EG4 FlexBOSS18 48V Split-Phase Hybrid Inverter
A 48 V split-phase hybrid inverter rated 10,000 W from battery alone, with two MPPT inputs taking up to 18 kW of solar, an outdoor NEMA 4X case and a Wi-Fi dongle in the box.
$3,200
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Usability
7.0 out of 10It suits a buyer who wants 10 kW of 120/240 V power from batteries and a large solar array on one outdoor-rated unit, and who will not need a generator input without adding the GridBOSS or a published no-load draw.
Strengths
- 10,000 W continuous from battery alone
- 120/240 V split phase from one unit
- 18 kW PV on 2 MPPTs600 V max
- NEMA 4X enclosure for outdoor mounting
- Wi-Fi dongle and EG4 app included
Drawbacks
- No generator input without the GridBOSS
- Only a standby idle figureunder 60 W, is published
- Spec sheet says 11 kW grid inputmanual says 10 kW
- Spec sheet allows 16 in parallelstore page says 10
- Grid export and Rule 21 modes an off-grid buyer pays for
Specs
- CapacityNot applicable
- AC Output6,000 W or more
- System Voltage48 V
- Panel PowerNot applicable
- Safety ListingCSA 107.1 listed, UL 1741 listed
- Cell TypeNot applicable
- Low-Temp ChargingNot applicable
- Warranty10 Years
- MonitoringWired display or port only
- Weight115.0 lb
Not published by EG4: charge current.
At a glance
- 30.4 x 22.3 x 11.2 in case
- 90 A grid pass-through
- 195 A locked rotor amps
- 250 A battery breaker
EG4 is the brand of EG4 Electronics LLC of Sulphur Springs, Texas, part of Energy Access Innovations with its sister company Signature Solar.
It sells with a cart through Signature Solar at signaturesolar.com and through approved distributors and dealers such as Current Connected, Shop Solar and BigBattery, while eg4electronics.com has no cart.
The EG4 FlexBOSS18, model IV-13000-HYB-AW-FX-XX (XX from 00 to 99), is a 48 V high-frequency, transformerless hybrid inverter that EG4's spec sheet says is capable of running entirely off grid, and that its manual says is able to operate on and off the grid. It is rated 10,000 W (41.67 A) continuous from battery alone and 13,000 W continuous with PV and grid at 25 °C, at 120/240 V split phase or 120/208 V, 5,000 W per leg, with peak ratings of 20,000 W for 0.5 s, 15,000 W for 1 s, 13,500 W for 1 minute, 12,500 W for 6 minutes and 11,000 W for 12 minutes, 195 locked rotor amps and 90 A of grid pass-through. Solar input is two MPPT trackers of 26 A each, 600 V maximum, a 120-440 V operating range (250-440 V at full power) and an 18 kW recommended array. The battery side is 51.2 V nominal (40-60 V) with 208 A maximum charge and discharge current, CAN and RS485 closed-loop communication and a 250 A battery breaker. EG4 rates battery-to-load efficiency at 94%, PV-to-load at 97% and CEC weighted efficiency at 97%, standby idle consumption under 60 W, and a transfer time of 20 ms by default or 10 ms when configured. A Wi-Fi dongle is included for the EG4 app and web monitoring; a screen kit is optional. Generator, smart-load and AC-coupling functions come with EG4's GridBOSS. It has a NEMA 4X enclosure, runs from -25 to 60 °C, is rated under 50 dB at 3 ft, measures 773 x 566 x 285 mm (30.43 x 22.28 x 11.22 in) and weighs 115 lb (52 kg). EG4's 10-year warranty must be registered within the first year or backed by proof of purchase from an EG4 authorized distributor, and EG4 says product not bought through an approved vendor is not covered. EG4 sells it through its sister company Signature Solar.
