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SUN2000-(175KTL-H0, 185KTL-INH0, 185KTL-H1) User Manual

This document describes the SUN2000-175KTL-H0,SUN2000-185KTL-INH0, and SUN2000-185KTL-H1 in terms of their installation, electrical connections, commissioning, maintenance, and troubleshooting. BOM number: 01074671, 01074684, 01074687
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String Access Detection

String Access Detection

Function Description

  • Applies to large-scale commercial ground PV plants with PV strings facing the same direction.
  • In AC or DC power limiting scenarios:
    • If the PV string access type is not identified, the value of String access type will keep being displayed as Not connected. The PV string access type can be identified only when the inverters restore to the non-power limiting state and the current of all connected PV strings reaches the startup current.
    • If the PV string access type has been identified, when some PV strings connected to the 2-in-1 terminals are lost, no alarm will be generated. If some PV strings connected to the 2-in-1 terminals are restored, the access type cannot be identified. It can be determined whether all the 2-in-1 PV strings are restored only when the string current reaches Startup current for 2 in 1 detection.


  1. Log in to the SUN2000 app as Advanced User. The initial password is 00000a.


    Use the initial password upon first power-on and change it immediately after login. To ensure account security, change the password periodically and keep the new password in mind. Not changing the initial password may cause password disclosure. A password left unchanged for a long period of time may be stolen or cracked. If a password is lost, devices cannot be accessed. In these cases, the user is liable for any loss caused to the PV plant.

  2. Choose Function Menu > Maintenance > String Access Detection to go to the parameter setting screen.

    Figure A-1 String Access Detection







String Access Detection

The default value is Disable. After the inverter is connected to the power grid, you can set String Access Detection to Enable.



Startup current

When the current of all connected PV strings reaches the preset value, the PV string connection detection function is enabled.


Startup current setting rules:

  • Startup current = Isc (Stc) × 0.6 (rounded up). For details about Isc (Stc), see the PV module nameplate.
  • Default startup current (5 A): applicable to the scenarios where the short-circuit current Isc (Stc) is greater than 8 A for the monocrystalline and polycrystalline PV modules.

This parameter is displayed only when String Access Detection is set to Enable.


Startup current for 2 in 1 detection

When the current of a PV string reaches Startup current for 2 in 1 detection, the PV string is automatically identified as 2 in 1.

You are advised to use the default value.


PV string N access type


N is the DC input terminal number of the inverter.

Set this parameter based on the type of the PV string connected to DC input terminal N of the inverter. Currently, the options are as follows: Automatic identification (default value), Disconnection, Single PV string, and 2 in 1.

You are advised to retain the default value. If the value is incorrectly set, the PV string access type may be incorrectly identified and alarms may be generated by mistake for the PV string connection status.

Updated: 2019-09-21

Document ID: EDOC1100083285

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