The Fortress Power FlexTower Top Enclosure is a heavy-duty, IP65/NEMA 3R rated outdoor enclosure engineered to securely house the Fortress Power Envy 8kW, 10kW, or 12kW inverter as the top section of the FlexTower all-in-one energy storage tower system, delivering a clean, weatherproof, and professional inverter installation for both indoor and outdoor applications.

Key Features:

• IP65 and NEMA 3R Rated for Indoor and Outdoor Use: Fully sealed against dust and water ingress and NEMA 3R certified for outdoor exposure, the FlexTower Top Enclosure protects the Envy inverter in the harshest installation environments with confidence.
• Purpose-Built to House Envy 8kW, 10kW, and 12kW Inverters: Precision-engineered to accommodate the full Fortress Power Envy inverter lineup, ensuring a secure, clean, and professional fit every time without modification.
• Pre-Sized Side Knockouts for Solar, Grid, and Generator Wiring: Factory-installed side knockouts sized specifically for solar, grid, and generator conduit runs save significant time on inverter wiring and eliminate the need for field drilling or custom conduit work.
• Integrates Directly with the DuraRack Bottom Enclosure: Designed to sit on top of the DuraRack battery cabinet, the FlexTower Top Enclosure completes the full FlexTower system — combining the inverter and up to four eFlex or eFlex MAX batteries into a single cohesive energy storage tower.
• Carbon Steel Construction with Integrated Inverter Mounting Hardware: Built from heavy-duty carbon steel with factory-prepared inverter mounting points, delivering a rigid, stable, and long-lasting enclosure that supports the full weight of the Envy inverter securely.

The Fortress Power FlexTower Top Enclosure is the professional finishing piece for any FlexTower system build. By housing the Envy inverter in a fully sealed, outdoor-rated enclosure directly above the DuraRack battery cabinet, installers create a single, space-efficient energy tower that eliminates separate wall mounting, external wiring runs, and additional enclosures — dramatically reducing installation time, material costs, and system complexity on every job.

Compatible with the Fortress Power Envy 8kW, 10kW, and 12kW inverters and designed to pair directly with the DuraRack bottom enclosure, the FlexTower Top Enclosure supports every FlexTower application including off-grid, backup, zero export, time-of-use, demand response, peak shaving, and virtual power plant participation. The inverter is not included — this listing is for the enclosure only.

Technical Specifications