Fortress Power EVault Max 18.5kWh LFP Battery

The newest innovative Lithium Iron Phosphate battery from Fortress Power is the eVault Max 18.5 kWh.

An all-in-one solution for your residential and commercial needs. Scalable up to 370kWh with a serviceable top cover access to make installation of this battery simple and worry free.

The eVault Max is AC/DC coupled to solar arrays and works for many applications that require solar storage, including Off-Grid, Back Up power, self-supply and Peak Charge Reduction just to name a few.


What’s included:

  • Large LED Display screen
  • Sleek Industrial-Grade Aluminum
  • Front-Serviceable Cover
  • Transportable on wheels

The eVault Max 18.5 is The Largest Single Residential Battery On The Market:

  • Safe Lithium Iron Phosphate Technology (LiFeP04)
  • High Durability and Long-Lasting
  • Closed Loop Communication with Inverters
  • Scalable from 18.5 kWh – 370 kWh
  • Intelligent Digital Processor Based BMS
  • Advanced cell level monitoring and balancing
  • IP55 Aluminum Industrial Grade Enclosure
  • Touch screen LCD performance display

The Built-In Smart and Reliable Relay-Based Battery Management System integrates multilevel safety concepts for excellent performance:

  • Overcharge and Deep Discharge Protection
  • Over-heat protection
  • Over Current Protection
  • Cell Monitoring and Balancing
  • Voltage and Temperature Monitoring
  • Optimized Internal Structure – Easily Serviceable
  • Handles More Surge Capacity from Inverters

Use solar power all day and night – even during grid outages:

  • Provide power during grid outages
  • Lower your electrical bill by avoiding having to buy electricity at peak times
  • Enjoy a generous tax credit when incorporating with solar (US Only)
  • Increase your independence from the utility grid

Additional information

Weight 520 lbs
Dimensions 20.3 × 20.3 × 42.2 in

Fortress Power


eVault Max 18.5

Rated Power Output [W]


Warranty [Years]




Fortress Power is a leading provider of energy storage solutions for solar consumers. Their products, including the Fortress Power eFlex and Fortress Power eVault, are designed to provide reliable and cost-effective energy storage for homes and businesses. The eFlex is a modular battery system that can be expanded as needed to meet changing energy demands, while the eVault is a high-capacity battery designed for longer-term energy storage. Both products offer features such as remote monitoring and easy installation. Fortress Power's commitment to quality and sustainability, as well as their focus on customer service and support, make them a trusted choice for solar energy consumers in need of energy storage solutions.