Hybrid/AC-Coupled Energy Storage Inverter Single-Phase H1(G2)/AC1(G2) Series（3kW-6kW）

Fox ESS H1(G2)/AC1(G2) 3-6kW Single-Phase Energy Storage Inverter

The Fox ESS H1(G2)/AC1(G2) Series is a 3kW-6kW single-phase high-voltage energy storage inverter platform for residential solar and battery storage systems. Ocean Solar supplies the Fox ESS H1(G2) hybrid inverter and AC1(G2) AC-coupled inverter series for residential energy storage projects.

The H1(G2) hybrid models integrate direct PV input, dual MPPT solar tracking, grid connection, high-voltage battery charging and EPS backup in one unit. The AC1(G2) models provide an AC-coupled storage solution for systems where battery storage is integrated on the AC side.

Available in 3.0kW, 3.7kW, 4.6kW, 5.0kW and 6.0kW rated power classes, the series supports 80-480V high-voltage LFP batteries, up to 40A battery charge/discharge current, EPS backup, IP65 protection, natural cooling and remote monitoring.

H1(G2) Hybrid vs AC1(G2) AC-Coupled Inverter

The PV input specifications shown on this page apply to H1(G2) hybrid models only. For an AC1(G2) project, system architecture, existing PV inverter, smart meter, CT configuration and battery compatibility should be confirmed before ordering.

H1(G2)/AC1(G2) Model Range

*PV array and PV input specifications apply to H1(G2) hybrid models only.

Dual MPPT and High PV Oversizing for H1(G2)

Two Independent MPPT Trackers

H1(G2) hybrid models provide two independent MPPT trackers with one PV string per MPPT. The two trackers allow installers to separate PV strings with different roof orientations or operating conditions.

80-550V MPPT Operating Range

The MPPT operating range is 80-550VDC, with a 75V start-up voltage, 360V nominal input voltage and 600V maximum PV input voltage. Maximum input current is 16A per MPPT and maximum short-circuit current is 20A per MPPT.

Up to 12kWp PV Array on the 6kW Model

The H1-6.0-E-G2 supports a maximum PV array power of 12000Wp and maximum PV input power of 9000W. Lower-power models provide proportionally matched PV array and input limits, allowing installers to select the appropriate inverter size for the residential PV system.

High-Voltage LFP Battery Compatibility

The H1(G2)/AC1(G2) series is designed for high-voltage lithium iron phosphate battery systems with an operating battery voltage range of 80-480V.

Maximum battery charge and discharge current is 40A. CAN communication is used between compatible battery management systems and the inverter, supporting battery communication and BMS interaction.

Up to 98.5% PV-to-Battery Charging Efficiency

Maximum PV-to-battery charging efficiency is specified at 98.5%, while maximum battery-to-AC discharge efficiency is up to 97.0%. This high-voltage architecture is designed to reduce conversion losses throughout the residential energy storage system.

EPS Backup Power for Residential Loads

The H1(G2)/AC1(G2) series provides an EPS emergency power output for selected backup loads during a grid outage. Rated EPS output follows the inverter power class from 3.0kVA to 6.0kVA.

Peak EPS apparent power is available for up to 60 seconds, ranging from 3600VA on the 3kW model to 7200VA on the 6kW model. The specified EPS transfer time is less than 20ms.

Up to 97.08% Maximum Inverter Efficiency

Maximum inverter efficiency reaches up to 97.08%, depending on model. European efficiency ranges from 95.26% for the 3.0kW model to 96.33% for the 6.0kW model.

Grid-side current total harmonic distortion is specified below 3% at rated power. Power factor is 1 and can be adjusted from 0.8 leading to 0.8 lagging where supported by applicable grid requirements.

IP65 Outdoor Protection and Natural Cooling

IP65 Enclosure

The inverter is rated IP65 for dust and water protection, providing greater installation flexibility for suitable indoor or outdoor residential locations. Installation should still follow the applicable Fox ESS installation manual and local electrical requirements.

Fanless Natural Cooling

Natural cooling removes the need for a continuously operating internal cooling fan. Noise emission is specified at approximately 35dB, making the series suitable for residential energy storage installations where acoustic performance matters.

Smart Monitoring and Communication

WiFi monitoring is supported as standard, with LAN and 4G monitoring options available depending on system configuration. Users can monitor system operating data through the supported Fox ESS monitoring platform.

Communication interfaces include RS485, DRM, pulse control, USB and CAN. The system supports LCD display, app-based monitoring and web-based system monitoring.

Up to 10 Units in Parallel

The H1(G2)/AC1(G2) platform supports parallel operation of up to 10 compatible units, allowing system capacity to be expanded for projects with higher backup or energy-management requirements. Final parallel design should follow the applicable Fox ESS parallel installation instructions.

Safety and Protection Functions

The inverter integrates multiple electrical protection functions for residential PV and battery energy storage systems.

Dimensions and Environmental Specifications

Residential Energy Storage Applications

New Residential Solar and Battery Systems

H1(G2) is suitable for new residential PV and battery installations where the solar array, high-voltage battery, grid supply and EPS backup are managed by one hybrid inverter platform.

AC-Coupled Battery Retrofit

AC1(G2) provides an AC-coupled storage option for projects where battery storage is added to a suitable existing PV installation without routing the PV strings directly through the storage inverter.

Time-of-Use Energy Management

A residential energy storage system can be configured to store available solar energy and discharge the battery according to household consumption and supported energy-management settings. Actual operating modes should be configured according to local tariffs, grid rules and system requirements.

Emergency Backup Power

EPS functionality provides backup power for appropriately designed essential-load circuits during a utility outage. Required battery capacity should be calculated from the expected backup load, required backup duration and usable battery capacity.

System Installation and Compatibility

Before selecting an H1(G2) model, installers should verify PV string Voc, Vmp, Isc and Imp against the inverter's 600V maximum input voltage, 80-550V MPPT range, 16A MPPT input-current limit and 20A short-circuit-current limit.

Battery model, battery voltage range, maximum battery current and CAN communication compatibility should also be confirmed before commissioning. Grid connection requirements and approved inverter settings differ by destination market.

Installation, protective devices, grounding, EPS circuits, CT or meter placement and commissioning should be completed according to the applicable Fox ESS installation documentation and local electrical regulations.

Why Choose Fox ESS H1(G2)/AC1(G2)?

The H1(G2)/AC1(G2) platform combines a 3-6kW residential power range, high-voltage battery architecture, compact wall-mounted construction, IP65 enclosure protection, natural cooling, EPS backup and smart monitoring in one product family.

The choice between H1(G2) and AC1(G2) allows project designers to select either a direct-PV hybrid architecture for a new solar-plus-storage system or an AC-coupled architecture for suitable storage retrofit applications.

Frequently Asked Questions About Fox ESS H1(G2)/AC1(G2)

What is the difference between Fox ESS H1(G2) and AC1(G2)?

H1(G2) is the hybrid version with direct PV input and two MPPT trackers. AC1(G2) is the AC-coupled version. The PV input specifications on the Fox ESS datasheet apply only to the H1 hybrid models.

What power ratings are available in the H1(G2)/AC1(G2) series?

The series includes 3.0kW, 3.7kW, 4.6kW, 5.0kW and 6.0kW rated single-phase models.

How many MPPT trackers does the H1(G2) hybrid inverter have?

The H1(G2) hybrid inverter has two independent MPPT trackers with one PV string per MPPT.

What is the MPPT voltage range?

The H1(G2) MPPT operating voltage range is 80-550VDC. Start-up voltage is 75V and maximum PV input voltage is 600VDC.

How much PV can be connected to the 6kW H1(G2)?

The H1-6.0-E-G2 has a maximum PV array power of 12000Wp and a maximum PV input power of 9000W. PV voltage and current limits must also be respected when designing the strings.

What batteries are compatible with the H1(G2)/AC1(G2)?

The datasheet specifies high-voltage LFP batteries operating from 80V to 480V, with a maximum charge and discharge current of 40A. The exact battery model and BMS communication compatibility should be confirmed before ordering.

Does the Fox ESS H1(G2)/AC1(G2) provide backup power?

Yes. The series provides EPS emergency backup output. The rated EPS power depends on inverter size, with up to 6kVA rated EPS output and 7.2kVA peak output for 60 seconds on the 6kW model.

What is the EPS switching time?

The specified EPS transfer time is less than 20ms.

What is the maximum efficiency?

Maximum inverter efficiency reaches up to 97.08%. Maximum PV-to-battery charging efficiency is 98.5%, and maximum battery-to-AC discharge efficiency is 97.0%.

Can the inverter be installed outdoors?

The H1(G2)/AC1(G2) series is rated IP65. Outdoor installation must still comply with the manufacturer's installation requirements, recommended mounting position and local electrical rules.

Does the inverter support remote monitoring?

Yes. WiFi monitoring is supported, with LAN and 4G options available depending on configuration. Monitoring is available through supported app and web interfaces.

Can multiple H1(G2)/AC1(G2) inverters operate in parallel?

Yes. The current datasheet specifies support for up to 10 compatible units in parallel. Parallel-system design should follow the applicable Fox ESS parallel installation instructions.

What are the dimensions and weight?

The inverter measures 434 × 418 × 185mm and weighs approximately 22kg.

Is H1(G2) suitable for a new residential solar system?

Yes. H1(G2) integrates direct PV input, battery storage, grid connection and EPS functionality, making it suitable for appropriately designed new residential solar-plus-storage systems.

When should I choose AC1(G2) instead of H1(G2)?

AC1(G2) is more relevant when battery storage is being integrated on the AC side of a suitable solar installation. H1(G2) is the direct-PV hybrid option. Final architecture should be confirmed by the system designer or installer.