Fortress Power eForce Stackable Energy Storage System | 9.6–268.8kWh | 15-Year Warranty | IP65 Rated
Energy Freedom. Power for All Conditions.
The Fortress Power eForce is a next-generation, stackable energy storage system designed for whole-home backup, off-grid living, and solar self-consumption. With each module delivering 9.6kWh of high-performance lithium iron phosphate (LFP) storage and scalable up to 268.8kWh, eForce provides powerful, long-lasting energy storage in a compact, easy-to-install package.
Using quick-connect wireless plugs, eForce modules stack vertically—no external wiring needed. Pair with the eWay wireway system and Fortress Envy Inverter for a sleek, integrated energy tower that’s IP65-rated, code-compliant, and ready for all-weather operation. Whether you’re protecting a home from outages or designing a light commercial energy system, eForce delivers reliable, intelligent, and scalable storage—without the complexity.
Key Features:
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Top-Tier LFP Technology: Each eForce module features automotive-grade lithium iron phosphate (LFP) cells, rated for over 8,000 cycles and a 20-year design life, ensuring unmatched durability, performance, and thermal stability.
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Stackable, Wireless Architecture: Build vertically up to three modules per stack (28.8kWh) using quick-plug wireless connectors—no cables, no mess. For larger systems, expand laterally up to 268.8kWh total.
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Integrated eWay Wireway System: Mounts the Envy Inverter directly to the eWay, a smart base with:
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Built-in busbars
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Emergency shutoff
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Conduit ports
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Real-time LED indicators
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Weather-resistant (IP65) enclosure
Together, they form a fully integrated energy tower for seamless AC or DC coupling.
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Rapid, Simplified Installation: Quick-connect design and modular construction cut down installation time and wiring errors—reducing labor costs and improving system reliability.
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Lower Total System Cost: By eliminating wireways, long cable runs, and external enclosures, the eForce architecture significantly reduces BOM (Bill of Materials) and simplifies code-compliant installation.
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All-Climate Performance: Designed for both indoor and outdoor use, with IP65 rating and built-in heaters for cold climates. Reliable performance in heat, cold, rain, or snow.
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Industry-Leading Warranty: Includes a 15-year standard warranty with an option to extend up to 30 years—offering long-term peace of mind and maximum return on investment.
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Virtual Power Plant (VPP) Ready: Approved for VPP and demand response programs nationwide. Get paid to share energy with the grid during peak demand periods while supporting grid stability.
Applications:
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Whole-Home Backup Power
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Residential Solar + Storage
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Light Commercial & Retail Systems
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Off-Grid Cabins and Microgrids
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Demand Response & VPP Programs
What’s Included:
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1 × eForce 9.6kWh Battery Module
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Optional: Stack of 2 or 3 Modules (up to 28.8kWh per stack)
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eWay Wireway System (Required for Envy Inverter Mounting)
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Quick-Connect Wireless Stack Plugs
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Integrated Status LEDs & Emergency Shutoff
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User Manual & 15-Year Warranty
Envy Inverter and eWay system sold separately. Full stack requires eWay base for code-compliant installation.
Specifications
| Battery Parameters |
9.6 kWh
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19.2 kWh vertical
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19.2 kWh horizontal
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28.8 kWh vertical
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28.8 kWh horizontal
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| Maximum Units In Parallel |
16 |
8/16 |
5/16 |
| Cell Type |
Tier-1 Prismatic 15 Cell LF |
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| Nominal Capacity |
200Ah |
2*200Ah |
3*200Ah |
| Nominal Energy |
9.6KWh |
19.2KWh |
28.8KWh |
| Operating Voltage Range |
39~54V |
39~54V |
39~54V |
| Nominal Charge/Discharge (A) |
120/160 |
240/250 |
240/320 |
250/250 |
360/480 |
| Open Loop Charge/Discharge (A) |
100/100 |
100/100 |
200/200 |
100/100 |
300/300 |
| Bulk Absorption Charge (V) |
51.5V |
| Open Loop/Closed Loop (V) |
51.5V |
| Max Charge/Discharge (A) |
195/195 |
250/250 |
390/390 |
250/250 |
585/585 |
| Surge Discharge Power W (10s) |
14,400 |
14,400 |
28,800 |
14,400 |
43,200 |
| Cycle Life @ EOL 70% |
8000 |
| General Data |
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| Ambient Temperature Range |
-4-140°F (-20-60°C) |
| Ingress Protect Degree |
IP65 |
| Communication |
RS485/Wi-Fi/CAN |
| Weight |
249 Ibs (112.9 kg) |
465 Ibs (210.9 kg) |
681 Ibs (308.9 kg) |
| Dimension (W*D*H) (mm) |
30.89 x 9.08 x 33.79 in
(784 x 231 x 858 mm) |
30.89 x 9.08 x 53.46 in
(784 x 231 x 1358 mm) |
30.89 x 9.08 x 73.13 in
(784 x 231 x 1857 mm) |
| Warranty |
10 years |
| Standard & Certification |
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| Safety Standard |
UL1741, UL1973, UL9540/A DC ESS |
| EMC |
IEEE1547, FCC, SDOC |
| Grid Standards |
IEEE1547 |
| Transportation |
UN38.3 |
Shopping Guide
Why Shop With Us
Why Shop With Ecogrid Supply?
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Authorized & Trusted Dealer: We’re fully authorized for every brand we carry, so you get genuine products with full manufacturer warranties.
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Fast, Reliable Shipping: All items ship from our U.S. warehouses with quick and dependable freight options to keep your project on track.
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Real Human Support, 7 Days a Week: Reach us by phone, email, or live chat — no bots, no overseas call centers, just real people who know off-grid power systems.
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Expert Energy Guidance: Our solar and backup energy specialists are ready to help you with design, planning, product questions, and installation tips.
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USA-Based Service: Our team proudly operates here in the United States, providing local, knowledgeable, and friendly support.
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Built for Energy Independence: Whether you’re powering a cabin, prepping for emergencies, or going off-grid, our products are selected for performance, reliability, and sustainable operation.
