EG4 FlexBOSS 21 – Hybrid Inverter (120/240V Split-Phase) | 21kW PV | 3 MPPT | NEMA 4X
The EG4 FlexBOSS 21 is a split-phase hybrid inverter/charger built for high-power residential ESS, whole-home backup, and grid-interactive solar. It supports multiple MPPTs, fast transfer times, high passthrough current, and outdoor-rated installation.
Key Specifications
• Inverter Type – Hybrid
• Model – IV-16000-HYB-AW-FX-XX (XX is a number between 00–99)
• Nominal Grid Voltage (Input & Output) – 120/240 VAC; 120/208 VAC (L1,L2,N required)
• Frequency (Grid) – 60 Hz (Default) | 50 Hz
• Max Continuous Output Power – 12 kW
• Max Continuous Discharge (with PV & Grid Only) @ 25°C – 16000W @ 240V | 13800W @ 208V
• Max Continuous Discharge (without PV) @ 25°C – 12000W @ 240V | 12000W @ 208V
• Max Continuous AC Current @ 25°C – 66.7A
• Power Factor (Output) – 0.99 @ Full Load
• Peak Power – 24000W (5 sec) | 18000W (1 sec)
• Peak Power – 15000W (6 min) | 13200W (12 min)
• Max Output Fault Current – 156A
• Max Passthrough from Grid – 90A
• Backup Switching Time (Transfer Time) – 20ms (Default), 10ms (Configurable)
• THD (Voltage) – <5% at full load
• THD (Current) – <5% at full load
• Open Loop Response Time (OLRT) – <2 sec
• Time to Steady State – 10 sec
• Max AC Current – 50A @ 240V | 57.7A @ 208V
• Max AC Input Power – 12kW
• Max Continuous Line Wattage – 6000W
• Max Continuous Per-Line Wattage – 6000W
• Max Solar STC Input Power – 21kW
• Max PV Input Voltage – 600VDC
• MPPT Voltage Range – 120–440 VDC
• MPPT Full Power Voltage Range – 250–440 VDC
• Number of MPPTs / Strings per MPPT – 3 | 2 (MPPT 1) | 2 (MPPT 2) | 1 (MPPT 3)
• Max Current per MPPT – 26A (MPPT 1) | 26A (MPPT 2) | 15A (MPPT 3)
• Max Short Circuit Current Rating per MPPT – 31A (MPPT 1) | 31A (MPPT 2) | 19A (MPPT 3)
• Nominal MPPT Voltage – 360 VDC
• Load Output Minimum Voltage – >140 VDC
• Unit Startup Voltage – 100 VDC
• Compatible Battery Technologies – Lead-acid/Lithium
• Battery Operating Voltage – 40–600VDC
• Battery Nominal Voltage – 48V
• Max Charge/Discharge Current – 250ADC
• Battery Communication Protocol – CAN/RS485
• Battery → Grid/Load Efficiency – 94%
• PV → Grid/Load Efficiency – 97%
• PV → Battery Efficiency – 94.5%
• CEC Efficiency (California Energy Commission) – 96.9%
• Operating Temperature Range – -13° to 140°F (-25° to 60°C)
• Operating Humidity – 0–100% relative humidity
• Max Altitude of Operation – <6561 ft (<2000 m)
• Enclosure Rating – NEMA 4X
• Cooling – Fans
• Dimensions (H × W × D) – 30.43 × 22.28 × 11.22 in (773 × 566 × 285 mm)
• Total Weight – 121 lbs (55 kg)
• Mounting – Wall mount
• User Interface – APP/WEB/LCD (optional)
• Scalability – 10 units
• Inverter Idle Consumption @ No Load – <65W @ 25C
• Noise – <50dB @ 3 ft
• Locked Rotor Amps – 195A
• Communication Interface – RS485/CAN/Wi-Fi
• Warranty – 10 years
• Emissions – FCC Part 15, Class B
