Skip to content

Fortress Power Inverters

Fortress Power inverters deliver reliable whole-home backup power through advanced all-in-one hybrid inverter systems. Designed for residential and commercial applications, these units combine solar, storage, and smart energy management in a single enclosure. From the popular Envy 12 kW model to high-voltage Avalon series units, Fortress inverters are built to reduce utility costs while providing uninterrupted power during outages.

Original price $1,689.00 - Original price $1,689.00
Original price
$1,689.00
$1,689.00 - $1,689.00
Current price $1,689.00

Fortress Power EV6500-S 6500W 48V Offgrid Split Phase Inverter

Fortress Power
in stock

Fortress Power EV6500-S 6500W Offgrid Split Phase Inverter Description AVAILABLE IN OCT 1ST 2025  Reliable, Flexible Power for Off-Grid and B...

View full details
Original price $1,689.00 - Original price $1,689.00
Original price
$1,689.00
$1,689.00 - $1,689.00
Current price $1,689.00
Original price $5,199.00
Original price $5,199.00 - Original price $5,199.00
Original price $5,199.00
Current price $4,590.00
$4,590.00 - $4,590.00
Current price $4,590.00

Fortress Power Envy 10kW All-In-One Split Phase Hybrid Inverter | 120/240VAC | 48VDC

Fortress Power
in stock

Fortress Power Envy True 10kW All-In-One Inverter | 120/240VAC | 48VDC Description The Fortress Power Envy 10kW is a whole-home, all-in-one inverte...

View full details
Original price $5,199.00
Original price $5,199.00 - Original price $5,199.00
Original price $5,199.00
Current price $4,590.00
$4,590.00 - $4,590.00
Current price $4,590.00
Save 12% Save %
Original price $2,650.00 - Original price $2,650.00
Original price
$2,650.00
$2,650.00 - $2,650.00
Current price $2,650.00

Fortress Power AVI-11, Avalon High Voltage 11.4 kW 120/240V Hybrid Inverter

Fortress Power
Out of stock

Fortress Power AVI-11, Avalon High Voltage 11.4 kW 120/240V Hybrid Inverter Description The Avalon is the newest innovation from Fortress Power. Th...

View full details
Original price $2,650.00 - Original price $2,650.00
Original price
$2,650.00
$2,650.00 - $2,650.00
Current price $2,650.00
Sold out
Original price $5,199.00
Original price $5,199.00 - Original price $5,199.00
Original price $5,199.00
Current price $4,429.00
$4,429.00 - $4,429.00
Current price $4,429.00

Fortress Power Envy 8kW All-In-One Split Phase Hybrid Inverter | 120/240VAC | 48VDC

Fortress Power
in stock

Fortress Power Envy 8kW All-In-One Split Phase Hybrid Inverter | 120/240VAC | 48VDC Description The Fortress Power Envy 8kW is a whole-home, all-in...

View full details
Original price $5,199.00
Original price $5,199.00 - Original price $5,199.00
Original price $5,199.00
Current price $4,429.00
$4,429.00 - $4,429.00
Current price $4,429.00
Save 15% Save %
Original price $7,228.00
Original price $7,228.00 - Original price $7,228.00
Original price $7,228.00
Current price $5,399.00
$5,399.00 - $5,399.00
Current price $5,399.00

Fortress Power Envy 12kW All-In-One Split Phase Hybrid Inverter | 120/240VAC | 48VDC

Fortress Power
in stock

Fortress Power Envy 12kW All-In-One Split Phase Hybrid Inverter | 120/240VAC | 48VDC Description The Fortress Power Envy True 12 kW – a whole-home,...

View full details
Original price $7,228.00
Original price $7,228.00 - Original price $7,228.00
Original price $7,228.00
Current price $5,399.00
$5,399.00 - $5,399.00
Current price $5,399.00
Save 25% Save %

Complete Electrical Storage Solutions for Modern Homes

When outages occur, Fortress inverters maintain critical loads with a switchover time of less than 10 milliseconds. The Envy 12 kW inverter leads the lineup, offering a 200A AC passthrough for true whole-home backup. This all-in-one solution integrates battery charging, automatic transfer switching, and UPS functionality in a weatherproof, IP65-rated enclosure.

The Envy series supports residential split-phase output at 120/240V AC, maintaining balanced loads across your home. Each unit includes MPPT solar input for efficient solar harvesting. Up to five Envy inverters can be installed in parallel, enabling system expansion up to 60 kW for larger properties or commercial use.

For users comparing hybrid systems, Schneider Electric Inverters offer scalable off-grid and backup solutions with advanced monitoring features. If you're looking for panel-level optimization, Enphase Microinverters offer unmatched system flexibility and resilience.

Advanced Battery Integration and Monitoring

Fortress inverters integrate seamlessly with lithium iron phosphate (LiFePO4) battery banks, creating a complete solar-plus-storage system. The Envy series operates with 48V LFP configurations, while the Avalon series supports high-voltage battery strings ranging from 150V to 450V DC.

Remote monitoring is available through the Fortress Power app, allowing full visibility into:

  • Battery state of charge and health
  • Solar generation and consumption trends
  • Grid import/export activity
  • System efficiency and performance data

For efficient grid-tied installations, Solis Inverters offer lightweight designs with multiple MPPTs and advanced monitoring via SolisCloud.

Peak Shaving and Grid Independence

Fortress Envy 8 kW, 10 kW, and 12 kW inverters support load shifting and peak demand management, helping reduce energy costs. Excess solar production is stored in your battery system during the day and used during high-demand evening hours. This setup provides grid independence while maximizing energy efficiency.

All Fortress inverters include advanced protection features such as integrated rapid shutdown transmitters and buttons, AFCI (Arc-Fault Circuit Interruption), and anti-islanding. Their IP65 enclosures ensure durability for both indoor and outdoor installations.

Frequently Asked Questions

What size Fortress Power inverter do I need for my home?

The Envy 8 kW is sufficient for most average-sized homes. Larger homes with higher power demands (e.g., multiple HVAC systems, pools, or workshops) may benefit from the 10 kW or 12 kW models.

Are Fortress inverters compatible with my existing solar panels?

Yes. All Envy and Avalon models feature MPPT solar inputs that support compatibility with most residential solar panel configurations and grid-tied systems.

Can I install multiple Fortress Power inverters?

Yes. The Envy series allows up to five inverters to be stacked in parallel for a combined output of up to 60 kW. Avalon units can also be used in larger commercial applications.

What batteries work best with Fortress Power inverters?

The Envy series is designed for use with 48V lithium iron phosphate (LFP) battery banks. Avalon models support high-voltage LFP battery strings between 150V and 450V DC.

Do Fortress Power inverters provide backup during outages?

Yes. All models feature automatic transfer switching with switchover times under 10 milliseconds, ensuring continuous power to critical loads during grid failures.