EG4 EG4 FlexBOSS21

Official manufacturer NA verified Sept. 25, 2026

Unresolved safety-relevant conflict
Two sources give different figures for a value on this product and nobody has resolved it. The specifications below are shown as recorded, but this product must not be treated as verified for engineering purposes until the conflict is closed.

Identity

category	inverters
ean	—
firmware	{'documented_version': 'UNKNOWN', 'constraints': 'UNKNOWN'}
generation	—
manufacturer	EG4
market_version	NA (UL 1741 / split-phase 120/240 VAC)
model	EG4 FlexBOSS21
mpn	IV-16000-HYB-AW-FX-XX
product_family	FlexBOSS
product_status	—
region	—
release_year	—
series	FlexBOSS
sku	IV-16000-HYB-AW-FX-XX

Electrical

ac_connection	1ø
ac_voltage_range	—
battery_capacity_range_kwh	—
battery_communication	—
battery_max_charge_current_a	250
battery_max_charge_power_w	—
battery_max_discharge_current_a	250
battery_max_discharge_power_w	—
battery_nominal_battery_voltage_v	51.2
battery_nominal_voltage_v	51.2 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
battery_supported	True EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
battery_type	—
battery_voltage_max_v	60 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
battery_voltage_min_v	40 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
battery_voltage_range_v	40 - 60 VDC
cec_weighted_efficiency_pct	97
eps_peak_power	24000W (.5 sec) \| 18000W (1 sec) \| 15000W (6 min) \| 13200W (12 min)
eps_phase	—
eps_rated_power_va	—
eps_switchover_time_ms	20ms (Default), 10ms (Configurable)
eps_voltage	—
european_efficiency_pct	—
external_transfer_switch_required	—
frequency_range_hz	50/60Hz
inrush_current	—
max_ac_active_power_w	16kW (rated continuous); 12kW (battery only)
max_ac_current_a	66.7
max_ac_power_w	16000 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
max_apparent_power_va	16000
max_backfeed_current_a	—
max_charge_current_a	250 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
max_dc_input_power_w	21000
max_dc_voltage_v	600
max_discharge_current_a	250 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
max_efficiency_pct	97
max_input_current_per_mppt_a	26A (MPPT 1) \| 26A (MPPT 2) \| 15A (MPPT 3) disputed
max_output_fault_current_a	—
max_pass_through_current_a	90
max_pv_input_voltage_v	600 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
max_short_circuit_current_per_mppt_a	31A (MPPT 1) \| 31A (MPPT 2) \| 19A (MPPT 3) disputed
mppt_efficiency_pct	—
mppt_voltage_max_v	440 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
mppt_voltage_min_v	120 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
mppt_voltage_range_v	250 - 440 VDC (full power)
night_self_consumption_w	—
nominal_ac_voltage	120/240 or 208 VAC
nominal_dc_voltage_v	—
nominal_frequency_hz	—
nominal_grid_voltage_v	['120/240', '120/208'] EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
number_of_mppt	3 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
official_manual_url	https://eg4electronics.com/wp-content/uploads/2024/08/FlexBOSS-21-Manual.pdf EG4 FlexBOSS21 product page
official_product_url	https://eg4electronics.com/categories/inverters/eg4-flexboss-21/ EG4 FlexBOSS21 product page
parallel_capability	16
phase_count	1 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
power_factor_range	—
product_status	active EG4 FlexBOSS21 product page
rated_ac_power_w	16000
rated_mppt_voltage_range_v	—
startup_voltage_v	200 EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
strings_per_mppt	2 (MPPT 1) / 2 (MPPT 2) / 1 (MPPT 3)
strings_per_mppt_distribution	[2, 2, 1] EG4 FlexBOSS21 Hybrid Inverter Spec Sheet
thd_pct	—

Physical / mechanical

ac_terminal	—
cooling	—
dc_connector	—
depth_mm	285
dimensions_mm	773 x 566 x 285
display	—
enclosure_material	—
height_mm	773
mounting	—
noise_db	—
weight_kg	55
width_mm	566

Installation

cable_requirements	—
commissioning	—
installation_angle	—
mounting_clearances	—
torque	—

Environment

ingress_protection	NEMA 4X
max_altitude_m	—
operating_temperature_c	-25° - 60°C
pollution_degree	—
protective_class	—
relative_humidity_pct	—
storage_temperature_c	—

Interfaces & connectors

app	—
communication	['Wi-Fi', 'Cellular', 'Ethernet']
dry_contact	—
meter_interface	—
monitoring_portal	—
protocols	[]

Protection

anti_islanding	—
arc_fault	—
dc_switch	—
insulation_monitoring	—
overvoltage_category	—
rcmu	—
reverse_polarity	—
surge_protection_ac	—
surge_protection_dc	—

Warranty & service

conditions	—
extension_options	—
standard_years	10

Documents

datasheet EG4 FlexBOSS21 Hybrid Inverter Spec Sheet rev UNKNOWN

installation_manual EG4 FlexBOSS21 Hybrid Inverter User Manual, Version 1.3.7 (model IV-16000-HYB-AW-FX-XX)

product_page EG4 FlexBOSS21 product page

Recorded conflicts

electrical.max_short_circuit_current_per_mppt_a Review required

31A (MPPT 1) | 31A (MPPT 2) | 19A (MPPT 3) — stored value

[31, 31, 19] — SHORT-CIRCUIT CURRENT RATING PER MPPT 31A (MPPT 1) | 31A (MPPT 2) | 19A (MPPT 3) — axis: MPPT

Detected during import v1-freeze-2026-09-batch07

electrical.max_input_current_per_mppt_a Review required

26A (MPPT 1) | 26A (MPPT 2) | 15A (MPPT 3) — stored value

[26, 26, 15] — RATED CURRENT PER MPPT 26A (MPPT 1) | 26A (MPPT 2) | 15A (MPPT 3) — axis: MPPT

Detected during import v1-freeze-2026-09-batch07

electrical.max_ac_current_a Resolved — accepted incoming value

66.7A (rated continuous) | 50A (battery only) — stored value

66.7 — MAX. CONTINUOUS OUTPUT 66.7A | 16kW

Detected during import v1-freeze-2026-09-batch07

Additional documented parameters

Recorded verbatim from the source; no schema field exists for these yet.

CEC WEIGHTED EFFICIENCY	97%
MAX. APPARENT POWER WITH BATTERY	12kVA
NOMINAL VOLTAGE	51.2 VDC
RATED CURRENT PER MPPT	26A (MPPT 1) \| 26A (MPPT 2) \| 15A (MPPT 3)
SHORT-CIRCUIT CURRENT RATING PER MPPT	31A (MPPT 1) \| 31A (MPPT 2) \| 19A (MPPT 3)
battery.communication	UNKNOWN
battery.max_charge_current_a	250
battery.max_charge_power_w	UNKNOWN
battery.max_discharge_current_a	250
battery.max_discharge_power_w	UNKNOWN
battery.nominal_battery_voltage_v	51.2
builder_completeness	partial

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