EG4 EG4INV18KPV00V2 12kW Hybrid DC/AC Coupled Inverter

The EG4® 18kPV Hybrid Inverter (EG4INV18KPV00V2) is a 48V split-phase, all-in-one hybrid inverter/charger built to utilize up to 18kW of PV while continuously outputting 12kW of power and charging the battery bank simultaneously. Measuring 34.3 × 20.5 × 11.2 in. (870 × 520 × 285 mm) and weighing 121 lbs. (55 kg), it carries a NEMA 4X outdoor rating for flexible installation. Up to 10 units can be paralleled for 120kW of AC output, with multiple stations and units controlled through the EG4 monitoring software.

Key specifications

• PV input: 3 MPPTs, 100–600 VDC input range, 140–500 VDC MPPT operating range, 18,000W maximum utilized solar power, 21,000W recommended maximum solar input
• AC output: 12,000W continuous @240VAC (10,400W @208VAC), 50A max output current, 120/240VAC or 120/208VAC (L1/L2/N required) split-phase, 50/60Hz
• Battery: 48 VDC nominal, lead-acid or lithium compatible, 250A max charge/discharge current, >200Ah recommended capacity per inverter
• Connectivity: RS485/Wi-Fi/CAN communication interface; mountable Wi-Fi device pairs with the EG4 app or EG4 Monitor system
• Physical & certifications: 121 lbs. (55 kg); -13°F to 140°F (-25°C to 60°C); NEMA 4X outdoor rating; UL1741B Rule 21, IEEE 1547.1:2020/IEEE 1547:2018, CSA 22.2.107.1, CSA 22.2.330, FCC Part 15 Class B

One inverter, three ways to run your system

The 18kPV is capable of running entirely off the grid, using grid assist to draw from the utility only when needed, or selling excess power back to the grid — all from the same unit. Its high-frequency, transformerless design delivers up to 97.5% maximum efficiency PV-to-grid and 99.9% PV-to-battery, while closed-loop communication with EG4 48V batteries (and other brands, with a firmware update required for LifePower4) keeps charge and discharge cycles coordinated automatically. Paired with the EG4 monitoring software, installers and owners get a single view into production, consumption, and battery state across the whole system.

Key Applications

• Residential backup and self-consumption — runs the home from PV and battery first, drawing from or exporting to the grid only as needed, with a 10-year standard warranty.
• Off-grid and grid-assist installations — the all-in-one hybrid design handles charging, inversion, and transfer without additional switchgear.
• Multi-unit commercial arrays — parallel up to 10 units for 120kW of AC output, managed centrally through EG4 monitoring software.
• High-voltage PV strings — up to 600VDC input across 3 MPPTs supports a recommended 21kW of PV per unit, reducing cable sizing and eliminating the need for a combiner box.
• NEC 2020 rapid shutdown, AFCI, and GFDI compliance — meets Section 690.12 (RSD), 690.11/UL1699B (AFCI), and 690.41(B) (GFDI) requirements out of the box.

Powering and pairing the 18kPV

Three MPPTs (2 inputs on MPPT1, 1 each on MPPT2 and MPPT3) accept up to 600VDC, with a 140–500VDC operating range and a 100VDC startup voltage — giving installers room to string PV for up to 21kW of recommended input per unit. On the battery side, the 18kPV supports 48VDC lead-acid or lithium banks at up to 250A of charge/discharge current, communicating over RS485 for closed-loop coordination with EG4 batteries and other major brands. AC output is high-frequency split-phase, configurable for a single 120/240V unit or 120/208V service, with a default 20ms transfer time (10ms configurable) and a 90A AC bypass for generator integration. The mountable Wi-Fi device connects the unit to the EG4 app or EG4 Monitor platform, and up to 10 units can be paralleled where a single inverter isn't enough.

Why choose the EG4® 18kPV Hybrid Inverter?

The 18kPV packs off-grid capability, grid-assist, AC coupling, and battery charging into a single transformerless unit, cutting down on the extra switchgear many hybrid installations otherwise require. Its 600VDC PV input and 21kW recommended solar capacity per unit reduce combiner-box needs on larger arrays, while closed-loop communication with EG4 and third-party 48V batteries keeps the system self-managing. Backed by a 10-year standard warranty and a full slate of NEC 2020 and IEEE 1547 certifications, it's built to stay code-current while scaling from a single residential install up to a 120kW parallel commercial system.