The Fortress Power FlexTower Bundle

Envy True 12kW and three eFlex MAX 5.4 Batteries in a FlexTower Indoor / Outdoor Enclosure

This Fortress Power Complete Energy Storage Bundle combines the massive whole-home power of the Envy True 12kW Inverter with the reliability of three eFlex MAX 5.4kWh batteries, all housed within the sleek, weatherproof FlexTower Enclosure and Guardian Gateway Battery Monitor.

This turnkey package provides 16.2 kWh of storage (expandable to 21.6 kWh) and 12kW of continuous backup power in a single, professional-looking “appliance” style unit. It eliminates the mess of external wires and separate component racks, offering a streamlined solution for indoor or outdoor installation.

Why Choose The FlexTower Bundle

This bundle is the ultimate “set it and forget it” solution for homeowners who want energy independence without sacrificing aesthetics. By combining the 200A pass-through capability of the Envy True 12kW with a pre-wired cabinet, you get a system that can back up your entire main breaker panel while looking as clean as a high-end refrigerator. With three batteries included, you have substantial storage for overnight loads, plus one empty slot in the cabinet to easily add a fourth battery later.

Component Breakdown for FlexTower Bundle

1. Envy True 12kW Inverter

• Power: 12kW continuous AC output / 200A grid pass-through.

• Solar: Supports up to 21kW of PV input (3 MPPTs).

• Surge: 20kW surge (500ms) to start heavy inductive loads like well pumps and 5-ton A/C units.

2. eFlex MAX 5.4kWh Batteries (x3)

• Chemistry: Safe, durable Lithium Iron Phosphate (LFP).

• Durability: 8,000+ cycle lifespan with a 10-year warranty.

• Efficiency: Closed-loop communication with the Envy inverter ensures precise charging.

3. FlexTower Enclosure

• Design: Combines battery racking and inverter mounting into one vertical tower.

• Pre-Wired: Includes 500A busbars and battery cables, drastically reducing installation time.

• Cooling: Thermostat-controlled fans ensure the batteries and inverter never overheat.

4. Fortress Power Battery Monitoring Gateway for eFlex MAX Batteries also included.

• The Fortress Power Guardian is a gateway device that connects Fortress Power Batteries to the cloud.
• Paired with the companion app, the Guardian will automatically discover connected Fortress Power batteries.
• Remotely update battery firmware, submit support tickets, chat live with technical support, complete warranty submissions, and securely share installation and monitoring data directly with support engineers– right from the companion app.

Frequently Asked Questions

Q1: Can I back up my whole house with this bundle?

Yes. The Envy True 12kW has a 200A pass-through, meaning it sits between your utility meter and your main panel. If the grid goes down, it disconnects and powers the whole panel. Just be mindful that 16.2 kWh of battery will drain faster if you run heavy appliances like electric heat or dryers continuously.

Q2: Can I add more batteries later?

Yes. This bundle includes 3 batteries, but the FlexTower enclosure has physical slots for 4. You can purchase one additional eFlex MAX 5.4kWh later and simply slide it into the empty bottom slot to reach the maximum 21.6 kWh capacity.

Q3: Do I need to buy extra cables?

The FlexTower enclosure comes pre-wired with the main DC busbars and battery-to-busbar cables. However, you will still need the appropriate wire to connect the inverter to your main electrical panel and solar array.

Q4: Where can I install this tower?

The entire system is IP65 rated, so it can be installed indoors (garage, basement) or outdoors (side of the house, concrete pad). It requires a solid, level surface capable of supporting over 600 lbs.

Q5: How does the system stay cool?

The FlexTower features an integrated active cooling system. A 48V fan runs off the battery power and turns on automatically when the temperature inside the cabinet rises, venting heat out to protect the electronics.

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