Inverters

EG4 FlexBOSS18 13kW AC Hybrid Inverter | 48V Split Phase | 18kW PV Input

$ 3,209USD · price may vary

Model: 1589004-01
Specifications: 0

Overview

EG4 FlexBOSS18 Hybrid Inverter | 48V Split Phase | 18kW PV Input

The EG4 FlexBOSS18 Hybrid Inverter is a powerful, all-in-one solution designed for homeowners, DIYers, and installers looking for a cost-effective way to maximize energy efficiency. Whether you’re building a fully off-grid system or optimizing grid-tied energy use, this inverter delivers professional-grade performance at an accessible price.

Key Features

✅ High Power Output

13kW continuous power with PV input

18kW max solar input

10kW continuous battery-only output

✅ Seamless Grid & Battery Integration

Works in grid-tied, off-grid, and hybrid setups

Supports closed-loop communication with EG4 batteries

Compatible with the EG4 GridBOSS MID for advanced energy management

✅ Industry-Leading Compliance & Safety

UL1741-certified for safety and reliability

Built-in Rapid Shutdown (RSD) for NEC 690.12 compliance

Multiple protection features, including PV reverse polarity, surge, and short-circuit protection

✅ Efficient & Cost-Effective Solar

Up to 600VDC PV Input, eliminating the need for a combiner box

Dual MPPT technology for optimized solar harvesting

94% battery-to-grid efficiency and 97.5% PV-to-grid efficiency

✅ Easy Installation & Monitoring

Wall-mountable design with a compact footprint

Plug-in Wi-Fi module for remote system monitoring via the EG4 app

90A grid bypass for seamless power flow

Why Choose the EG4 FlexBOSS18?

The FlexBOSS18 is engineered for those who want high performance without the high price. With increased PV capacity, hybrid capabilities, and certifications for grid compliance, it’s a future-proof investment for energy independence.

Pairing this inverter with the EG4 GridBOSS MID unlocks additional features like time-of-use optimization, load shifting, and backup prioritization—giving you full control over your energy system.

Specifications

🔋 Power & Output

AC Output: 120/240V split-phase | 13kW max | 10kW battery-only

Max PV Input: 18kW (600VDC) across two MPPTs

Surge Capacity: 156A peak

⚡ Efficiency & Protection

MPPT Efficiency: 99%

Battery-to-Grid Efficiency: 94%

Protection: PV reverse polarity, over-voltage, short circuit, AFCI, GFCI

📡 Connectivity & Control

Wi-Fi App Monitoring for remote access

Closed-loop communication with EG4 48V batteries

Rapid Shutdown (RSD) & NEC Compliance

📏 Size & Installation

Dimensions: 29.5" x 20.5" x 10.4"

Weight: 115 lbs

Mounting: Wall-mountable

Take Control of Your Energy Future

Whether you’re upgrading an existing system or building from scratch, the EG4 FlexBOSS18 delivers unbeatable performance and affordability. Shop now and make the switch to reliable, high-efficiency solar power!

How to read this datasheet

Detailed specifications for EG4 FlexBOSS18 13kW AC Hybrid Inverter | 48V Split Phase | 18kW PV Input have not been published yet. EG4 lists this inverter in the Inverters, and we add fields as the manufacturer releases them — in the meantime, ask your distributor for the datasheet before ordering.

For an inverter, the figures that matter most are topology — on-grid, off-grid, hybrid or micro, continuous AC output in kW, which caps the load you can run at once, surge or peak rating, which covers the brief inrush of motors and compressors and maximum PV input and the number of MPPT trackers, which set how many panel strings you can connect. It is the component that decides what a solar system can do: how much power you can draw at once, whether you can export to the grid, whether the system keeps running in a blackout, and how well the panels and battery are managed day to day.

What to check before ordering

The checks below apply to any inverter. Run them against the specification table above — most disappointing solar purchases are compatible-on-paper units that fail one of these in practice.

Look at the warranty term and what it covers. Five years is the common baseline, ten is offered by stronger brands, and extensions are often cheaper bought with the unit than later.
Size the inverter against the loads you need to run simultaneously, not against the total wattage of every appliance in the building — a 5 kW inverter comfortably runs a fridge, fans, lights and a couple of ACs, but not all of them plus a water pump starting at the same time.
Keep the panel array between roughly 1.0 and 1.3 times the inverter's rating. Slight oversizing (a higher DC-to-AC ratio) captures more energy on cloudy mornings and winter days; going far beyond it wastes generation through clipping.
Check the surge rating if you run motors — deep-well pumps, compressors and older air conditioners can draw two to three times their running current for a few seconds at start-up.

Common mistakes

Overlooking the IP rating. An outdoor installation needs at least IP65; indoor-rated units mounted outside fail early.
Buying on peak-watt price alone. A cheap inverter with a narrow MPPT window forces awkward string layouts and can strand a portion of the array.
Ignoring the ambient temperature rating. Inverters derate in heat, so a unit rated 5 kW at 25 °C may deliver noticeably less on a hot roof-adjacent wall at 45 °C.

Price and availability in United States

EG4 FlexBOSS18 13kW AC Hybrid Inverter | 48V Split Phase | 18kW PV Input is listed at $ 3,209 (USD) for United States. Solar pricing moves with supply, import duties and exchange rates, and distributors set their own margins, so treat this as a comparison reference and confirm the current figure before you order.

SolarBazaar compares equipment rather than selling it. Shortlist here on specification and price, then buy from an authorised distributor or installer in United States: warranty cover on solar hardware is normally honoured through the channel you bought from, so confirm who supports EG4 locally before ordering.

EG4 FlexBOSS18 13kW AC Hybrid Inverter | 48V Split Phase | 18kW PV Input — frequently asked questions

How much does EG4 FlexBOSS18 13kW AC Hybrid Inverter | 48V Split Phase | 18kW PV Input cost?

EG4 FlexBOSS18 13kW AC Hybrid Inverter | 48V Split Phase | 18kW PV Input is listed at $ 3,209 (USD) for United States. The figure is indicative — solar prices move with supply, duties and exchange rates, and each distributor sets its own margin — so confirm the current price with a supplier before ordering.

Who makes EG4 FlexBOSS18 13kW AC Hybrid Inverter | 48V Split Phase | 18kW PV Input?

EG4 FlexBOSS18 13kW AC Hybrid Inverter | 48V Split Phase | 18kW PV Input is a EG4 product, listed under inverters with model reference 1589004-01. The EG4 brand page lists the rest of its range so you can compare across the catalogue.

Is EG4 FlexBOSS18 13kW AC Hybrid Inverter | 48V Split Phase | 18kW PV Input right for my system?

That depends on what it has to connect to. For an inverter, check the MPPT voltage window, which decides how many panels go in a string, peak and weighted (European/CEC) efficiency, typically 96–98.5% and topology — on-grid, off-grid, hybrid or micro against the rest of your equipment before price enters the decision. Keep the panel array between roughly 1.0 and 1.3 times the inverter's rating. Slight oversizing (a higher DC-to-AC ratio) captures more energy on cloudy mornings and winter days; going far beyond it wastes generation through clipping.

Where can I buy EG4 FlexBOSS18 13kW AC Hybrid Inverter | 48V Split Phase | 18kW PV Input in United States?

SolarBazaar lists and compares equipment rather than selling it. Use the specifications and price here to shortlist, then buy through an authorised distributor or installer in United States — buying in-channel is what keeps the manufacturer's warranty valid.

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