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

Fox ESS H1(G2)/AC1(G2) is a single-phase high-voltage energy storage inverter platform for residential solar and battery storage systems. Ocean Solar supplies H1(G2) hybrid inverters for new solar-plus-storage projects and AC1(G2) AC-coupled inverters for compatible battery retrofit applications.

H1(G2) integrates direct PV input, two independent MPPT trackers, high-voltage battery connection, grid operation and EPS backup. AC1(G2) provides the corresponding AC-coupled storage architecture for systems where the battery is integrated on the AC side without connecting PV strings directly to the storage inverter.

The 3.0kW-6.0kW models support 80-480V LFP batteries, up to 40A battery charge and discharge current, less than 10ms EPS transfer, IP65 protection, natural cooling, remote monitoring and parallel operation of up to 10 compatible units.

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

Selecting between H1(G2) and AC1(G2) depends primarily on the system architecture. H1(G2) is designed for direct connection of the photovoltaic array, while AC1(G2) is intended for compatible AC-coupled battery storage systems.

PV voltage, current and MPPT specifications apply to H1(G2) hybrid models only. AC1(G2) project design should instead consider the existing PV inverter, AC system architecture, battery compatibility, metering and control requirements.

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H1(G2)/AC1(G2) 3kW-6kW Model Range

Ocean Solar offers selected H1(G2)/AC1(G2) power classes from 3.0kW to 6.0kW. The table below shows the principal ratings for project selection.

*PV array and DC input ratings apply to H1(G2) hybrid models. Final PV string design must also comply with voltage and current limits.

Dual MPPT Solar Input for H1(G2)

Two Independent MPPT Trackers

H1(G2) hybrid models provide two independent MPPT trackers with one PV string connected to each MPPT. Independent tracking can be useful when photovoltaic strings operate under different roof orientations or solar conditions.

80-550V MPPT Operating Range

The H1(G2) MPPT operating voltage range is 80-550VDC. Start-up voltage is 75V, rated PV input voltage is 360V and maximum PV input voltage is 600VDC.

16A Input Current per MPPT

Maximum operating input current is 16A per MPPT and maximum short-circuit current is 20A per MPPT. PV module Imp, Isc, Voc and Vmp should all be checked before finalizing string configuration.

Up to 12kW PV on the 6kW H1(G2)

The H1-6.0-E-G2 supports up to 12000Wp of PV array power according to the applicable specification. PV oversizing should still be engineered around the inverter's maximum voltage, MPPT current and short-circuit-current limits.

80-480V High-Voltage LFP Battery Platform

H1(G2) and AC1(G2) are designed for compatible high-voltage lithium iron phosphate battery systems operating between 80V and 480V.

Maximum battery charge and discharge current is 40A. CAN communication is used for compatible battery management system communication.

Battery compatibility should be confirmed by exact battery model, operating voltage, BMS protocol, charge and discharge limits before ordering or commissioning.

High-Efficiency Battery Conversion

Maximum PV-to-battery charging efficiency is specified at 98.5%, while maximum battery-to-AC discharge efficiency is specified at 97.0%.

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EPS Backup Power with Less Than 10ms Transfer

H1(G2)/AC1(G2) provides an EPS output for appropriately designed backup-load circuits when a compatible battery system is installed.

Rated EPS output follows the inverter power class from 3.0kVA to 6.0kVA. Peak EPS output is available at up to 120% of rated power for 60 seconds, with the 6kW model providing up to 7200VA for 60 seconds.

EPS transfer time is specified at less than 10ms. Equipment with specific continuity requirements should still be checked against its permitted interruption time before being assigned to the backup circuit.

Up to 97.08% Maximum Inverter Efficiency

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

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

IP65 Protection and Natural Cooling

IP65 Enclosure

The inverter enclosure is rated IP65 for dust and water ingress protection. This provides installation flexibility for suitable residential indoor and outdoor locations when installed according to the Fox ESS installation requirements.

Fanless Natural Cooling

Natural cooling avoids the need for a continuously operating cooling fan. Noise emission is specified at approximately 35dB.

FoxCloud Remote Monitoring

WiFi monitoring is supported as standard, with optional LAN and 4G monitoring modules available depending on project configuration.

Operating information can be accessed through supported LCD, app and web interfaces. FoxCloud provides remote system monitoring for compatible installations.

Communication interfaces include RS485, DRM, Ripple Control, USB, CAN and SG Ready according to the applicable product configuration.

Parallel Operation up to 10 Inverters

The H1(G2)/AC1(G2) platform supports parallel operation of up to 10 compatible units.

Parallel-system configuration should follow the applicable Fox ESS installation documentation, including communication, battery, metering, EPS and protection requirements.

Integrated Electrical Protection

Dimensions and Environmental Specifications

Residential Energy Storage Applications

New Solar Plus Battery Systems

H1(G2) is suitable for appropriately designed new residential photovoltaic and battery installations where PV generation, high-voltage battery storage, grid connection and EPS backup are managed through one hybrid inverter.

AC-Coupled Battery Retrofit

AC1(G2) provides an AC-coupled storage option for compatible installations where battery storage is added on the AC side without routing existing photovoltaic strings directly through the storage inverter.

Solar Self-Consumption

A compatible energy storage system can store available solar generation for later household use, helping increase the proportion of locally generated electricity consumed on site.

Time-of-Use Energy Management

Battery charging and discharging schedules can be configured according to supported operating modes, household demand and applicable electricity tariffs. Available functions depend on local system configuration and grid requirements.

Emergency Backup Power

EPS output can supply appropriately designed essential-load circuits during a grid outage. Backup duration depends on connected load, battery capacity, usable state of charge and system conditions.

How to Select H1(G2) or AC1(G2)

Choose H1(G2) when the new photovoltaic array will connect directly to the storage inverter and the project requires integrated PV conversion, high-voltage battery storage and EPS functionality.

Choose AC1(G2) when a compatible battery storage system needs to be integrated on the AC side of an existing or separately designed photovoltaic system.

Before selection, confirm the existing PV inverter, battery model, smart meter or CT arrangement, required backup loads, grid connection and energy-management requirements.

PV Module Compatibility for H1(G2)

PV module selection should consider more than total array wattage. String Voc, Vmp, Imp and Isc must all remain within the inverter electrical limits.

H1(G2) provides a 600V maximum PV input voltage, 80-550V MPPT operating range, 16A maximum operating current per MPPT and 20A maximum short-circuit current per MPPT.

Cold-temperature Voc calculations should be completed before finalizing the number of modules connected in series.

Battery Compatibility and System Design

The inverter requires a compatible high-voltage LFP battery operating within the 80-480V battery range.

Battery voltage, usable capacity, maximum charge and discharge current and CAN communication compatibility should be confirmed for the specific battery model before installation.

Installation and Grid Connection

Installation involves photovoltaic DC wiring for H1(G2), high-voltage battery connections, utility AC wiring, EPS circuits, protective devices, grounding, communication connections and meter or CT installation.

Installation and commissioning should be completed by qualified personnel according to the applicable Fox ESS documentation and local electrical and grid-connection requirements.

Safety and Grid Standards

The applicable product documentation lists EN 62109-1 and EN 62109-2 safety standards together with grid requirements including G98, G99, EN 50549 and AS/NZS 4777.2.

Required approvals vary by country, utility and model configuration. Buyers and installers should confirm that the exact inverter model and firmware configuration are approved for the destination market before ordering.

For Distributors, Installers and Residential Energy Storage Projects

The H1(G2)/AC1(G2) platform provides two energy-storage architectures within one product family: direct-PV hybrid operation with H1(G2) and AC-coupled battery integration with AC1(G2).

For a project quotation, provide the required inverter power, destination country, PV module model, planned PV capacity for H1 projects, battery model and capacity, backup-load requirement, monitoring requirements and order quantity.

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

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

H1(G2) is the hybrid version with direct photovoltaic input and two MPPT trackers. AC1(G2) is the AC-coupled version and does not use direct PV input.

What power ratings are available from Ocean Solar?

The product range shown here includes 3.0kW, 3.7kW, 4.6kW, 5.0kW and 6.0kW single-phase models.

How many MPPT trackers does H1(G2) have?

H1(G2) provides two independent MPPT trackers with one photovoltaic string per MPPT.

What is the H1(G2) MPPT voltage range?

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

What is the maximum PV input current?

Maximum PV operating current is 16A per MPPT and maximum short-circuit current is 20A per MPPT.

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

The applicable specification lists a maximum PV array power and maximum DC input power of 12000W for the H1-6.0-E-G2. Voltage and current limits must also be observed.

What battery voltage does H1(G2)/AC1(G2) support?

The battery operating voltage range is 80-480V for compatible high-voltage LFP batteries.

What is the maximum battery charge and discharge current?

Maximum battery charge and discharge current is 40A.

Does the inverter provide backup power?

Yes. H1(G2)/AC1(G2) provides EPS backup output when a compatible battery and correctly designed backup circuit are installed.

What is the EPS transfer time?

EPS switching time is specified at less than 10ms.

What peak backup output does the 6kW model provide?

The 6kW model provides 6000VA rated EPS output and up to 7200VA peak EPS output for 60 seconds.

What is the maximum inverter efficiency?

Maximum inverter efficiency reaches up to 97.08%, depending on model.

Can H1(G2)/AC1(G2) be installed outdoors?

The inverter is rated IP65. Outdoor installation should follow the applicable Fox ESS installation manual, mounting requirements and local electrical regulations.

Does the inverter use a cooling fan?

The H1(G2)/AC1(G2) uses natural cooling. Noise emission is specified at approximately 35dB.

Does the inverter support remote monitoring?

Yes. WiFi monitoring is supported, with optional LAN and 4G communication depending on configuration. LCD, app and web-based monitoring interfaces are available.

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

Yes. The product platform supports up to 10 compatible inverters in parallel when the system is designed according to the applicable Fox ESS parallel-installation requirements.

What are the dimensions and weight?

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

When should I choose H1(G2)?

H1(G2) is generally the relevant architecture for a new residential solar-plus-storage system where the photovoltaic array will connect directly to the hybrid inverter.

When should I choose AC1(G2)?

AC1(G2) is intended for compatible AC-coupled battery-storage applications where the photovoltaic generation system is connected separately on the AC side.

What information should I provide for a quotation?

Please provide the required inverter power, quantity, destination country, PV module and array information for H1 projects, battery model and capacity, backup-load requirements and required monitoring configuration.

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