Growatt WIT 20K-HU 20kW 3 Phase Hybrid Inverter
- 20kW nominal three-phase AC output
- Up to 40kW recommended PV input
- 1000V DC maximum PV voltage
- 150–850V DC MPPT operating range
- 2 independent MPPT trackers
- 40A maximum current per MPPT
- 40–60V battery operating range
- 51.2V recommended battery voltage
- Up to 420A battery charging and discharging current
- 97.6% maximum conversion efficiency
- 99.90% maximum MPPT efficiency
$2,050
Description
Growatt WIT 20K-HU Technical Data
PV Input and Solar Charging
The solar input section is designed to accommodate a relatively large PV array compared with the inverter’s nominal AC output. The main electrical specifications are:
| PV Parameter | WIT 20K-HU |
|---|---|
| Recommended Maximum PV Power | 40,000W |
| Maximum PV Voltage | 1000V DC |
| PV Start Voltage | 180V DC |
| Nominal PV Voltage | 625V DC |
| MPPT Operating Range | 150–850V DC |
| Maximum Current per MPPT | 40A |
| Maximum Short-Circuit Current per MPPT | 50A |
| MPPT Trackers | 2 |
| PV Strings per MPPT | 2 |
| MPPT Efficiency | 99.90% |
AC Output Performance
This hybrid inverter is designed for three-phase AC systems and provides a 20kW nominal output. Its backup section can temporarily supply twice the rated power for up to 10 seconds.
| AC Output Parameter | Specification |
|---|---|
| Rated Grid Output Power | 20,000W |
| Maximum Grid Output Apparent Power | 22,000VA |
| Maximum Backup Apparent Power | 2 × Rated Power / 10 seconds |
| Maximum Backup Output Current | 60.61A |
| Rated Output Voltage | 220/380V, 230/400V, 240/415V |
| Output Frequency | 50/60Hz |
| Maximum Power Factor Adjustment | -1 to +1 |
| Backup Output THDv | 3% (@ Linear Load) |
| Three-Phase Load Unbalance | 100% |
| Grid-to-Backup Transfer Time | <10ms |
| AC Connection | 3P+PE / 3P+N+PE |
One of the notable characteristics of this model is its ability to operate with 100% three-phase load unbalance. This can be relevant in installations where the electrical demand is not evenly distributed between the three phases.
Battery System Specifications
This solar inverter works with battery systems operating between 40V and 60V, with 51.2V listed as the recommended battery voltage.
| Battery Parameter | Specification |
|---|---|
| Compatible Battery Chemistry | Lead-acid / Lithium-ion |
| Battery Voltage Range | 40–60V |
| Recommended Battery Voltage | 51.2V |
| Maximum Charging Current | 420A |
| Maximum Discharging Current | 420A |
| BMS Communication | RS485 / CAN |
For lithium-ion battery installations, the available RS485 and CAN communication interfaces allow the inverter to communicate with the battery management system where supported by the battery.
Grid, Generator and AC-Coupling Data
The WIT 20K-HU can be integrated into systems that include the electrical grid, a generator, and AC-coupled equipment.
| Grid / Generator Parameter | WIT 20K-HU |
|---|---|
| Grid AC Input / Output Rated Power | 40,000W / 20,000W |
| Maximum Grid AC Input / Output Apparent Power | 44,000VA / 22,000VA |
| Maximum Grid Input / Output Current | 66.67A / 33.33A |
| Maximum GEN / AC Couple Input Current | 60.61A / 30.30A |
| Nominal AC Voltage | 220/380V, 230/400V, 240/415V |
| AC Voltage Tolerance | -15% to +10% |
| Grid Frequency | 50/60Hz |
| Frequency Range | 45–55Hz / 55–65Hz |
| Adjustable Power Factor | -1 to +1 |
| Grid Connection | 3P+PE / 3P+N+PE |
This configuration makes the inverter suitable for hybrid installations where different energy sources need to be integrated into one system.
Operating Functions and Energy Management
| Function | WIT 20K-HU Capability |
|---|---|
| Three-Phase Operation | Yes |
| Generator Integration | Yes |
| AC Coupling | Yes |
| Battery Storage | Yes |
| Maximum Parallel Units | 10 |
| Three-Phase Load Unbalance | 100% |
| Short-Term Overload Capability | 200% for 10 seconds |
| Grid / Backup Transfer | <10ms |
| BMS Communication | RS485 / CAN |
| Wi-Fi / LAN | Yes |
Up to 10, 20K-HU units can be connected in parallel. Based on the nominal rating of each inverter, ten units would represent a combined rated capacity of 200kW.
Efficiency and Electrical Performance
| Performance Parameter | Value |
|---|---|
| Maximum Efficiency | 97.6% |
| European Efficiency | 97% |
| MPPT Efficiency | 99.90% |
| Maximum Battery Current | 420A |
| Backup Overload Capability | 200% for 10 seconds |
| Transfer Time | <10ms |
| Output THDv | 3% @ Linear Load |
The maximum efficiency is specified at 97.6%, while the European efficiency rating is 97%. The MPPT section reaches a maximum efficiency of 99.90% according to the manufacturer’s specifications.
Protection and Safety Functions
The inverter incorporates several protection and monitoring functions for the PV, AC, grid, and battery-connected system.
| Protection / Monitoring | Status |
|---|---|
| PV Reverse Polarity Protection | Yes |
| DC Switch | Yes |
| DC Surge Protection | Type II |
| AC Surge Protection | Type III |
| Insulation Resistance Monitoring | Yes |
| Residual Current Monitoring | Yes |
| AC Short-Circuit Protection | Yes |
| Ground Fault Monitoring | Yes |
| Grid Monitoring | Yes |
| PV String Monitoring | Yes |
| Anti-Islanding Protection | Yes |
| AFCI | Optional |
Dimensions, Cooling and Installation Conditions
| Physical Specification | Value |
|---|---|
| Dimensions (W × H × D) | 475 × 695 × 241mm |
| Weight | 58kg |
| Enclosure Protection | IP66 |
| Cooling Method | Smart Air Cooling |
| Topology | Transformerless |
| Noise Level | ≤55dB(A) |
| Display | OLED / LED + APP |
| RS485 / USB | Yes |
| Wi-Fi / LAN | Yes |
The IP66 enclosure rating, smart air cooling system, and transformerless topology are part of the inverter design. The unit weighs 58kg and measures 475 × 695 × 241mm.
Operating Environment
| Environmental Parameter | Specification |
|---|---|
| Operating Temperature | -30°C to +60°C |
| Derating Temperature | Above 45°C |
| Relative Humidity | 0–100% |
| Maximum Operating Altitude | 4000m |
| Protection Class | IP66 |
The specified operating temperature is -30°C to +60°C, with output derating applicable above 45°C. The inverter is also specified for installation at altitudes of up to 4000m.
Where Can the Growatt 20K-HU solar inverter Be Used?
The combination of a 20kW AC rating, 40kW recommended PV capacity, high battery current, and three-phase backup functionality allows the WIT 20K-HU to be considered for applications such as:
- Commercial photovoltaic installations
- Three-phase solar-plus-storage systems
- Large residential energy systems
- Battery backup installations
- Generator-assisted hybrid systems
- AC-coupled solar systems
- Off-grid and backup power configurations
- Energy storage projects with three-phase loads
- Installations with unbalanced phase loads
What to Check Before Buying the WIT 20K-HU
| Selection Point | WIT 20K-HU Data |
|---|---|
| Inverter Nominal Power | 20kW |
| Recommended PV Capacity | Up to 40kW |
| PV Maximum Voltage | 1000V DC |
| MPPT Range | 150–850V DC |
| MPPT Count | 2 |
| Battery Voltage | 40–60V |
| Recommended Battery Voltage | 51.2V |
| Maximum Battery Current | 420A |
| Parallel Configuration | Up to 10 units |
| Generator Input | Supported |
| AC Coupling | Supported |
FAQs
How efficient is the Growatt WIT 20K-HU hybrid inverter?
It 20K-HU offers high conversion efficiency for solar energy systems, with a maximum efficiency of 97.6%. Its MPPT efficiency reaches 99.90%, helping maximize the available energy from the connected PV array.
This hybrid inverter supports a maximum PV input voltage of 1000V DC. Its PV start voltage is 180V DC, while the nominal PV voltage is 625V DC.
Yes. The 20K-HU solar inverter provides a backup output and can transition between on-grid and off-grid operation in less than 10 milliseconds, helping maintain power for connected loads.
It supports three-phase AC output voltages of 220/380V, 230/400V, and 240/415V, with a nominal frequency of 50/60Hz.
Yes. Up to 10 units can operate in parallel, allowing the total system capacity to be increased when a single 20kW inverter is not sufficient.
The WIT 20K-HU supports RS485, USB, Wi-Fi, and LAN communication interfaces. It also provides RS485 and CAN communication for compatible battery management systems.
The Growatt 20K-HU has an IP66 protection rating and includes protection functions such as PV reverse polarity protection, DC and AC surge protection, insulation resistance monitoring, residual current monitoring, ground fault monitoring, and anti-islanding protection.
The 20K-HU hybrid inverter is designed to operate from -30°C to +60°C. Its power output is subject to temperature derating above 45°C, and the inverter can operate at altitudes of up to 4000 meters.
The Growatt 20kW solar inverter uses smart air cooling to manage operating temperature during operation. This cooling system is designed to support stable performance under varying load and environmental conditions.
1 review for Growatt WIT 20K-HU 20kW 3 Phase Hybrid Inverter
1 review for Growatt WIT 20K-HU 20kW 3 Phase Hybrid Inverter
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Does Growatt WIT 20K-HU support backup power during outages?
James Anderson –
Does Growatt WIT 20K-HU support backup power during outages?
webmaster –
Yes, it can provide backup power when connected with compatible battery storage systems.