Fortress Power eVault MAX 18.5kWh LFP Battery
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.
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
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.
🌦️ Versatile Climate Resilience
Built to perform in extreme environments with a discharge temperature range of -4°F to 140°F, ideal for both hot and cold climates.
🛡️ Certified for Safety & Compliance
Fully compliant with UL1642, UL1973, and UL9540 safety standards, ensuring peace of mind and simplified permitting and inspection processes.
🪛 DIY-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.
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
