Fortress Power eBoost 16kWh Lithium Battery + Envy Duo 21 Hybrid Inverter 16kW Output | DIY Solar Systems Kits
Why It’s DIY-Friendly
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Simple Installation – Easily connect the eBoost 16kWh Battery Pack and Envy Duo 21 Inverter using the eWay Conduit Box. Flexible placement options include both wall mount and floor mount brackets.
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Clean Wiring – Safe, organized cable routing with AC and DC lines physically separated inside the eWay Conduit Box for hassle-free setup.
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Safe Installation – Built-in battery and load breakers in the Envy Duo 21 inverter provide reliable system protection.
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Expandable Design – Effortlessly add more eBoost batteries via the eWay Conduit Box to grow your system as needed.
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Flexible Inputs – The Envy Duo 21 inverter supports 3 independent MPPT PV inputs and accepts both grid and generator power inputs for versatile energy sources.
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Smart Setup – Manage firmware updates and system settings easily through Guardian and the dedicated app.
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All-in-One Solution – A fully integrated system ready for both off-grid and grid-tie backup applications.
Applications
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Off-grid homes and cabins
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Home backup power
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Light commercial energy systems
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DIY solar setups
eBoost 16kWh Battery & Envy Duo 21 Hybrid Inverter Features
Your DIY Solar Power Bundle
Reliable 48V battery storage and powerful inverter supporting 240V split-phase and 208V three-phase combined in one easy-to-use system to keep your home/small business running smoothly.
🔋 High-Capacity Energy Storage & Output
The eBoost battery gives you 16kWh of energy—great for homes or businesses with higher load profiles or limited install space. Paired with the Envy Duo 21 inverter, which supports both 240V split-phase and 208V three-phase electrical setups, this bundle delivers reliable and flexible power.
✅Reliable Battery & Full-System Warranty
The eBoost battery features Tier-1 Prismatic 16 Cell LFP technology, providing over 8,000 cycles and a 10-year lifespan for dependable, long-term performance. The entire system, including the Envy Duo 21 inverter, comes with a 10-year warranty—giving you peace of mind and confidence in your energy investment.
⏱️ Time-Saving Modular Design
The modular eBoost battery with fast-connect hardware simplifies installation, saving you time and effort while keeping the whole system neat and professional-looking.
☔ Durable in Rain, Snow, or Shine
The eBoost battery is protected with a durable, weatherproof case and built-in heating elements to keep working no matter the weather or temperature.
📈 Grow Your System at Your Own Pace
Start with one eBoost 16kWh battery and Envy Duo 21 inverter, then easily expand up to 16 batteries and 10 inverters. Thanks to integration with the eWay wireway system, your installations remain clean, safe—making system upgrades simple, hassle-free, and reliable in any condition.
🛡️ Comprehensive Safety & Code Compliance
The eBoost battery features built-in busbars, conduit ports, LED indicators, and an emergency shutoff for safe, code-compliant installations. The Envy Duo 21 inverter includes built-in breakers and a rapid shutdown transmitter, ensuring fast, secure, and compliant system setup.
💵 VPP-Ready for Grid Incentives
Approved for Virtual Power Plant (VPP) programs nationwide, enabling customers to earn revenue and support grid reliability with intelligent energy discharge.
eBoost Battery & Envy Duo 21 Inverter Technical Specs & Downloads
Get the details you need—spec sheets, manuals, and performance data all in one place. We link directly to the manufacturer's site, so you know you always have the most up-to-date information.
| 16kWh | 32kWh | |
| GENERAL DATA | ||
| Weight | 353 lbs (160 kg) | 706 lbs (320 kg) |
| Operating Temperature | -4 ºF – 140 ºF (-20 ºC – 60 ºC)* | |
| Ingress Protect | Degree IP65 | |
| Communication | PCS CAN/RS485; Parallel:CAN | |
| Dimensions (W*D*H) | eWay : 22.84×10.18×9.39 in (580×258.6×238.5 mm) | Battery: 22.28×10.18×33.71 in (566×258.6×856 mm) | |
| Warranty | 10 years (up to 15 years with Fortress Power inverter and platform) | |
| Mounting Options | Ground-Mount, Floor Standing, Wall-Hanged (Separate Accessory) | |
| BATTERY SPECIFICATIONS | ||
| Maximum Units In Parallel | 16 | |
| Cell Type | Tier-1 Prismatic 16 Cell LFP | |
| Nominal Capacity | 314Ah | 2 x 314Ah |
| Nominal Energy | 16.1kWh** | 32.2kWh** |
| Nominal Voltage | 51.2V | |
| Re-charge Voltage | 49V | |
| Cut-off Voltage | 41.6V | |
| Maximum Short-Circuit (A) | Under Testing | |
| Operating Voltage Range | 41.6-57.6V | |
| Closed-Loop Charge/Discharge | 180/250 A | 360/500 A |
| Bulk/Absorption Charge | 55.2V | |
| Max Charge/Discharge | 314A/10s | 628A/10s |
| Surge Discharge Power W | 18kW/10s | 36kW/10s |
| Cycle Life @ EOL 70% | 8000 Cycles | |
| STANDARDS & CERTIFICATIONS | ||
| Safety Standards | UL1973, ANSI/CAN/UL9540:2023, UL9640A (expected Q3 2025) | |
| Listings | CEC, LUMA, oGPE | |
| Transportation | UN38.3 | |
* Performance will degrade at operating temperatures above 104 ºF (40 ºC)
** Values are based on measurements taken at 77 ºF (25 ºC) at beginning of life.
| PV Output Data | |
| Number of MPPT | 3 |
| Inputs per MPPT | 2:2:1 |
| Max. usable input current (A) | 26/26/15 |
| Max. short circuit input current (A) | 31/31/19 |
| Start input voltage (V) | 100 |
| MPPT DC nominal voltage (V) | 360 |
| DC voltage range (V) | 100-550 |
| MPPt operating voltage range (V) | 120-440 |
| Max. Power (W) | 21000 |
| Max. PV ARRAY POWER (W) | 25000 |
| Backup Output Data | |
| Nominal output current (A) | 50@240V, 57.7@208V |
| Nominal output voltage (V) | (120/240), (120/208) |
| Continuous output power (VA) | 12000@240V, 12000@208V |
| Operating frequency (Hz) | 60 & 50 |
| Peak power (VA) | 2xPn, 0.5s |
| THDV | <3% |
| Switching Time (ms) | <20 |
| General Data | |
| Paralleling Capabiliy | Up to 10 units (120kW) |
| Dimensions | 22.3 x 35.2 x 11.2 in (566 x 893 x 285 mm) |
| Weight | 125.71 lbs (57 kg) |
| Degree of protection | NEMA4X / IP66 |
| Cooling concept | Smart Cooling Fans |
| Topology | High Frequency Transformer-less |
| Relative humidity | 0-100% |
| Altitude (m) | <6561ft. (<2000m) |
| Operating Temperature Range (ºC) | -25~60>40 Derating |
| Noise emission (dB) | <67 |
| Idle Consumption AVG (W) | 60 |
| Display | Touch color screen |
| Communication interface | Rs485/ Wi-Fi/ CAN |
| AC Grid Output Data | |
| Max. Output Current with pv (A) | 66.7 |
| Max. Output Power with pv (W) | 16000@240V 13800@208V |
| Continuous power output with battery only (W) | 12000@240V, 12000@208V |
| Rated voltage (V) | 120/240, 120/208 |
| Operating voltage range (V) | 180-270 |
| Operating frequency (Hz) | 50/60 |
| Operating frequency range (Hz) | 55-65 |
| Power Factor | 0.99@full load |
| Reactive power adjust range | -0.8~+0.8 leadingAdjustable |
| THDI | <3% |
| Sync inrush current (A) | 35 |
| Efficiency | |
| Max. EFFICIENCY PV to grid | 97.50% |
| Max. EFFICIENCY battery to grid | 94% |
| CEC Efficiency | 96.90% |
| Battery Data | |
| Type | Lithium battery/ No Battery |
| Max. charge current (A) | 250 |
| Max. discharge current (A) | 250 |
| Nominal voltage (V) | 48 |
| Voltage range (V) | 40-60 |
