Fortress Power eVault MAX 18.5kWh Battery | Scalable to 370kWh | 8,000+ Cycles | Whole-Home & Light Commercial

Fortress Power eVault MAX 18.5kWh Battery | Scalable to 370kWh | 8,000+ Cycles | Whole-Home & Light Commercial

Built to Last. Ready for Anything.

The Fortress Power eVault MAX 18.5kWh is a high-performance 48V lithium iron phosphate (LFP) battery engineered for whole-home backup, off-grid living, and commercial energy storage. With a massive 18.5kWh capacity per unit and support for scaling up to 370kWh, the eVault MAX offers unmatched versatility and long-term value for energy independence, backup power, and solar optimization.

Designed for simplicity, performance, and durability, this compact battery integrates easily with both AC and DC-coupled systems. With a smart Battery Management System (BMS), high efficiency, and a service-friendly top-access design, the eVault MAX is the backbone of any reliable, future-ready energy system.

Key Features:

• High-Capacity, Scalable Energy Storage: Store 18.5kWh per battery, and scale up to 370kWh with multiple units to meet the demands of large homes or light commercial facilities. Perfect for backup power, peak shaving, or self-consumption.
• Ultra-Long Battery Life: Built to last with 8,000+ cycles at 80% depth of discharge (DoD)—that’s over 20 years of daily use, ensuring excellent return on investment and long-term reliability.
• Top-Tier Efficiency: Achieves up to 98% round-trip efficiency at 0.5C, meaning more of your solar or stored energy goes where it should — powering your life, not being lost in conversion.
• Advanced Battery Management System (BMS): Includes cell-level monitoring, balancing, and protection to ensure safe, stable operation and prolonged battery life. Communicates directly with compatible inverters for real-time data and diagnostics.
• All-Climate Durability: Engineered to perform reliably in a wide range of temperature and environmental conditions, making it ideal for both indoor and outdoor installations — from cold winters to scorching summers.
• Certified for Safety and Compliance: Tested to meet leading safety standards including UL1642, UL1973, and UL9540, the eVault MAX simplifies permitting and meets the most rigorous inspection requirements.
• Easy-to-Install Design: With top-access service panels and a compact footprint, the eVault MAX is installer-friendly — reducing setup time, complexity, and potential points of failure.
• Built-In LCD Display + Smart Integration: View real-time performance metrics directly on the built-in touchscreen, and enjoy seamless integration with Fortress Power inverters via closed-loop communication.

Applications:

• Whole-Home Backup Power
  
• Off-Grid Living & Remote Cabins
  
• Time-of-Use & Peak Demand Shaving
  
• Light Commercial Storage
  
• Solar Self-Consumption
  
• Resilient Microgrid Systems
  

What’s Included:

• 1 × Fortress Power eVault MAX 18.5kWh LFP Battery
  
• Pre-installed Smart BMS
  
• Built-in LCD Touch Display
  
• User Manual & Warranty Information
  
• Mounting & Wiring Accessories (varies by installer configuration)
  

Compatible with Fortress Power Envy and Solo inverter series, plus third-party inverters with closed-loop communication.

Specifications

Shopping Guide

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