eBoost Scalable Energy Storage SystemBoost Performance. Boost Reliability. The Fortress Power eBoost is a high-capacity, modular energy storage solution built for residential and light commercial applications. With 16kWh of usable energy per unit and the ability to scale up to 256kWh, eBoost is engineered to handle high load demands while offering the flexibility of stackable, parallel installations. Built-in heating elements, an IP65 weatherproof enclosure, and integration with the eWay wireway system allow for clean, all-weather installs.
When paired with the Envy Duo 21 inverter, the eBoost forms a fully integrated, whole-home energy storage systemùideal for backup power, energy independence, and more.
Applications- Residential
- Light Commercial
- Small Retail
Higher Capacity Per Module- Delivers 16kWh of energy storage per unitùideal for homes or businesses with higher load profiles or limited install space.
Expandable to 256kWh- Easily scale your system by connecting up to 16 units in parallel, giving you the flexibility to grow as your energy needs evolve.
Integrated eWay Wireway System- Built-in busbars, conduit ports, LED indicators, and an emergency shutoff make for clean, code-compliant installations with fewer external components.
All-Weather Durability- IP65-rated and equipped with internal heating elements for reliable performance in extreme conditions, from freezing temperatures to high humidity.
Whole-Home Compatibility- Pairs with the Fortress Power Envy Duo 21 inverter for seamless whole-home backup and energy management.
Quick Scale & Deploy- Modular, scalable design with fast-connect hardware reduces install time and labor while maintaining a clean, professional appearance.
eWay vs. eWay Lite ù Which One Do You Need?The eBoost 16kWh can be paired with either the eWay or eWay Lite. Both enable fast installs, clean wiring, and seamless integration with Fortress Power Envy inverters ù but each is designed for different system sizes and expansion plans.
eWay ù Best for Multi-Battery & Whole-Home SystemsChoose the eWay if you want room to grow.- 750A Three-Terminal Busbar: Designed for paralleling multiple eBoost batteries for larger capacity systems.
- Inverter-Ready Mounting Surface: Removable top cover allows you to mount the Envy Duo 21, Envy True 12, Envy 10, or Envy 8 directly on top.
- Integrated Rapid Shutdown: Built-in RSD switch for battery, PV, and AC output to meet NEC code.
- Smart Connectivity: Includes back knockouts, status LED indicator, and a Wi-Fi antenna port for Guardian monitoring.
- Installer-Friendly Features: DIN-rail bracket allows clean, direct mounting of the Guardian (optional).
Recommended for: Whole-home backup, multi-battery scaling (up to 256kWh), VPP participation, and any installation expecting growth.
eWay Lite ù Best for Single or Secondary BatteriesIdeal when you only need one battery + one inverter.- 250A Battery Terminal: Perfect for single-battery configurations.
- Compact, Cost-Optimized Design: No rear knockouts, no status indicator, and no Wi-Fi antenna port.
- Side-Mounted Inverter Support: Designed for installations where the Envy inverter is mounted beside the battery, not stacked on top.
- Power Switch Included: Provides safe system shutdown ù however, RSD for battery cutoff is not integrated.
Recommended for: Smaller backup systems, off-grid cabins, sheds, RVs, and applications that will not add more batteries in the future.
| 16kWh | 32kWh | 48kWh |
| GENERAL DATA |
| Weight | 304.2 lbs (138 kg) | 608.4 lbs (276 kg) | 912.6 lbs (414 kg) |
| Operating Temperature | -4 ºF – 140 ºF (-20 ºC – 60 ºC)* |
| Ingress Protect | Degree IP65 |
| Communication | PCS CAN/RS485; Parallel:CAN |
| Dimensions (W*D*H) | eWay : 22.84 x 9.52 x 10.18 in (580 x 241.9 x 258.5 mm) | Battery: 22.28 x 11.27 x 37.81 in (566 x 286 x 960.2 mm) |
| Warranty | 10 years |
| Mounting Options | Ground-Mount, Floor Standing, Wall-Hanged (Separate Accessory) |
| BATTERY SPECIFICATIONS |
| Maximum Units In Parallel | 16 | 8 | 5 |
| Cell Type | Tier-1 Prismatic 16 Cell LFP |
| Nominal Capacity | 314Ah | 628Ah | 942Ah |
| Nominal Energy | 16.077kWh** | 32.154kWh** | 48.231kWh** |
| Nominal Voltage | 51.2V |
| Re-charge Voltage | 49V |
| Cut-off Voltage | 41.6V |
| Maximum Short-Circuit (A) | 2000A, 17ms |
| Operating Voltage Range | 41.6-57.6V |
| Closed-Loop Charge/Discharge | 180/250 A | 360/500 A | 540/750 A |
| Bulk/Absorption Charge | 55.2V |
| Max Charge/Discharge | 314A/10s | 628A/10s | 942/10s |
| Surge Discharge Power W | 16kW/10s | 32kW/10s | 48kW/10s |
| Cycle Life @ EOL 70% | 8000 Cycles |
| Altitude (m) | <6561ft. (<2000m) |
| STANDARDS & CERTIFICATIONS |
| Safety Standards | UL1973, ANSI/CAN/UL9540:2023, UL9540A |
| Listings | CEC, LUMA, oGPE |
| Transportation | UN38.3 |