Fortress Power eVault MAX 18.5kWh LFP Battery
The Fortress Power eVault MAX 18.5 kWh is a high-capacity 48V lithium iron phosphate (LFP) battery designed for whole-home and light commercial energy storage. Its compact, all-in-one design makes it easy to install, while scalable capacity up to 370 kWh lets you grow your system as your energy needs increase.
With AC and DC coupling options and a serviceable top-access design, the eVault MAX is fast and reliable to install, whether for off-grid living, solar self-consumption, backup power, or peak demand reduction. Delivering safe, flexible, and high-performance energy, it’s ideal for homes, small businesses, and critical backup systems.
Applications
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Off-grid homes and cabins
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Home backup power
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Light commercial energy systems
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DIY solar setups
eVault MAX 18.5kWh LFP Battery Features
Built to Last Whole-Home Power
🔋 High-Capacity, Scalable Storage
18.5 kWh per unit, expandable up to 370 kWh — perfect for whole-home backup, large residential setups, and light commercial applications.
🔋 Long-Lasting Performance
8,000+ cycles at 80% DoD for reliable, cost-efficient energy storage over decades.
✅ Exceptional Efficiency
Up to 98% round-trip efficiency ensures maximum energy savings in all usage scenarios.
💻 Smart Battery Management System (BMS)
Digital BMS monitors and balances each cell automatically, enhancing safety and optimizing performance.
🌡️ Climate-Resilient Design
Operates reliably from -4°F to 140°F, suitable for both hot and cold environments.
🛡️ Certified for Safety & Compliance
UL1642, UL1973, and UL9540 approved — simplifies permitting and inspections.
🪛 DIY-Friendly Access
Top-cover service design for easy installation and maintenance, reducing labor and errors.
📊 Built-In Display & Smart Connectivity
LCD touchscreen shows real-time performance metrics; supports inverter communication for streamlined energy management.
eVault MAX 18.5kWh Technical Specs & Downloads
Get the details you need—spec sheets, manuals, and performance data all in one place. We link directly to the manufacturer's site, so you know you always have the most up-to-date information.
| 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% |
Introduction to the Fortress Power eVault MAX 18.5kWh LFP Battery
