Fortress Power FlexTower 21.6kWh Bundle

The Fortress Power “Fully Loaded” FlexTower Bundle is the ultimate turnkey energy storage solution for whole-home backup. This premium kit combines the massive power of the Envy True 12kW Inverter with a fully maxed-out bank of four eFlex MAX batteries (21.6 kWh), all housed in the sleek, weatherproof FlexTower Enclosure.

Included in this bundle is the Guardian IoT Gateway, unlocking remote monitoring, automatic firmware updates, and extended warranty support. This is a complete, professional-grade microgrid in a box—ready to power heavy loads and keep your home running through extended outages.

Component Breakdown for FlexTower 21.6kWh

1. Envy True 12kW Inverter

• Capability: 12kW continuous AC output with a massive 200A grid pass-through.

• Solar: Industry-leading 21kW PV input (3 MPPTs) allows for large solar arrays to recharge the 21.6kWh bank quickly.

2. eFlex MAX 5.4kWh Batteries (x4)

• Capacity: Total of 420Ah / 21.6 kWh.

• Reliability: Tier 1 LFP chemistry with 8,000+ cycles.

• Thermal: Patented aluminum enclosure ensures 4x better cooling than plastic competitors.

3. FlexTower Enclosure

• Integration: Pre-wired 500A busbars and cables make connecting the 4 batteries fast and safe.

• Cooling: Active DC fans regulate internal temperature for optimal performance.

4. Guardian IoT Gateway

• Protection: Provides remote diagnostics and pushes over-the-air firmware updates to keep your system secure and efficient.

Why Choose The FlexTower 21.6kWh

This is the “no-compromise” package. While other bundles might start you with fewer batteries, this kit fills the FlexTower to its maximum capacity of 21.6 kWh right out of the gate. Paired with the Envy True 12kW’s 200A pass-through, it offers true whole-home backup capable of running central A/C, well pumps, and electric ranges. The inclusion of the Guardian Gateway ensures your investment is protected by 24/7 monitoring and qualifies you for the highest level of warranty support.

Benefits of the Fully Loaded FlexTower 21.6kWh

• Maximized Storage: With all 4 battery slots filled, you get 21.6 kWh of usable energy immediately—enough to power an average home for a full day or more without solar recharging.

• Whole-Home Resilience: The Envy True 12kW sits between the grid and your main panel, automatically transferring your entire home (up to 200A) to battery power during an outage. No sub-panels required.

• Smart & Connected: The bundled Guardian Gateway connects your system to the cloud, allowing you to track energy usage, solar production, and battery health from your smartphone.

• Aesthetic & Tough: The IP65-rated FlexTower unifies your entire system into one clean, white appliance that looks professional in a garage and is rugged enough for an outdoor concrete pad.

Frequently Asked Questions

Q1: Is this system truly “All-In-One”?

Yes. This bundle provides the inverter, storage, enclosure, and monitoring hub. It transforms a collection of parts into a single, cohesive unit. You will still need solar panels and the specific wire/conduit to connect the tower to your home’s main panel.

Q2: Why is the Guardian Gateway important?

The Guardian is critical for protecting your investment. It allows Fortress Power to remotely diagnose any issues and update your software automatically. Installing the Guardian is often a requirement to maintain the full 10-year warranty without exceptions.

Q3: Can I add more batteries to this tower later?

No. This specific bundle includes 4 batteries, which physically fills every available slot in the FlexTower enclosure. If you need more than 21.6 kWh, you would need to add a second DuraRack cabinet externally.

Q4: Can this start my Air Conditioner?

Yes. The Envy True 12kW has a 20kW surge capacity. It is capable of starting most residential 4-ton or 5-ton central A/C units (we recommend installing a “Soft Start” on the A/C for best performance).

Q5: How is this installed?

The system ships on pallets. You install the bottom cabinet (DuraRack), load the 4 batteries, stack the top cabinet (Inverter bay), mount the inverter, and make the connections using the pre-included busbars. It requires a licensed electrician to wire it into your home.

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