Illustration of the product type, not this exact unit
Hybrid inverter
EG4 FlexBOSS21: specs and datasheet
- UL 3141
- UL 1741
FlexBOSS21 delivers 12 kW on battery alone and 16 kW with PV and grid at 25 °C, with three MPPTs and up to 21 kW of recommended solar. It is built around 51.2 V batteries, and its datasheet recommends at least 600 Ah of battery per inverter, a bigger bank than the other inverters that list a minimum. Peak power reaches 24,000 W for half a second. It is rated NEMA 4X and carries a 10-year warranty.
- Output
- 12 kW (50 A), battery only
- Battery
- 51.2 VDC
- Solar input
- 21 kW
- MPPTs
- 3
- Warranty
- 10 years
About the FlexBOSS21
FlexBOSS21 delivers 12 kW on battery alone and 16 kW with PV and grid at 25 °C, with three MPPTs and up to 21 kW of recommended solar. It is built around 51.2 V batteries, and its datasheet recommends at least 600 Ah of battery per inverter, a bigger bank than the other inverters that list a minimum. Peak power reaches 24,000 W for half a second. It is rated NEMA 4X and carries a 10-year warranty.
In one line An inverter turns the DC power from solar panels and batteries into the AC power household appliances use.
Key features · as listed by the maker
- Scales from small to large systems, 50 to 160 A
- Starts a 5-ton AC unit easily
- EMP-hardened, per the maker
- With GridBOSS: AC coupling, smart loads and generator support
How power moves
- Up to 21.0 kW of PV (recommended max)
- 51.2 V battery bank
- 12.0 kW continuous to your loads
Schematic only: it shows the direction of flow in each situation, not measured values. Wiring and code requirements are in the maker’s manual and your local code.
Use it in a calculation
Compare
Specifications
- Model number
- IV-16000-HYB-AW-FX-XX
- Continuous output
- 12 kW (50 A), battery only
- Continuous output with PV and grid (at 25 °C)
- 16 kW (66.7 A)
- Peak power
- 0.5 s: 24,000 W · 1 s: 18,000 W · 6 min: 15,000 W · 12 min: 13,200 W
- Battery voltage (nominal)
- 51.2 VDC
- Max battery charge current
- 250 A
- Max DC input voltage
- 600 VDC
- MPPT voltage high protection (inverter faults here; plan strings below it)
- 550 VDC
- MPPT full-power voltage range
- 250 – 440 VDC (operating range 120 – 440 VDC)
- Number of MPPTs
- 3
- Rated PV current per MPPT
- 26 A (MPPT 1) | 26 A (MPPT 2) | 15 A (MPPT 3)
- Recommended max solar array power (STC)
- 21 kW
- Recommended minimum battery capacity per inverter
- 600 Ah
- Idle consumption (standby)
- <65 W @ 25 °C
- Efficiency, battery to grid/load (max)
- 94%
- Max inverters in parallel
- 16
- Warranty (as listed)
- 10 years
- Enclosure rating
- NEMA 4X
- Weight
- 121 lbs (55 kg)
- Dimensions (H×W×D)
- 30.43×22.28×11.22 in (773×566×285 mm)
Each value is the datasheet line as printed (hover or long-press a value to see that line). A missing row means the datasheet does not list it. Specs change with new revisions: check the current datasheet (linked above) before you buy.
Documents and links
- Datasheet: EG4 FlexBoss21 Spec Sheet PDF, from the maker
- Datasheet: EG4 FlexBoss21 Spec Sheet PDF, from the maker
- Maker’s product page (EG4 Electronics)
Not affiliated with Signature Solar LLC or EG4 Electronics. Trademarks belong to their owners.