eForce Stackable Whole-Home Energy Storage System
Pairing powerful 9.6 kWh LFP batteries with the Envy Inverter, eForce delivers a flexible, stackable solution for backup power, off-grid living, and energy independence.
eForce Stackable Whole-Home Energy Storage System
Energy Freedom, Power for All Conditions
The eForce Stackable Energy Storage System is Fortress Power’s most advanced and scalable solution for whole-home backup, off-grid living, and solar self-consumption. Each 9.6 kWh lithium iron phosphate (LFP) battery is designed for long-lasting performance with 8,000 cycles and a 20-year design life, making it ideal for residential and light commercial applications.
Engineered for flexibility, eForce modules can be stacked vertically (up to 3 modules) using wireless quick-connect plugs — no cables required — or expanded laterally for systems up to 268.8 kWh. Each stack integrates with the eWay, a smart wireway featuring built-in busbars, conduit ports, an emergency shutoff, and real-time LED status indicators. The Envy Inverter mounts directly to the eWay, forming a streamlined, weather-resistant (IP65) energy tower. This modular architecture enables effortless installation, seamless AC/DC coupling, and full compatibility with Fortress Power’s monitoring app.
Whether you’re building a new solar + storage system or upgrading an existing one, the eForce delivers clean, reliable power and unmatched scalability — all backed by an industry-leading warranty for long-term confidence and protection.
Applications
Residential
Light Commercial
Small Retail
FEATURES
Now Backed by a 15-Year Warranty
When installed as a complete system—including the eForce battery, Envy inverter, and Guardian Gateway—the eForce battery module is eligible for Fortress Power’s new industry-leading 15-year warranty (or 8,000 cycles at 80% DoD). This warranty offers peace of mind and long-term protection for system owners.
PRODUCT INFORMATION
| 9.6 kWh | 19.2 kWh vertical | 19.2 kWh horizontal | 28.8 kWh vertical | 28.8 kWh horizontal | |
| Battery Parameters | |||||
| Maximum Units In Parallel | 16 | 8/16 | 5/16 | ||
| Cell Type | Tier-1 Prismatic 15 Cell LF | ||||
| 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 | |||||
| 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) |
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| Warranty | 10 years | ||||
| Standard & Certification | |||||
| Safety Standard | UL1741, UL1973, UL9540/A DC ESS | ||||
| EMC | IEEE1547, FCC, SDOC | ||||
| Grid Standards | IEEE1547 | ||||
| Transportation | UN38.3 | ||||
Manuals
Warranty
Certifications
Data Sheets
VIDEO LIBRARY
eForce ESS Video Library
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PRODUCT COMPATIBILITY
Two Apps. One Powerful Energy Ecosystem.
The Fortress Power Owner and Pro apps give homeowners and installers the right tools to monitor, manage, and support Fortress Power systems, anytime, anywhere.
