WIT 4-15K-HU Commissioning Guide

WIT 4-15K-HU Commissioning Guide

After the installation of the WIT 4-15K-HU inverter is completed, the setting parameters need to be configured according to the on-site requirements. This document takes OSS as  an example (The settings of ShinePhone are basically similar to OSS and can be referred    to).

After the correct installation and power-on, first use OSS to check whether the code

version number matches the latest released version (the latest version as of May 2025 is

V0907-5). The system firmware version information can be viewed by OSS. If it does not

match, it is recommended to upgrade to the latest released version. And set and confirm the relevant setting items.

n Description of Settings Items on the OSS Interface

There are the following eight major items of settings on the OSS interface. After the installation is completed, these eight types of parameters need to be set.

1.  Regulation Parameter Settings

Just use the default parameters, no special settings are required after installation.

2.  General Settings

①System default working mode ": Set according to requirements, and do not modify it if

the requirements are not clear (Default mode: Load First).

②AC charging power percentage ": If it is not 100, it is recommended to modify it to 100 (representing allowing charging from the AC side).

3.  Battery Settings

(1)  Lithium battery with BMS

Generally, no special settings are required. It is recommended to focus on checking

whether the "Maximum Charge/Discharge Power" and "Maximum Charge/Discharge

Current" are set too small (Please check the charging and discharging current supported by the battery and inverter). The "Maximum charging voltage of battery" and "Discharge cutoff  voltage" should be kept at the default 60V and 40V.

(2)  Lead - acid Battery or Lithium battery without BMS

For the settings related to lead - acid batteries (or lithium - ion batteries without BMS),

please refer to the "Lead-acid Battery Setting Guide for WIT4-15K-HU". If you are not sure, you can consult the after-sales team of Growatt.

4.  On/Off-grid Parameter Settings

Default parameters, no special settings are required after installation；

Note: If there are special requirements, such as not allowing the system to work in

off-grid mode, you can set the "off-grid enable" option to "Disable";

5.  Single Inverter Export limitation Settings

(1)  Export limitation Settings

①If the export limitation function is to be disabled, set this item to "Disabled";

②If a meter is used for export limitation, set this item to "Enable Meter 1";

③If external CT are used for export limitation, set this item to "External CT";

④If Internal CT are used for export limitation, set this item to "Internal CT" (This function means export limiitation to backup load, and only the load connected to the Load port will be displayed on the monitoring systems).

(2)  Phase-Level Export Limitation Settings.

If the phase-level export limitation function is required locally, set it to "Enable", otherwise set it to "Disable".

6.  Parallel Parameter Settings

(1)  Parallel Enable

Note: Under parallel operation, two parameters such as "Number of parallel units" also  need to be set. Please refer to the introduction document of parallel operation. If you are not sure, you can consult the after-sales team of Growatt.

7.  Key parameter settings

(1)  "On-grid cable system" and "Off-grid cable system" Settings

For the 3P4W system (in most scenarios), no setting is required, just keep the default values. If there are special requirements and the 3P3W system needs to be used:

①Set "parameter protection enable" to "Enabled";

②Set both "On-grid Cable System" and "Off-grid Cable system" to "3P3W".

(2)  N-line Unconnected Enable (default" connected ")

①If an N line is connected on site, this setting item does not need to be modified; (Generally, there is an N wire on site and no setting is required.)

②If N line is not connected on site, "N-line unconnected enable" needs to be set to "unconnected".

8. Advanced Settings

(1)  Device Mode Selection and Time Setting

Configure "Device Mode Selection and Time Settings" according to requirements. If only one working mode is needed, set all time periods here to Disable, and the system will work   according to the "System Default Working Mode" in "2. General Settings". Please note that time periods cannot overlap when setting here.

(2)  PeakShaving(Default "Disable")

①If the peakshaving function is not required, keep the default value without

modification;

②If you need peakshaving function: turn "Peakshaving(Demand management)

settings" to "On", and set "Peakshaving(Demand management) Export power limit" and "Peakshaving(Demand management) Inport power limit" respectively.

Similarly, if the Peak Shaving function is not required, keep the default value without modification;

If the Peakshaving function is required, "Peak Shaving Backup SOC Enable" is enabled, and the "PeakShaving Backup SOC" is set as needed。

(3) Micro-grid System

①GEN port access device type (default "generator")

If there is no need for GEN interface to connect smart loads or GEN interface to

AC-couple inverters, no modifications will be made. If there are other requirements, this item can be set.

②Generator Enabled (default "Disabled") / Rated power of Generator

If there is no need to use generator, no modification will be made; if there is a need to use generator, set this item to "Enable".

At the same time, set the "rated power of generator" according to the actual situation;

③Enable Meter 1 / Enable Meter 2 (Default "No")

If there is a meter connected to the grid side, set "Enable Meter 1" to "Enable/On" as needed.

If the AC-couple system that connects a PV inverter and a meter on the grid side, set  "Enable Electricity Meter 2" to "Yes". If the system does not connect an inverter on the grid side, there is no need to modify this setting item. Just keep the default "No".

④"AC Couple Enabled" (default "Disabled")

If the GEN port is connected to a PV inverter(GEN port AC-couple solution), this setting item needs to be modified to "Enabled/On". If the GEN port is not connected to a PV inverter, there is no need to modify it, just keep the default "Disabled".

(4) Safety Function Control

①"Low voltage ride through enable" (default "disable")

Check the "Low Voltage Ride Through Enable" setting item. If there is no low voltage ride through requirement, keep the setting as "Disabled".

n Special setting instructions

1.  Instructions on related settings for external CT/ meter configuration

①When the system needs to set the export limitation enable function, follow "Part 1   Description of Settings Items on the OSS Interface" -> "5. Single Inverter Export limitation Settings" -> "(1) Export limitation Settings";

②When the system does not need to use export limitation function but install a meter or CT, it is necessary to separately set the "Meter 1 enable" or "External CT" enable; if the

system uses a meter, follow "Part 1 Description of Settings Items on the OSS Interface" -> "8. Advanced Settings" -> "(3) Micro-grid System" -> set "Enable Meter 1" to "Enable"; if the

system uses an external CT, it is necessary to set the "863" register to 1 through the "Register" setting item in the OSS settings.

2.  Instructions on the relevant settings for the dual-meter method

If there is an inverter operating in a grid-connected mode on-site, a dual-meter method needs to be adopted. The setting methods of the two meters are introduced respectively:

①For the "grid-side", it can be connected to a meter or an external CT. Refer to "1.   Instructions on related settings for external CT/ meter configuration" for the setting of this item.

②For the "inverter-side", it can only be connected to a meter. Refer to "Part 1

Description of Settings Items on the OSS Interface" -> "(3) Micro-grid System" -> set "Enable meter 2" to 1 for the setting of this item.

3.  Instructions  on  relevant settings for connecting the  GEN  port to the inverter

If there is an inverter in the working mode of being connected to the GEN port on site, the following settings are required:

①Equipment type connected to the GEN port: Refer to "Part 1 Description of Settings Items on the OSS Interface" -> "8. Advanced Settings" -> "(3) Micro-grid System" -> " ① Equipment type connected to the GEN port" and set it to "PV Inverter".

② AC  Couple  Enable:  Refer  to  "Part  1  Description  of  Settings  Items  on  the  OSS Interface" - > "8. Advanced Settings" -> "(3) Micro-grid System" - > " ④AC Couple Enable" and set it to "Enable".