Fortress Power Envy True 12kW 48V All-in-One Hybrid Inverter, 21kW Solar Input, 3 MPPTs, 200A AC Passthrough, Built-In Rapid Shutdown, IP65, UL 1741

Overview

Built for whole-home coverage, the Envy True 12kW is the top all-in-one hybrid inverter from Fortress Power. It combines a solar inverter, a 250A battery charger and a 200A transfer switch in one NEMA 4X / IP65 enclosure, with 12,000W of continuous split-phase 120/240Vac output. It suits homeowners and installers who want backup for the entire service rather than a critical loads subpanel.

Planning a system? Read our guide: How to size a battery backup system for your home.

Key benefits

• The 200A AC passthrough lets the inverter sit between the meter and the main panel, so the whole home can be backed up without choosing circuits.
• Three independent MPPT channels give flexibility for arrays on multiple roof faces, different tilts or partly shaded areas.
• A 100A auto-start generator port (90A continuous) makes it a good match for whole-home generator backup.
• It supports grid-tied, off-grid and hybrid operation from a single unit.

Key features

• 12,000W continuous split-phase 120/240Vac output
• Combined maximum PV input of 21,000W: MPPT 1 up to 12,000W with two strings, MPPTs 2 and 3 up to 7,000W each
• DC input range of 100-600Vdc, full power MPPT range of 230-500Vdc
• 200A AC passthrough, up to 48,000W from the grid to the main panel
• Auto-start generator port rated 100A max, 90A continuous, with start based on battery SOC
• 250A battery charger and 200A transfer switch in a NEMA 4X / IP65 enclosure

Ideal use

Whole-home backup systems that need to run high-demand loads such as central HVAC, electric ranges, EV chargers and workshop equipment. A strong choice where a generator is part of the backup plan.

Key specifications

Model / SKU

850079800014

Brand

Fortress Power

Category

Whole-home backup

Voltage

48V

Energy capacity

18.5 kWh

Rated power

12,000 W

From the manufacturer

About The Fortress Power Envy True 12kW The Fortress Power Envy True 12kW is the flagship model in the Fortress Power inverter lineup. It is an all-in-one hybrid inverter that combines a solar inverter, 250A battery charger, and 200A transfer switch into a single NEMA 4X / IP65 enclosure. It delivers 12,000W of continuous split-phase 120/240Vac output and supports grid-tied, off-grid, and hybrid operation. Where the Envy 8kW and 10kW models are designed for essential load backup and smaller systems, the Envy True 12kW is built for whole-home coverage, including high-demand loads like central HVAC, electric ranges, EV chargers, and workshop equipment. The defining feature of the Envy True 12kW is its 200A AC passthrough. Unlike the 8/10K models that use a backup panel approach, the True 12kW can sit between the meter and the main breaker panel, passing the full 200A service through to the entire home. When the grid goes down, the inverter takes over and powers the home from solar and batteries without requiring a separate critical loads subpanel. This simplifies system design and eliminates the need for homeowners to choose which circuits get backup power. Solar Input The Envy True 12kW has three independent MPPT channels. MPPT 1 accepts up to 12,000W with two string inputs, while MPPT 2 and MPPT 3 each accept up to 7,000W with one string input each, for a combined maximum PV input of 21,000W. The DC input voltage range spans 100-600Vdc, with a nominal input voltage of 360Vdc and a full power MPPT operating range of 230-500Vdc. Maximum DC input current is 25A on MPPT 1 and 15A each on MPPTs 2 and 3. Of the 21kW solar capacity, up to 18kW can be delivered simultaneously to the battery bank and AC outputs. The three-MPPT design provides significant flexibility for array layout. Installers can place panels on multiple roof faces, at different tilts, or in partially shaded locations without the production loss that comes from mismatched strings on a shared MPPT. The larger MPPT 1 channel is well suited for a primary south-facing array, while MPPTs 2 and 3 can handle east/west arrays or secondary panel groups independently. Grid and Generator Integration The 200A AC passthrough allows the inverter to serve as the central hub for the entire home electrical system. When the grid is available, it passes up to 48,000W (200A at 240V) directly through to the main panel. The inverter can simultaneously charge the battery bank from the grid or from solar while household loads operate normally on grid power. A dedicated auto-start generator port rated at 100A max (90A continuous) provides substantial generator integration. This is a significantly larger generator input than the 50A port on the Envy 8/10K models, making the True 12kW a better match for whole-home generator backup scenarios. The inverter can bring the generator online automatically based on battery SOC and manage the transition between grid, generator, solar, and battery power with seamless switching. For grid-tied systems, the Envy True 12kW can export up to 12,000W at 240V back to the utility. It supports time-of-use optimization, peak shaving, and zero-export modes. Demand response integration is listed as a coming feature. Battery Compatibility The Envy True 12kW operates on a 48Vdc nominal battery bus with a voltage range of 48-56Vdc. It supports a maximum charge and discharge current of 250A and a maximum charge/discharge power of 12,000W. The inverter communicates with battery management systems through closed-loop protocols for real-time monitoring of voltage, current, temperature, and SOC (State of Charge). The Envy True 12kW is compatible with Fortress Power’s eVault MAX 18.5kWh, eFlex 5.4kWh, eFlex MAX 5.4kWh, and LFP-10 MAX battery systems. Scalability A single Envy True 12kW handles most whole-home scenarios, but the inverter supports parallel operation of up to 5 units for a combined output of 60kW. Three-phase compatibility is listed as an upcoming feature. Buil

Warranty terms mentioned in this description are the manufacturer’s. Our own coverage is the 30-day limited warranty.

Before you order

We confirm compatibility, installation requirements, and delivery details with you during order review, before any payment. Home electrical work may require a qualified installer.

If you are sizing an Envy True 12kW system for your home, our team can help check array layout and battery compatibility. Message our team on WhatsApp.