Fortress Power Envy Duo 21 16kW Whole Home Solar Hybrid Inverter Envy Duo 21-US (16KW)
MPN No: Envy Duo 21-US (16KW)
Expected ship date Nov 26 - Dec 03
In Stock
5,398.00
-6%
$5,065.00
Sale
Fortress Power Envy Duo 21 16kW Whole Home Solar Hybrid Inverter Envy Duo 21-US (16KW)
Fortress Power Envy Duo 21 16kW Whole Home Solar Hybrid Inverter Envy Duo 21-US (16KW)
Regular price
$5,398.00
-6%
$5,065
6% OFF
LESS THAN 50
Sale
Fortress Power Envy Duo 21 16kW Whole Home Solar Hybrid Inverter Envy Duo 21-US (16KW)
Fortress Power Envy Duo 21 16kW Whole Home Solar Hybrid Inverter Envy Duo 21-US (16KW)
In Stock
MPN No: Envy Duo 21-US (16KW)
Regular price
$5,398.00
-6%
$5,065
Expected ship date Nov 26 - Dec 03
We offer multiple secure payment options for your convenience
We offer multiple secure payment options for your convenience
Data Sheet
Regular price
$5,398.00
-6%
$5,065
Fortress Power Envy Duo 21 16kW Whole Home Solar Hybrid Inverter Envy Duo 21-US (16KW)
MPN No:
Envy Duo 21-US (16KW)
Expected ship date Nov 26 - Dec 03
In Stock
Sale
Fortress Power Envy Duo 21 16kW Whole Home Solar Hybrid Inverter Envy Duo 21-US (16kW)
Compatible products:
Fortress eFlex Max 5.4 kWh 51.2V Battery
Fortress Power 16kWh eBoost LFP Battery
Unmatched power and versatility for residential and commercial solar applications.
The Fortress Power Envy Duo 21 is a next-generation hybrid inverter engineered to handle whole-home energy needs with built-in reliability, scalability, and advanced safety features. Whether you’re on-grid, off-grid, or using a hybrid setup, this inverter delivers exceptional performance in all conditions.
Key Benefits
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Massive Power Handling – Supports up to 16kW continuous on-grid output and 12kW continuous off-grid output.
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High PV Input Capacity – Connect up to a 21kW solar PV array for maximum energy harvest.
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Whole-Home Backup – Built-in 200A transfer switch seamlessly powers critical and non-critical loads during outages.
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Flexible Voltage & Phases – Compatible with 120/240V single & split phase, 120/208V three phase, and 127/220V single & split phase at 50/60Hz.
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Outdoor-Ready – Rugged IP65 weatherproof rating ensures safe installation indoors or outdoors.
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Pre-Configured Safety – Comes with pre-built AC & DC breakers included for streamlined installation.
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Built-in RSD Compliance – Equipped with an APsmart rapid shutdown transmitter for NEC 690.12 compliance.
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Smart Design – Pre-integrated components reduce install time and simplify system wiring.
Special Technology
3× MPPT Architecture: Inputs per tracker (2:2:1) with wide 100–550 V DC range enable flexible stringing.
Fast Transfer: <20 ms switchover helps keep critical loads online during grid events.
Advanced Protection: AFCI, RSD, PV ground-fault monitoring, surge protection (DC Type III / AC Type II), anti-islanding.
Warranty
10-Year Manufacturer Warranty.
Best Uses
Whole-Home Backup & TOU Shifting: Seamless PV + battery operation with generator-ready capability.
Light Commercial / Microgrids: Parallel stacks up to 120 kW with flexible 208/240 V deployments.
Specifications Table
| Specification | Data |
|---|---|
| Model | Envy Duo 21-US (16 kW) |
| PV Max / Recommended Max | 25,000 W / 21,000 W |
| MPPTs / Inputs per MPPT | 3 / 2:2:1 |
| DC Voltage Range / MPPT Range | 100–550 Vdc / 120–440 Vdc |
| Start Voltage / MPPT Nominal | 100 Vdc / 360 Vdc |
| Max Usable Input Current (A) | 26 / 26 / 15 |
| Max Short-Circuit Current (A) | 31 / 31 / 19 |
| AC Grid Output | |
| Grid Voltages | 120/240 Vac split-phase; 120/208 Vac 3-phase |
| Max Output Power with PV | 16,000 W @ 240 V; 13,800 W @ 208 V |
| Continuous (Battery-Only) | 12,000 W @ 240 V / 208 V |
| Max Output Current (PV assist) | 66.7 A |
| Frequency / Range | 50/60 Hz / 55–65 Hz |
| Power Factor / THDi | 0.99 @ full load / <3% |
| Backup Output | |
| Nominal Output | 120/240 V or 120/208 V |
| Continuous Power / Peak | 12,000 VA / 2× Pn for 0.5 s |
| Switching Time | <20 ms |
| THDv | <3% |
| Efficiency | |
| PV→Grid / Battery→Grid | 97.5% / 94% |
| CEC Weighted | 96.9% |
| Battery | |
| Nominal / Range | 48 V / 40–60 V |
| Max Charge / Discharge Current | 250 A / 250 A |
| General | |
| Paralleling | Up to 10 units (120 kW total) |
| Enclosure | NEMA 4X / IP66 |
| Dimensions (W × H × D) | 22.3 × 35.2 × 11.2 in |
| Weight | 125.71 lb |
| Cooling | Smart cooling fans |
| Operating Temp | −25 °C to +60 °C (derate >40 °C) |
| Altitude / Humidity | < 6561 ft (2000 m) / 0–100% RH |
| Noise | < 67 dB |
| Idle Consumption | ~60 W |
| Display / Comms | Touch color screen / RS485, Wi-Fi, CAN |
| Safety & Certifications | AFCI, RSD, GFDI; UL1741 SA/SB, UL9540 (with Fortress batteries), IEEE 1547/1547.1, Rule 21, HECO 14H, FCC Part 15 Class B |
| Warranty | 10 Years |
About Fortress:
FAQ
Shipping costs at US Solar Supplier are calculated based on the weight and dimensions of the product(s) in your order. The company utilizes FedEx or UPS for ground shipments and trusted freight carriers for larger shipments. All shipments are insured for customer protection.
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US Solar Supplier offers only the best Tier 1 product offerings and high-quality solar equipment. You can design your solar project using the solar design tool, tailored to fit your needs. If you have specific preferences or deadlines, include this information in the order notes or contact the sales department before placing your order. US Solar Supplier is committed to empowering you with the tools and support needed to ensure your project's success.
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