Fortress Power eVault MAX 18.5 kWh Battery
Built to Last Whole-Home Power
The eVault MAX 18.5 kWh is Fortress Power’s most advanced 48V lithium iron phosphate (LFP) battery, delivering whole-home and light commercial energy storage in a compact, all-in-one design. Scalable up to 370 kWh, it’s ideal for applications ranging from off-grid living and backup power to solar self-consumption and peak demand reduction.
Engineered for simplicity and performance, the eVault MAX features AC and DC coupling options and a serviceable top-access design that makes installation faster and more reliable. Whether you’re powering a home, small business, or critical backup system, the eVault MAX offers the safety, capacity, and flexibility to get the job done.
Features:
High-Capacity, Scalable Storage
Delivers 18.5 kWh of energy storage, scalable up to 370 kWh, making it ideal for whole-home backup, large residential projects, and light commercial applications.
Long-Lasting Performance
Engineered for durability with 8,000+ cycles at 80% DoD, the eVault MAX ensures dependable, long-term energy storage and lower lifetime costs.
Exceptional Efficiency
Operates at up to 98% round-trip efficiency at 0.5C, maximizing energy savings and performance across a wide range of usage scenarios.
Smart Battery Management System (BMS)
Equipped with a digital BMS for cell-level monitoring, automatic balancing, and enhanced safety — ensuring consistent, optimized operation.
Climate-Controlled Performance
Engineered for consistent reliability in both hot and cold environments, ensuring optimal battery operation year-round.
Certified for Safety & Compliance
Fully compliant with UL1642, UL1973, and UL9540 safety standards, ensuring peace of mind and simplified permitting and inspection processes.
Installer-Friendly Design
Features top-cover service access for easy installation and maintenance, reducing labor time and minimizing installation errors.
Integrated Display & Smart Connectivity
Includes a built-in LCD touchscreen for real-time performance metrics and supports closed-loop inverter communication for seamless energy management.
Specifications:
| Total Energy (kWh) | 18.5 |
| Capacity[Ah] | 360 |
| Nominal Voltage [V] | 51.2 (48) |
| Voltage Range[V] | 48-55 |
| Recommended Charge Current [A] | 150 |
| Max. Charge Current (Continuous)[A] | 180 |
| Max. Discharge Current (Continuous)[A] | 180 |
| Max. Pulse Current (for 10 sec) [A] | 200 |
| Charging Temperature[F] | 32 to 120 |
| Discharging Temperature[F] | 14 to 77 |
| Dimension [H xW x D, inch] | 20.3 x 20.3 x 42.2 |
| Weight[lbs] | 520 |
| Enclosure Protection Rating | IP55 |
| Mounting options | Floor standing |
| Certificates | UL 1642, UL1973, UL9540 |
| Warranty | 10 Years |
| Scalability | Maximum 20 in Parallel (370 kWh) |
| Communication | CAN/RS485 |
| High Current Circuit Breaker | 250A |
| Efficiency | >98% |