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Description
Fortress Power Envy Duo 21 Hybrid Inverter | 48V | 25kW PV Input | 12kW Backup | 240V Split-Phase & 208V 3-Phase | Parallel to 120kW | 10-Year WarrantyPower larger solar + storage systems with the Fortress Power Envy Duo 21, a high capacity 48V hybrid inverter built for demanding residential and light commercial energy needs. With up to 25kW PV input, dual voltage compatibility (240V split phase 208V three phase), and scalable paralleling up to 120kW, its a future ready solution for backup power, off grid setups, zero export, TOU optimization, and more. Key Features & Benefits: High PV input
Power larger solar + storage systems with the Fortress Power Envy Duo 21, a high-capacity 48V hybrid inverter built for demanding residential and light commercial energy needs. With up to 25kW PV input, dual-voltage compatibility (240V split-phase / 208V three-phase), and scalable paralleling up to 120kW, it’s a future-ready solution for backup power, off-grid setups, zero-export, TOU optimization, and more.
Key Features & Benefits:
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High PV input capacity: Supports up to 25kW PV array power for larger residential or light commercial solar arrays
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Dual voltage compatibility: Works with 120/240V split-phase and 120/208V three-phase configurations
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Reliable backup output: 12,000W continuous backup power (240V or 208V) with <20ms switching time
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Higher grid output with PV: Up to 16,000W @ 240V (or 13,800W @ 208V) when PV is available
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Seamless battery integration: Designed to pair with Fortress Power 48V batteries (40–60V range) for stable backup performance
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Scalable system design: Parallel up to 10 units (120kW total) to expand as energy demands grow
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Install-friendly, code-compliant hardware: Built-in AC/DC breakers + integrated rapid shutdown transmitter
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Remote monitoring + updates: Monitor production/consumption and perform remote firmware updates via Fortress Power mobile app (where supported)
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Built for tough environments: NEMA 4X / IP66 enclosure, smart cooling fans, and touch color display
Quick Specs:
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MPPTs: 3 (inputs per MPPT: 2:2:1)
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Max PV Array Power: 25,000W | Max PV Power: 21,000W
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Continuous Output (Battery Only): 12,000W @ 240V or 208V
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Max Output w/ PV: 16,000W @ 240V | 13,800W @ 208V
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Efficiency: 97.5% max PV-to-grid | 96.9% CEC
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Comms: RS485 / Wi-Fi / CAN
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Size / Weight: 22.3 x 35.2 x 11.2 in | 125.71 lb
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Warranty: 10 Years
What’s in the Box (Unboxing):
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1 x Envy inverter with hole knockout caps
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1 x Wall mount bracket
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2 x L-shaped braces
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1 x Battery RJ45 adapter
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1 x Installation/User manual
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2 x Current transformers (CT) (connected by one cable)
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1 x Dongle
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2 x Battery-to-inverter comm cable + inverter-to-inverter comm cable
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4 x RJ45 terminals
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6 x Mounting screws (wood)
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6 x expansion screws
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4 x Cross head screws: L-brace + dongle
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1 x Knockout hole template
User Manual / Documents:
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy