eVault Max 18.5kWh LFP Battery ®

eVault MAX 18.5 kWh | Whole-Home Power, Built to Last

A high-capacity 48V LFP battery designed for whole-home backup, seamless integration, and long-term energy independence — with 18.5 kWh of reliable storage.

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Product Compatibility

eVault MAX 18.5kWh

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.

Applications

Residential

Light Commercial

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.

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.
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.

PRODUCT INFORMATION

Specifications
Downloads


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%

Manuals

Warranty

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VIDEO LIBRARY

eVault MAX 18.5kWh Video Library

5 Videos

Fortress Power Presents The eVault Max 18.5!