The Fortress Power eForce is a 48 volt, 9.6kWh lithium iron phosphate (LiFePO4) battery module built for stacked, whole-home or off-grid energy storage. It is modular by design: add capacity by connecting additional 9.6kWh units, up to a 16-battery, 153kWh system, using the included Wireless Quick Plug connections.
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.
What This Battery Is (and What It Is Not)
This is a stationary, stackable home/off-grid energy storage battery, not a golf cart, RV, or marine battery. It is designed to sit in a fixed installation location — indoor or outdoor, per manufacturer siting requirements — and pair with compatible Fortress Power inverters and the eWay wireway system. Chemistry is LiFePO4, which offers a longer cycle life and better thermal stability than AGM, Gel, or Flooded Lead Acid batteries, though it also requires a chemistry-specific charge profile from a compatible inverter/charger — it is not a drop-in replacement for a lead-acid bank without confirming your charge controller settings.
Battery Characteristics
- Chemistry: Lithium Iron Phosphate (LiFePO4)
- Nominal Voltage: 48V
- Capacity: 9.6kWh per module
- Form Factor: Modular, stackable enclosure; designed for outdoor-rated, all-weather installation
- Cold-Weather Protection: Built-in temperature-controlled heating element per manufacturer literature
- Status Indicators: Real-time LED status indicators on the enclosure
Wiring & Configuration Limits
The eForce is built for parallel expansion: individual 9.6kWh modules connect to one another using two Wireless Quick Plugs per unit, and the manufacturer states the system can scale up to 16 batteries for a combined 153kWh. Each module connects to the eWay wireway, which houses the busbars, conduit ports, and emergency disconnect switch for the stack.
Not stated in source data: whether individual modules can be series-connected to raise system voltage beyond 48V. Treat this configuration as unsupported unless confirmed in the manufacturer installation manual. [NEEDS VERIFICATION]
This battery is not intended for use as a starter/cranking battery, is not a golf-cart or marine battery, and should not be paired with a non-Fortress-Power inverter/charger without confirming compatibility with the eWay and communication protocol.
Pro-Installer Tip
Stacking multiple lithium modules in parallel without matching state-of-charge before first connection is a common source of inrush current and BMS lockout events on day one. Bringing every module to a similar charge level before joining them on the same bus, using the system's own monitoring/status LEDs (or a shunt-based battery monitor at the inverter) to confirm balance, protects against cell imbalance across the stack — a failure mode that shortens pack life far faster than normal cycling. As a professional standard, plan discharge depth around the manufacturer's rated 8,000+ cycle life rather than draining the system to zero on a routine basis; a LiFePO4 pack of this type is generally cycled deeper than a lead-acid bank (which is typically limited to about 50% DoD), but working within the specified cycle life numbers is what gets you the rated longevity.
Key Benefits
- 8,000+ rated charge cycles per manufacturer specification, supporting long-term daily cycling
- Modular scaling from a single 9.6kWh module up to a 153kWh system (16 units)
- Built-in temperature-controlled heating for outdoor, all-weather installation
- Wireless Quick Plug connections simplify adding capacity in the field
- Real-time LED status indicators for at-a-glance system health
- Compatible with Virtual Power Plant (VPP) programs in eligible areas, per manufacturer
Technical Table
| Spec | Value |
|---|---|
| Voltage | 48V |
| Capacity | 9.6kWh |
| Chemistry | LiFePO4 (Lithium Iron Phosphate) |
| Cycle Life | 8,000+ cycles |
| Max System Size | Up to 16 batteries / 153kWh |
| Cold-Weather Protection | Built-in temperature-controlled heating |
| Enclosure Rating | Outdoor/all-weather rated (per manufacturer) |
| SKU | EFORCE9.6/ |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
Compatible with: Additional eForce 9.6kWh modules wired in parallel via Wireless Quick Plugs, up to a 16-unit/153kWh system; the eWay wireway; and the Fortress Power Envy True 12kW inverter, which mounts directly to the eWay.
NOT confirmed compatible with: Series wiring to raise system voltage above 48V [NEEDS VERIFICATION]; non-Fortress-Power inverters or charge controllers not listed in manufacturer documentation; standard lead-acid chargers are not appropriate for this LiFePO4 chemistry and should not be used.
Not included: Inverter, eWay wireway, and mounting/enclosure hardware are separate components — confirm what ships with this SKU before ordering a complete system.
FAQ
What chemistry is the Fortress Power eForce battery?
It uses Lithium Iron Phosphate (LiFePO4) cells.
How many eForce modules can I connect together?
Per the manufacturer, up to 16 battery modules can be combined into a single system for a total of 153kWh.
Can this battery be used off-grid in cold climates?
The enclosure includes built-in temperature-controlled heating and is described as all-weather/outdoor rated by the manufacturer.
What is the rated cycle life of the eForce battery?
The manufacturer states 8,000+ cycles.
Can I wire these batteries in series to increase voltage?
This is not confirmed in available manufacturer data supplied here. Confirm series configuration limits with the manufacturer installation manual before attempting it. [NEEDS VERIFICATION]
Warranty & Support
Warranty terms for the eForce are not included in the data provided here. Refer to the "Resources (System Manuals and Warranty)" Tab above for the manufacturer's current warranty documentation before you order. If you have questions about how this battery fits your system plans, ask us before you order — we always reply back.
