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Fortress Power Envy Inverter 12kW


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Original price $8,530.00
Original price $8,530.00 - Original price $8,530.00
Original price $8,530.00
Save $2,271.00 Save $0.00
Current price $6,259.00
$6,259.00 - $6,259.00
Current price $6,259.00

Item Status : Limited Stock

Leaves Manufacturer's Warehouse in 2-3 Business Days. ETA Delivery 5-7 days. Easy 30 Day Returns.

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  • High Quality U.S Made Products
  • No Sale Tax (Exclusions Apply)
  • Free & Fast Delivery
  • Manufacturer Warranty Included

Cinematic Corner

Presenting the Fortress Power Envy 12kW inverter, an integrated solution designed to power your entire home seamlessly. Compatible with the eFlex 5.4 kWh, eVault MAX 18.5 kWh, or LFP-10 MAX batteries, this powerhouse delivers up to 12kW (50A @ 240V) of backup power via a robust 200A AC passthrough.

Equipped with a built-in generator input featuring AC/DC coupling, the Envy ensures versatility for both on- and off-grid operations. Its 3 MPPT output supports a maximum PV array capacity of 21 kW, optimizing solar energy utilization.

Boasting an IP65 rating, the Envy is suitable for installation indoors or outdoors. It features a convenient built-in generator port and pre-installed AC & DC breakers for swift installation. With online monitoring capabilities through our dedicated app, you can keep track of your system's performance from anywhere.

Key Features:

  • 200A AC Passthrough Capacity for Whole Home Backup
  • 3MPPT Output Supports Up to 21kW PV Array
  • AC / DC Coupling for Enhanced Compatibility
  • Built-In Generator Port for Added Convenience
  • Supports Parallel Connection of Up to 5 Units
  • Online Monitoring via Dedicated App
  • Color LCD Touch Screen Interface
  • Future Compatibility with 3 Phase Systems

Supported Applications:

  • Backup Power
  • Off-Grid Operations
  • Zero Export Solutions
  • Time-Of-Use Optimization
  • Peak Shaving

Input DC (PV Side):

  • Max. DC Input Power for Single MPPT: 12000W/7000W/7000W (1 x 12kW, 2 x 7kW)
  • Max. PV Input Power: 21000W
  • Max. PV Power Delivered to Battery & AC Outputs: 18000W
  • DC Input Voltage Range: 100V-600V
  • Nominal DC Input Voltage: 360V
  • Full Power MPPT Voltage Range: 230V-500V
  • Max. DC Input Current: 25A/15A/15A
  • MPPT Number/(Strings per MPPT): 3 (2/1/1)

Output/Input AC (Grid):

  • Continuous AC Power to Grid: 12000W (240V)
  • Continuous AC Power to Load with Grid or Generator: 48000W (240V)
  • Nominal Output Voltage: 120V/240V
  • Max. Continuous AC Current: 50A @ 240V
  • Nominal AC Frequency: 50Hz/60Hz

Output AC (Off-Grid):

  • Max. Output Power: 12000W (240V)
  • Nominal Output Voltage: 120V/240V
  • Nominal Output Frequency: 50Hz/60Hz
  • Nominal Output Current: 50A @ 240V
  • Peak Power: 14kW (10 minutes) / 16kW (5 minutes) / 20kW (500ms)
  • Switching Time: Seamless

Battery Parameters:

  • Compatible Battery Type: eVault Max, eFlex, LFP-10 MAX
  • Nominal Battery Voltage: 48V
  • Battery Voltage Range: 48V-56V
  • Maximum Charging/Discharging Current: 250A
  • Maximum Charging/Discharging Power: 12000W


  • MPPT Efficiency: 99.9%
  • Max. Efficiency: 97.5%
  • CEC Efficiency: 96.5%


  • Anti-islanding Protection: YES
  • DC Switch: YES
  • Ingress Protect Degree: NEMA 4X, IP65
  • SPD Protection: YES
  • RSD: Built-in APsmart Transmitter

General Data:

  • Dimensions: 31.1 x 20.5 x 10.4 in (790 x 520 x 264 mm)
  • Weight: 127 lbs (58 kg)
  • Display: Color LCD
  • Ambient Temperature Range: -20 to 60 °C (-4 to 140 °F)
  • Cooling: FAN
  • Communication: RS485/Wi-Fi/CAN

Standard & Certification:

  • Certifications: UL1741, UL1741SB, IEEE1547A, Rule 21, ISO-NE, FCC15 class B, HECO, CEC, Luma

Warranty: 10 Years / Lead Acid or Fortress Lithium Batteries Only

Words From Our Happy Customers

Meet Our Experts

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Need help choosing the right products for your needs? Our team of highly trained experts has the knowledge and passion to help. Just pick up the phone and give us a ring. Or let's converse via live chat. We love assisting and lending a hand (or an ear).

Other shoppers asked

Does energy storage work well with my solar system?

Yes. On the grid? Absolutely! Energy storage adds a lot of value to your solar systems. It keeps your solar system operating when your utility service is interrupted. Without energy storage, your PV system will be forced to shutdown when the grid is off. If you live off grid, energy storage enables you to use the clean solar energy to power your home day and night.Fortress Power also knows you’re a fan of conservation—energy storage saves both your surplus solar energy and your cash since it reduces on grid energy dependence.

Can I use energy storage without solar panels?

Absolutely. For on grid clients, a home energy storage unit  stores energy from your electricity provider. If an outage occurs, home energy storage can provide up to 24 hours of potentially life-saving power. Need more reassurance? Fortress Power offers batteries with larger storage capabilities, completely customizable to your needs. And, like you, we appreciate saving money. When electricity is at its lowest daily rate, our smart energy storage units use that period to charge. When peak electric use occurs, our energy storage units can discharge power to suit your lifestyle.

What about power outage protection?

Power interruptions shouldn’t disrupt your schedule. An energy storage system will keep your solar system operating during grid outages. When paired with solar panels, an energy storage system supplies unlimited energy delivery. The solar panels power your home during the day and use any excess power to charge the battery. At night, the system keeps your space bright. When used without solar panels, power outage support is dependent on battery size and your energy use. Batteries providing at least 12 hours of backup power are safest.

Are home energy storage systems financially beneficial?

You can use the energy storage to shelve your peak usage. When electricity is at its lowest daily rate, our smart energy storage uses that period to charge. During the peak periods, our energy storage system can power your home, reducing your electricity bill. Clients with solar panel installations enjoy a faster return on investment.

What is Lithium batteries lifespan?

We provide a 10 year product warranty and guarantee up-to 8000 cycles, whichever comes first. Speak to our representatives for details.

Why choose Lithium Iron Phosphate over Lithium Ion batteries?

We use Lithium Iron Phosphate (LiFePo4; Lithium Ferro Phosphate) technology – the safest lithium technology in the industry. It’s environmentally friendly and can be fully recycled. While Many other competitors, such as LG Chem, Tesla and Panasonic use cobalt-based Lithium-Ion battery, which has a very poor thermal stability. Any short circuit or cell-breakage can cause thermal runaway and catch fire. And comparatively, Lithium Iron Phosphate battery deliver substantially higher amount of life cycles. We guarantee up-to 6000 cycles, while LG Chem, Tesla and Panasonic provide less than 3000 cycles.

Are Fortress Lithium batteries widely compatible?

Yes, our batteries are designed to work with all 48V chargers and hybrid inverters. We work well with Schneider, Outback, Magnum, Sol-Ark, Victron, Morningstar and so on. Please Check out our Inverter Compatibility list.

Are permits required for installation?

Legal requirements vary by location. Fortress Power’s technical support team will help you on obtaining permits.

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Nothing is more important to us than the quality of our products. Each of the manufacturers we work with have been vetted for quality, and we have personally visited manufacturing facilities to ensure high-quality production practices.

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Golden Age Hub services the 48 contiguous united states with high-quality luxury products. Our staff is entirely US-Based and our equipment ships directly out of warehouses on US soil.

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If your equipment isn’t what you expected, we make refunds and returns quick and easy. Just email and we’ll take care of you from there.

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