Fortress Power Envy 8kW 48V Storage Hybrid Inverter

The Fortress Power Envy 8kW is a robust all-in-one hybrid inverter designed for efficient residential backup and off-grid applications. As the entry-level model in the Envy “True” series, it packs 8kW of continuous power and supports up to 13kW of solar input. It integrates an inverter, 167A battery charger, and transfer switch into a compact, IP65-rated enclosure, making it a perfect match for Fortress eFlex or eForce batteries.

Why Choose Fortress Envy 8kW

The Envy 8kW is the “right-sized” solution for smaller homes, cabins, or budget-conscious homeowners who want resilience without paying for excess capacity. It offers the same advanced features as the larger 12kW model—like closed-loop communication and IP65 weatherproofing—but in a package tailored for essential load backup (fridges, lights, internet, well pump) rather than whole-home AC powering.

Benefits of Fortress Envy 8kW

• Efficient Solar Harvest: With 2 MPPT trackers capable of handling 13kW of PV, you can oversizing your solar array to keep batteries charged even during low-light winter days.

• Cost-Effective Resilience: Provides a substantial 8kW of backup power (enough for most household essentials) at a lower price point than the Envy 10kW or 12kW models.

• Built-In Safety: Comes equipped with an APsmart Rapid Shutdown transmitter, simplifying installation and saving you money on external safety hardware.

• Outdoor Ready: The rugged IP65 / NEMA 4X enclosure allows for installation on exterior walls, freeing up valuable space in your garage or utility room.

General Data

• Dimensions: 580 x 490 x 265mm (22.8 x 19.3 x 10.4 in)

• Weight: 44kg (97lbs)

• Enclosure Rating: IP65 / NEMA 4X (Outdoor Rated)

• Cooling: Active Fan Cooling

• Operating Temperature: -13°F to 140°F (-25°C to 60°C)

• Stackable: Yes (Up to 10 units)

Frequently Asked Questions

Q1: Is this powerful enough to run my whole house?

For smaller homes or cabins, yes. However, for average-to-large homes with central A/C and electric stoves, the 8kW limit may be tight. It is best suited for a sub-panel (essential loads panel) setup, whereas the Envy 12kW is designed for 200A whole-home backup.

Q2: What is the main difference between the Envy 8kW and 10kW?

They share the same physical chassis and 60A pass-through. The main difference is the power output (8kW vs 10kW) and the maximum solar input (13kW vs 15kW).

Q3: Can I use non-Fortress batteries?

Yes. The Envy 8kW works with most 48V lead-acid or lithium batteries. However, using Fortress Power batteries enables “closed-loop” communication, which improves system efficiency, safety, and warranty coverage.

Q4: Does it have a generator input?

Yes. It includes a dedicated 50A generator input (separate from the grid input) that can automatically start a standby generator to charge batteries during long outages.

Q5: Is it stackable?

Yes. You can stack up to 10 units in parallel to create a larger system if your power needs grow over time (e.g., stacking two 8kW units for 16kW of power).

If you have any questions about the item or your order, please feel free to message before purchasing. Thank you!