Growatt MAX 320K-X / 333K-X / 350K-X High Power Solar Inverter

The Growatt MAX 320K-X, MAX 333K-X and MAX 350K-X are high power three phase grid tied photovoltaic inverters developed for large scale solar power generation. With 320kW, 333kW and 352kW AC output power respectively, the series is suitable for large commercial rooftop solar systems, industrial PV installations, ground-mounted solar projects and utility scale photovoltaic power plants.

The inverter combines a high-voltage 1500V DC architecture, 800V AC output,6 MPPT trackers and high current PV input to support modern high-power solar modules and large scale PV system design.

High Power Output for Large-Scale PV Projects

Large photovoltaic projects require high capacity power conversion equipment to efficiently convert DC electricity generated by solar panels into AC electricity for grid connection.

The MAX 320K-X series provides:

• MAX 320K-X: 320kW AC output
• MAX 333K-X: 333kW AC output
• MAX 350K-X: 352kW AC output

This high power solar inverter platform can help reduce the number of inverters required in large PV projects and is suitable for commercial solar systems, industrial solar power systems, utility-scale solar farms and large ground-mounted PV installations.

1500V High Voltage Solar Inverter

The MAX series supports a maximum DC input voltage of 1500V, with an MPP voltage range of 500V to 1500V.

A 1500V solar inverter architecture is suitable for large photovoltaic power plants where high-voltage DC system design can help optimize PV array configuration and power transmission.

Key DC Parameters

6 MPPT Design for Flexible Solar Array Configuration

The inverter features 6 independent MPPT trackers, providing greater flexibility for PV system design.

Multiple MPPT channels can help manage different PV array configurations and installation conditions. This makes the inverter suitable for large commercial rooftops and other photovoltaic projects where solar modules may have different orientations or string configurations.

The inverter supports up to 5 PV strings per MPPT tracker, providing a total of up to 30 string connections across six MPPT channels.

80A MPPT Current for High-Power Solar Panels

Modern PV modules are increasingly available with higher output power and higher operating current. The MAX series supports 80A maximum input current per MPPT and up to 100A short-circuit current per MPPT.

According to the product datasheet, the inverter is adapted to 182mm and 210mm PV modules, making it suitable for high-power solar panel applications in large-scale photovoltaic systems.

This makes the platform suitable for system designers working with high-power modules and large PV arrays.

Up to 99.03% Maximum Efficiency

The MAX 320K-X series achieves a maximum efficiency of 99.03%, with a European efficiency of 98.53% and MPPT efficiency of 99.90%.

High conversion efficiency helps minimize energy losses during DC to AC power conversion and supports efficient electricity generation in large-scale solar PV systems.

Efficiency

• Maximum efficiency: 99.03%
• European efficiency: 98.53%
• MPPT efficiency: 99.90%

For commercial and utility-scale solar projects, inverter efficiency is an important consideration because even small conversion losses can affect the overall energy yield of a large PV installation.

Intelligent PV String Detection and I/V Scanning

Solar PV systems can contain a large number of individual strings. Identifying abnormal strings quickly is important for system operation and maintenance.

The MAX series provides intelligent string detection and I/V scanning, helping locate abnormal PV strings more accurately.

This functionality can support:

• PV string monitoring
• Abnormal string identification
• Solar system troubleshooting
• Preventive maintenance
• Large-scale PV operation and maintenance

These functions are particularly relevant for utility-scale solar farms and large commercial PV systems, where efficient O&M can be important for maintaining system performance.

IP66 Protection for Outdoor Solar Installation

The MAX series features an IP66 protection rating and smart air cooling.

The specified operating temperature range is -30°C to +60°C, making the inverter suitable for demanding outdoor photovoltaic installation environments.

Environmental Specifications

The datasheet specifies derating above 4000m altitude.

Comprehensive Protection for Grid-Tied PV Systems

Safety and electrical protection are important for large-scale grid-connected solar installations.

The MAX series includes multiple protection functions:

• DC reverse polarity protection
• DC switch
• Type II DC surge protection
• Type II AC surge protection
• Insulation resistance monitoring
• RCD detection
• Output short-circuit protection
• String fault monitoring
• Optional Anti-PID function

These protection functions are designed to support safe and reliable operation of the grid-tied solar inverter and photovoltaic power system.

800V AC Output for High-Power PV Systems

The MAX series uses an 800V nominal AC voltage and supports an AC output range of 640V to 920V.

The three-phase grid connection type is 3W+PE, with a 50/60Hz grid frequency range.

This configuration is designed for high-power three-phase photovoltaic applications and large-scale grid-connected solar projects.

Aluminum Wire Compatible Design

For large commercial and utility-scale PV installations, AC cabling can represent a significant part of the balance-of-system cost.

The MAX series supports aluminum wire access, which can provide an additional cabling option for project designers and may help reduce AC cable costs.

This feature can be particularly relevant to EPC contractors, solar project developers and system integrators working on large PV installations.

Applications

The Growatt MAX 320K-X series can be considered for a wide range of high-power photovoltaic applications, including:

Commercial Rooftop Solar

Large warehouses, factories, commercial buildings and business facilities with extensive rooftop PV arrays.

Industrial Solar Power Systems

Industrial facilities requiring large-scale solar generation and three-phase grid-connected power conversion.

Utility-Scale Solar Farms

Large ground-mounted photovoltaic power plants requiring high-power 1500V solar inverters.

Large Scale PV Projects

Solar EPC projects, photovoltaic power stations and other high-capacity grid-connected solar installations.

Technical Specifications

Why Choose This High Power Solar Inverter?

For buyers sourcing high power PV equipment, the MAX 320K-X series combines several important system level features in one platform:

High Power: 320kW, 333kW and 352kW output options for large PV projects.

High Voltage: 1500V maximum DC input for modern high-voltage photovoltaic system design.

High Current: 80A maximum input current per MPPT for high-power PV modules.

Flexible MPPT:6 MPPT trackers with up to 5 PV strings per tracker.

High Efficiency: Up to 99.03% maximum conversion efficiency.

Easy O&M: Intelligent string detection and I/V scanning support PV system troubleshooting.

Outdoor Ready: IP66 protection and smart air cooling for outdoor solar installations.

Cost Consideration: Aluminum wire access can help reduce AC cable costs in large scale PV projects.