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Fortress Power Bundle > 16kW Envy Duo 21-US Inverter, two eBoost Batteries with Guardian Monitoring System and eWay
The Fortress Power energy storage bundle combines advanced solar technology and dependable backup power into one powerful solution for modern homes.
At the heart of the system is the Fortress Power Envy Duo 21-US Hybrid Inverter, a robust 16 kW inverter capable of handling large solar arrays, and
delivering up to 12 kW of continuous backup power with exceptional efficiency and smart monitoring.
Paired with two Fortress Power eBoost 16kWh Battery units, the system provides over 32 kWh of scalable, lithium iron phosphate energy storage.
This pairing gives homeowners reliable power during outages while maximizing solar energy use.
Engineered for durability, efficiency, and seamless integration, this bundle empowers households to take control of their energy—reducing grid dependence,
lowering utility costs, and creating a resilient foundation for a cleaner, more sustainable future.
Fortress Power > 16kWh (314AH) 48 Volt LiFePO4 Home Battery
eBoost - Scalable Energy Storage System
Boost Performance. Boost Reliability
The Fortress Power eBoost is a high-capacity, modular energy storage solution built for residential and light commercial applications. With 16kWh of usable energy per unit and the ability to scale up to 512kWh,
eBoost is engineered to handle high load demands while offering the flexibility of stackable, parallel installations. Built-in heating elements, an IP65 weatherproof enclosure, and integration with the eWay wireway
system allow for clean, all-weather installs. When paired with the Envy Duo 21 or any Envy-series inverter, the eBoost forms a fully integrated, whole-home energy storage system: ideal for backup power, energy independence, and more.
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Model
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eBoost 16kwh
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Series
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eBoost
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Manufacturer
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Fortress Power
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General Data
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16 kWh
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Type
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Lithium Iron Phosphate (LiFePO4)
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Weight
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353 lbs (160 kg)
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Operating Temperature
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-4 ºF - 140 ºF (-20 ºC - 60 ºC)*
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Ingress Protect
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Degree IP65
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Communication
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PCS CAN/RS485; Parallel:CAN
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Warranty
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10 Years (up to 15 years with Fortress Power inverter and platform)
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Mounting Options
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Ground-Mount, Floor Standing, Wall-Hanged (Separate Accessory - eBoost eWay)
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Battery Specifications
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Maximum Units In Parallel
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16
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Cell Type
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Tier-1 Prismatic 16 Cell LFP (Lithium Iron Phosphate)
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Nominal Capacity
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314AH
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Nominal Energy
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16.076KWh**
** Values are based on measurements taken at 77 ºF (25 ºC) at beginning of life.
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Nominal Voltage
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51.2V
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Re-charge Voltage
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49V
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Cut-o Voltage
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41.6V
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Maximum Short-Circuit (A)
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Under Testing
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Operating Voltage Range
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41.6 - 57.6V
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Closed-Loop Charge/Discharge
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180/250 A
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Bulk/Absorption Charge
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55.2V
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Max Charge/Discharge
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314A/10s
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Surge Discharge Power W
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18kW/10s
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Cycle Life @ EOL 70%
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8000 Cycles
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Standards & Certifications
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Safety Standards
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UL1973, ANSI/CAN/UL9540:2023, UL9640A (expected Q3 2025)
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Listings
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CEC, LUMA, oGPE
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Transportation
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UN38.3
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Features
Scalable Power. Instant Impact.
- Delivers 16kWh of energy storage per unit—ideal for homes or businesses with higher load profiles or limited install space.
- Easily scale your system by connecting up to 16 units in parallel, giving you the flexibility to grow as your energy needs evolve.
- IP65-rated and equipped with internal heating elements for reliable performance in extreme conditions.
- Modular, scalable design with fast-connect hardware reduces install time and labor while maintaining a clean, professional appearance.
- Pairs with all Fortress Power Envy inverters, including the Envy Duo 21, for seamless whole-home backup and energy management.
- Built-in busbars, conduit ports, LED indicators, and an emergency shutoff make for clean, code-compliant installations with fewer external components.
Fortress Power > 16,000 Watt 48 Volt High Capacity Hybrid Inverter | 240V split-phase, 208V three-phase
Manufacturer Part Number:
Envy Duo 21-US (16kW)
Whole Home Solar hybrid inverter; Max 16KW ongrid and 12KW off-grid continous output;Max 21KW PV array; 200A transfer switch: IP 65 outdoor rated; pre-built AC &DC breakers; Built-in Apsmart RSD transmitter; 120/240V Single and split phase, 120/208V three phase, 127/220V single & split phase; 50/60HZ; breakers included
HIGH CAPACITY HYBRID INVERTER ENGINEERED
Maximum Power. Dual-Purpose Design.
The Fortress Power Envy Duo 21 is a powerful 48V hybrid inverter designed to handle demanding residential and light commercial energy needs. With a maximum PV input of 25kW and dual-phase compatibility (240V
split-phase and 208V three-phase), it delivers 12kW of continuous output power across both confi gurations, with peak outputs of 16kW (240V) and 13.8kW (208V). Perfectly matched with Fortress Power’s 48V battery
systems, the Envy Duo 21 supports multiple applications. Its integrated AC/DC breakers, rapid shutdown transmitter, and parallel scalability up to 120kW make it a versatile, future-ready solution.
Specifications
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PV Output Data
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Number of MPPT
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3
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Inputs per MPPT
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2:2:1
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Max. usable input current (A)
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26/26/15
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Max. short circuit input current (A)
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31/31/19
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Start input voltage (V)
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100
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MPPT DC nominal voltage (V)
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360
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DC voltage range (V)
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100-550
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MPPt operating voltage range (V)
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120-440
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Max. Power (W)
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21,000
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Max. PV ARRAY POWER (W)
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25,000
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Backup Output Data
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Nominal output current (A)
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50 @ 240V, 57.7 @ 208V
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Nominal output voltage (V)
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(120/240), (120/208)
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Continuous output power (VA)
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12000 @ 240V, 12000 @ 208V
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Operating frequency (Hz)
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60
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THDV
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<3%
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THDV
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<3%
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Switching Time (ms)
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<20
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AC Grid Output Data
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Max. Output Current with pv (A)
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66.7
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Max. Output Power with pv (W)
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16000 @ 240V, 13800 @ 208V
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Rated voltage (V)
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120/240, 120/208
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Operating voltage range (V)
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180 - 270
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Operating frequency (Hz)
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50 / 60
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Operating frequency range (Hz)
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55-65
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Power Factor
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0.99 @ full load
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Reactive power adjust range
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-0.8 ~ +0.8 leading adjustable
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THDI
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<3%
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Sync inrush current (A)
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35
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General Data
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Paralleling Capability
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Up to 10 units (120kW)
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Dimensions (W x H x D)
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22.3 x 35.2 x 11.2 in
(566 x 893 x 285 mm)
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Weight
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125.71 lbs (57 kg)
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Degree of protection
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NEMA4X / IP66
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Cooling concept
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Smart Cooling Fans
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Topology
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High Frequency Transformer-less
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Relative humidity
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0-100%
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Altitude (m)
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<6561ft. (<2000m)
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Operating Temperature Range (ºC)
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-25~60>40 Derating
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Noise emission (dB)
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<67
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Idle Consumption AVG (W)
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60
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Display
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Touch color screen
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Communication interface
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Rs485/ Wi-Fi/ CAN
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Efficiency
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Max. EFFICIENCY PV to grid
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97.50%
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Max. EFFICIENCY battery to grid
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94%
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CEC Efficiency
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96.9%
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Battery Data
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Type
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Lithium battery/ No Battery
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Max. charge current (A)
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250
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Max. discharge current (A)
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250
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Nominal voltage (V)
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48
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Voltage range (V)
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40 - 60
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Altitude Limitation Performance
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0 - 6561.68 feet (0-2000M)
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12kW
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6561.68 - 9842.52 feet (2000-3000M)
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10.2kW
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9842.52 - 13,123.36 feet (3000-4000M)
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8.4kW
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<13,123.36 feet (<4000M)
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Not Allowable
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* Altitude Limitation performance include max charging, discharging, active power and backup output kW.
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Safety Standards and Certifications
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Safety
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PV Reverse polarity protection; DC switch for each MPPT; Output over-voltage protection varistor; Output over current protection; PV Ground fault monitoring;
Grid monitoring; Pole sensitive leakage current Monitoring unit; AFCI; RSD; SURGE PROTECTION DEVICE (SPD): TYPE III DC PV , TYPE II AC
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Certifications
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RULE 21 PHASE I, II, III; HAWAII RULE 14H & HECO SRD-IEEE-1547.1:2020 Ed.2; IEEE 1547.1: 2020; IEEE 1547: 2018, IEEE2030.5; LUMA PR; UL1741SA, UL1741SB;
UL1741: 2021 ED3 PCS CRD; UL9540 (eFlex, eVault Max); CSA C22.2#107.1; CSA C22.2#330; FCC PART 15, CLASS B
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Warranty
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10 Years / Lead Acid, Lithium Batteries or Fortress Lithium Batteries
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Features
High Performance. Built for Growth.
- Accepts up to 25kW of PV input—ideal for large residential or small commercial solar arrays seeking maximum generation potential.
- Supports both 240V split-phase and 208V three-phase applications, making it flexible for a wide range of grid configurations.
- Parallel up to 10 units for a total output of 120kW, expanding as energy demands grow without the need for complete system redesign.
- Includes built-in AC/DC breakers and an integrated rapid shutdown transmitter for faster, code-compliant installations.
- Pairs with Fortress Power 48V batteries to deliver 12kW of continuous power and up to 16kW peak, ensuring stable, whole-home or light commercial backup.
Applications
- Backup
- Off-Grid
- Zero Export
- Time-of-Use
- Net Metering
- Virtual Power Plant
- Smart Load
- Peak Shaving
- Microgrid
Fortress Power 32kWh eBoost | Documentation
Fortress Power Envy Duo 21 | Documentation
Fortress Power Guardian | Documentation
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