Envy 12kW 1-Phase Energy Storage System – 4 eFlex 5.4 G2 Modules, DuraRack - Envy12KW4-DuraRack
Envy 12kW 1-Phase Energy Storage System – 4 eFlex 5.4 G2 Modules, DuraRack - Envy12KW4-DuraRack
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- SKU
- PES-SPS-SIV-0789
- MPN
- Envy12KW4-DuraRack
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Fortress Envy12kW + (4) eFlex 5.4 kWh G2 + DuraRack Enclosure
SKU/MPN: Envy12KW 4-DuraRack • Application: Whole-home backup / grid-tied with storage • Chemistry: LiFePO4 (48 V)
What’s included
- 1× Envy True 12 kW Hybrid Inverter — 200 A AC passthrough; up to 21 kW PV (3 MPPT); AC/DC coupling; generator input; NEMA 4X/IP65; 34.2 × 20.5 × 11.2 in; 127 lb.
- 4× eFlex 5.4 kWh Batteries (G2) — 51.2 V, 105 Ah LFP; IP65; 18 × 23 × 7.3 in; 108 lb each.
- 1× DuraRack Enclosure — outdoor-rated cabinet for up to four eFlex/eFlex MAX; integrated busbars and battery cables; 29.88 × 41.97 × 17.83 in; 153.2 lb.
Highlights
- ~21.6 kWh usable storage (4 × 5.4 kWh) with modular expansion options on additional racks.
- Hybrid flexibility: Works with new or existing PV via AC or DC coupling; fast transfer (<20 ms) for backup.
- Closed-loop integration: CAN/RS-485 comms between Envy and Fortress batteries for optimized charging and warranty compliance.
- Outdoor-ready hardware: Envy NEMA 4X/IP65; eFlex IP65; DuraRack IP65 (indoor/outdoor).
Key specs
| Inverter Output | 12 kW continuous; 120/240 V split-phase (10.4 kW @ 120/208 V); transfer < 20 ms |
|---|---|
| PV Input | Up to 21,000 W across 3 MPPTs (2/1/1 strings) |
| Total Energy | ≈21.6 kWh (4 × 5.4 kWh eFlex) |
| Enclosures | Envy: NEMA 4X/IP65 • eFlex: IP65 • DuraRack: IP65 |
| Primary Enclosure Size | DuraRack 29.88 W × 41.97 H × 17.83 D in (cabinet footprint) |
| Approx. Combined Weight | ≈712 lb (Envy 127 + 4× eFlex 108 + DuraRack 153.2) |
| Certifications | Envy: UL1741/UL1741SB, IEEE 1547A • eFlex: UL9540, UL1973, UL9540A • DuraRack: IP65 cabinet; DuraRack + eFlex listed in UL9540/9540A documentation |
Specifications from Fortress Power datasheets and manuals. Always size conductors/OCPD, provide clearances, and commission per the installation manual and local code/AHJ requirements.
| SKU | PES-SPS-SIV-0789 |
|---|---|
| MPN | Envy12KW4-DuraRack |
| Manufacturer | Fortress Power |
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