Fortress Power eVault MAX 18.5kWh Battery

Fortress Power eVault MAX 18.5kWh Battery

Name: Fortress Power eVault MAX 18.5kWh Battery
Brand: Fortress Power
SKU: eVault Max 18.5
Price: 6479.0 USD
Availability: InStock

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Fortress Power

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eVault Max 18.5

$6,479.00

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Fortress Power eVault MAX 18.5kWh Battery | Scalable to 370kWh

High-Capacity Energy Storage for Whole-Home & Light Commercial Applications

Built to Last. Ready for Anything.

The Fortress Power eVault MAX 18.5kWh is a 48V lithium iron phosphate (LFP) battery engineered for whole-home backup, off-grid living, and commercial energy storage. Each unit offers 18.5kWh of usable capacity and can scale up to 370kWh for larger systems.

Featuring a smart Battery Management System (BMS), high efficiency, and a service-friendly top-access design, the eVault MAX delivers reliable, future-ready performance for any AC or DC-coupled energy setup.

Key Features

High-Capacity, Scalable Energy Storage:
- 18.5kWh per battery, scale up to 370kWh
- Supports backup, peak shaving, or solar self-consumption
Ultra-Long Battery Life:
- 8,000+ cycles at 80% DoD
- Over 20 years of daily usage potential
Top-Tier Efficiency:
- Up to 98% round-trip efficiency at 0.5C
Advanced Battery Management System (BMS):
- Cell-level monitoring, balancing, and protection
- Communicates with compatible inverters for real-time data
All-Climate Durability:
- Performs reliably in a wide temperature range
- Suitable for indoor and outdoor installations
Certified for Safety and Compliance:
- Meets UL1642, UL1973, and UL9540 standards
Easy-to-Install Design:
- Top-access service panels and compact footprint
- Installer-friendly with reduced setup complexity
Built-In LCD Display + Smart Integration:
- Touchscreen shows real-time performance metrics
- Closed-loop integration with Fortress Power inverters

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

Parameter	Details
Total Energy	18.5 kWh
Capacity	360 Ah
Nominal Voltage	51.2V (48V)
Voltage Range	48–55 V
Recommended Charge Current	150 A
Max Charge Current (Continuous)	180 A
Max Discharge Current (Continuous)	180 A
Max Pulse Current (10 sec)	200 A
Charging Temperature	32°F to 120°F
Discharging Temperature	14°F to 77°F
Dimensions (H × W × D)	20.3 × 20.3 × 42.2 in
Weight	520 lbs
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%

Understanding Your Power Needs

Power Calculation Guide

Sizing Metric	Formula & Example
Energy Consumption (Wh)	Formula: Watts × Hours Example: 60W × 4 hrs = 240 Wh
Battery Capacity (Ah)	Formula: Watt-hours ÷ System Voltage (V) Example: 240 Wh ÷ 12V = 20 Ah
Inverter Size (W)	Formula: Total Watts × 1.25 (safety margin) Example: 300W × 1.25 = 375W → Use 400W inverter
Total Load Power (W)	Formula: Sum of all appliance watts used simultaneously Example: Light (10W) + Fan (75W) = 85W
Runtime (hrs) of Battery	Formula: (Battery Ah × Voltage) ÷ Total Load (W) Example: (100Ah × 12V) ÷ 240W = 5 hrs

Find Your Power Match

Need / Application	System Recommendation
Basic lighting + phone charging	Recommended Battery: 50Ah – 100Ah (12V) Inverter Size: 100W – 200W Notes: For small backup setups
Home office (laptop, fan, TV)	Recommended Battery: 150Ah – 200Ah (12V or 24V) Inverter Size: 500W – 1000W Notes: For moderate usage with 4–6 hours of backup
Home backup (fridge, lights)	Recommended Battery: 200Ah+ (24V or 48V recommended) Inverter Size: 1000W – 1500W Notes: Ideal for longer backups or heavier loads
Business / shop power backup	Recommended Battery: 300Ah+ (48V system) Inverter Size: 2000W – 3000W Notes: Suitable for commercial setups or extended power outages

Why Shop With Us

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Fast, Reliable Shipping: Shipped from U.S. warehouses with quick, dependable freight options — keeping your project on track.
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Expert Energy Guidance: Our solar and backup energy specialists are here to help with system design, product questions, and installation tips.
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Built for Energy Independence: Whether powering a cabin, prepping for emergencies, or going off-grid, our products are chosen for performance, reliability, and sustainability.

Fortress Power eVault MAX 18.5kWh Battery

$6,479.00

Fortress Power eVault MAX 18.5kWh Battery

Fortress Power

eVault Max 18.5

#1 Authorized Fortress Power Distributor

Free Shipping + No Sales Tax

Hassle-Free Returns & Exchanges

Talk To A Real Person

Fortress Power eVault MAX 18.5kWh Battery | Scalable to 370kWh

Key Features

Applications

What’s Included

Specification Sheets:

Manuals:

Quick Start Guide:

Fortress Power eVault MAX 18.5kWh Battery

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