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Time-of-Use & Peak Charges
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VPP / EnergyBroker Programs
Products for Homes
Batteries
eBoost Scalable Energy Storage System
eForce Stackable Whole-Home Energy Storage System
eFlex MAX 5.4kWh
eVault MAX 18.5kWh LFP Battery ®
Inverters
Envy Duo 21 Inverter
Envy True 12kW
Envy 8kW/10kW Inverter
Solo 6.5K Inverter
EdgeOn Duo 9/15 Inverter
Accessories
DuraRack – Indoor / Outdoor Enclosure
FlexTower All-in-One ESS Enclosure
Guardian Products
Legacy LFP Products
eFlex 5.4kWh LFP Battery
eVault 18.5kWh LFP Battery
LFP-5 & LFP-10 Battery Series
LFP-10 MAX – 10kWh Lithium Battery
How Much Can It Power?
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System Recommendation Tool
Savings & Incentives
Rebates & Incentives
EnergyBroker
Homeowner Success Stories
Share Your Success Story
Homeowner Success Stories
Find an Installer Near You
Download the Owner Mobile App
Installers
Become a Partner
Certified Installer Program
New Dealer Application
Installer Resources
Tools
Battery & Inverter Wiring Validator
PV String Size Calculator
System Recommendation Tool
All Products
Digital Product & Marketing Assets
EnergyBroker
Inverter Compatibility Guide
List Your Company
Product Documentation
Trainings & Events
Connect with Fortress Power In Person
Education & Training Portal
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Tell Us About Your Project
Apply to Become a Dealer
Download the Pro Mobile App
Commercial & Industrial
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eSpire Nano
eSpire 290FC Energy Storage System
eSpire Mini
eSpire 306 Energy Storage System
Keystone EMS
C+I Case Studies
Start a C+I Project Quote
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Create a Support Ticket
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Register or Submit a Warranty Claim
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Fortress Power Envy Duo 21 | Data Sheet
File size: 871.68 KB
Created: 07/15/2026
Updated: 07/15/2026
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