with built-in busbars, conduit ports, and emergency switch) and a compatible inverter, such as the Fortress Power Envy True 12kW, to function as a system. It is NOT confirmed compatible with generic third-party inverters in the source data provided; pairing outside the Fortress Power ecosystem is [NEEDS VERIFICATION]. Series/parallel wiring limits beyond the stated 16-module/153kWh maximum are [NEEDS VERIFICATION].
Pro-Installer Tip
Stacking lithium modules without matching state-of-charge across units is a common source of imbalance in modular systems. Before commissioning a multi-module eForce bank, bring every module to a full charge individually if the installation manual calls for it, and verify balance using the system's built-in status LEDs before placing the bank into service. Skipping this step can cause one module's BMS to work harder than its neighbors, accelerating cell drift over years of cycling. Fortress Power rates the eForce for 8,000+ cycles — protecting that cycle life starts with balanced commissioning, not just correct wiring. Cross-check module status against the manufacturer's specified depth-of-discharge guidance in the Resources tab before assuming 100% DoD is appropriate for every install.
Key Benefits
- 8,000+ cycle life rated by the manufacturer, with fast charging capability described as not degrading cells
- Modular, stackable design — add capacity in 9.6kWh increments up to a 153kWh system (16 modules)
- Built-in temperature-controlled heating and an outdoor-rated enclosure for all-weather operation
- Real-time status LEDs for at-a-glance system health checks
- Connects via Wireless Quick Plugs, reducing hardwired interconnects between modules
- Eligible for Virtual Power Plant (VPP) participation in qualifying regions, per the manufacturer
Technical Specifications
| Spec | Value |
|---|---|
| Voltage | 48V |
| Capacity | 9.6kWh |
| Chemistry | LiFePO4 (Lithium Iron Phosphate) |
| Cell Configuration | 15-cell |
| Cycle Life | 8,000+ cycles |
| Max System Size | Up to 16 modules / 153kWh |
| Cold Weather Protection | Built-in temperature-controlled heating; outdoor-rated enclosure |
| Module Interconnect | Wireless Quick Plugs (2 per module) |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
Compatible with: Additional eForce 9.6kWh modules (stackable up to 16 units / 153kWh), the Fortress Power eWay wireway, and the Fortress Power Envy True 12kW inverter (bolts directly onto the eWay).
NOT compatible with / NOT included: This listing is for the eForce battery module only — the eWay wireway and inverter are separate components and are NOT included unless listed as a separate variant. It is NOT confirmed to use the same cell configuration or be interchangeable with Fortress Power's eVault MAX, eFlex MAX, or eBoost batteries, which use a 16-cell design. Use of a generic lithium or lead-acid charger in place of the manufacturer-specified inverter/charging setup is NOT recommended without manufacturer confirmation. Max continuous discharge/charge amps and peak discharge figures were not provided in the source data and are [NEEDS VERIFICATION].
FAQ
Is the SOLARMAN app owned or operated by Fortress Power?
No. SOLARMAN is a third-party monitoring platform that is not owned or operated by Fortress Power. It is used specifically for monitoring and managing the Solo 6.5K inverter.
How many eForce modules can I stack into one system?
Up to 16 batteries can be combined to form a system as large as 153kWh, according to the manufacturer.
Does the eForce battery use the same cell configuration as other Fortress Power batteries?
No. The eForce battery uses a 15-cell configuration, while the eVault MAX, eFlex MAX, and eBoost batteries use 16 cells.
Does the eForce come with an inverter included?
Not based on the specifications provided here. The eForce is a battery module; the Envy True 12kW inverter and eWay wireway are described as separate components that integrate with it.
Warranty & Support
Warranty terms for the eForce module were not included in the manufacturer specifications provided here. Refer to the "Resources (System Manuals and Warranty)" Tab above on this page for full warranty documentation. If you have questions about which components you need to build a complete eForce system, ask us before you order — we always reply back.
