Fortress Power Envy 12kW and 4 eFlex 5.4 G2 Envy12KW4
Fortress Power Envy 12kW and 4 eFlex 5.4 G2 Envy12KW4
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$18,125.95 USD
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$18,125.95 USD
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- SKU
- PES-SPS-SIV-0791
- MPN
- Envy12KW4
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Fortress Power
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Fortress Envy 12 kW + (4) eFlex 5.4 kWh G2 — 21.6 kWh LFP Bundle
SKU/MPN: Envy12KW4 • 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; 3 MPPT (up to 21 kW PV); AC/DC coupling; generator input; NEMA 4X/IP65; 34.2 × 20.5 × 11.2 in; 127 lb. [Datasheet / Manual]
- 4× eFlex 5.4 kWh G2 Batteries — 51.2 V, 105 Ah LFP; IP65 enclosure; ≈18 × 23 × 7.3 in; 108 lb each. Closed-loop inverter comms. [Datasheet]
Why this bundle
- ~21.6 kWh total usable storage (4 × 5.4 kWh modules) with modular wiring and mounting.
- Hybrid flexibility: Works with new or existing PV via AC or DC coupling; fast transfer; generator-ready.
- Closed-loop integration: CAN/RS-485 communication between Envy and Fortress batteries optimizes safety and performance.
- Outdoor-ready hardware: Envy NEMA 4X/IP65; eFlex IP65 for indoor/outdoor installs.
- Code & utility ready: Envy carries UL1741SB/IEEE 1547; eFlex carries UL9540/1973/9540A with UN38.3 shipping classification.
Key specs
| Inverter Output | 12 kW continuous; 120/240 V split-phase (also 120/208 V capable; see manual) |
|---|---|
| PV Input | Up to 21,000 W across 3 MPPTs (2/1/1 strings) |
| Total Energy | ≈21.6 kWh (4 × 5.4 kWh eFlex G2) |
| Enclosures | Envy NEMA 4X/IP65 • eFlex IP65 |
| Primary Enclosure Size | Envy 34.2 H × 20.5 W × 11.2 D in |
| Approx. Combined Weight | ≈559 lb (Envy + four eFlex) |
| Certifications | Envy: UL1741SB • eFlex: UL9540, UL1973, UL9540A |
Specifications from Fortress Power datasheets and manuals. Always size conductors/OCPD, provide clearances, and commission per the installation manual and local code.
| SKU | PES-SPS-SIV-0791 |
|---|---|
| MPN | Envy12KW4 |
| Manufacturer | Fortress Power |
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Specifications
Datasheet
Capacity Kwh
5.4
Capacity Ah
105
Voltage
51.2V
Chemistry
LFP (Lithium Iron Phosphate)
Depth Of Discharge
Up to 95%
Cycle Life
8000 @ 80% DoD
Certifications<