Fortress Power Envy True 12kW Inverter
Fortress Power Envy True 12kW Inverter
Fortress Power Envy True 12kW Inverter

Fortress Power Envy True 12kW Inverter


Regular price$6,259.00

FREE Shipping + 0% Sales Tax

  • In stock, ready to ship
  • Inventory on the way
  • Estimated arrival 4-10 days after placing the order. Please call or message the chat for precise ETAs
  • Free shipping, Lowest prices, No sales tax, Exceptions apply
  • We beat the competitor's price. Call or send a message NOW! 855-601-2444

Fortress Power Envy True 12kW Inverter

12kW Whole Home Solar Storage Inverter

The Fortress Power Envy True 12 – a whole-home, all-in-one 12kW inverter solution. Paired with the Fortress Power eFlex 5.4 kWh or the eVault MAX 18.5 kWh batteries, the Envy features a 200A AC passthrough providing up to 12kW (50A @ 240V) of whole-home backup power.

The Envy features a built-in generator input with AC/DC coupling, on- and off-grid capabilities, plus a 3 MPPT output allowing for a maximum of 21 kW PV array.

The Envy is equipped with a built-in APsmart Module Level Rapid Shutdown Transmitter and Button, along with Pre-built AC & DC breakers allowing for fast installation and commissioning. Use our online monitoring app to access your system from anywhere.

Key Features:

  • 200A AC Passthrough current for whole home backup
  • 3MPPT Output for max 21kW PV Array
  • AC / DC Coupling
  • IP65 rated for indoor & outdoor installation
  • Built-in generator port
  • 5 units in parallel
  • Online monitoring/app
  • Color LCD touch screen
  • 3 Phase compatible (Upcoming Feature)

Supported Applications:

  • Backup
  • Off-Grid
  • Zero Export
  • Time-of-Use
  • Peak Shaving
  • Demand Response Integration (coming soon)


Whole-Home Backup One-Line Diagram




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




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.

We also know 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.

Do I receive incentives on my energy storage system?
If your energy storage is powered by solar panels, you are eligible for 26% federal tax credit. Many states and utilities provide rebates for homes and businesses with energy storage systems, aiming for grid resilience.

What is Lithium batteries lifespan?
We provide a 10 year product warranty and guarantee up-to 6000 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, these 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.



We provide a 10 year product warranty and guarantee up-to 6000 cycles, whichever comes first.

Have a Question?

Talk to one of our trusted experts today! Our customer support team would love to answer any questions you might have. Call us if you want to place the order over the phone (855) 601-2444 or send us your inquiry via chat.