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) | ||
| 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
2:04
1:21
0:37
3:46
5:02
4:56
28:11
6:48
1:08
PRODUCT COMPATIBILITY
Fortress Power Envy Inverters
Monitor and control your eForce ESS. Anywhere! Anytime!
✅ Monitor Performance of Each Battery
✅ Update Firmware Over The Air
✅ Participate in Virtual Power Plant Programs
