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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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Installing the DC Input Power Cable

Installing the DC Input Power Cable


  • Before connecting the DC input power cable, ensure that the DC voltage is within the safe range (lower than 60 V DC) and that the three DC switches on the inverter are set to OFF. Failure to do so may result in electric shocks.
  • When the inverter operates in grid-tied mode, do not perform maintenance or operations on the DC circuit, such as connecting or disconnecting a PV string or a PV module in the PV string. Failure to do so may cause electric shocks or arcing, which may also cause fire.

Ensure that the following conditions are met. Otherwise, the inverter may be damaged, or even a fire could happen.

  • The open-circuit voltage of each PV string must always be 1500 V DC or lower.
  • The polarities of electric connections are correct on the DC input side. The positive and negative terminals of a PV module connect to corresponding positive and negative DC input terminals of the inverter.
  • Ensure that the PV module output is well insulated to ground.
  • The PV strings connecting to the same MPPT circuit should contain the same number of identical PV modules.
  • During the installation of PV strings and the inverter, the positive or negative terminals of PV strings may be short-circuited to ground if the power cable is not properly installed or routed. In this case, an AC or DC short circuit may occur and damage the inverter. The caused device damage is not covered under any warranty.

Terminal Description

The inverter provides 18 DC input terminals, which are controlled by its three DC switches. DC SWITCH 1 controls DC input terminals 1–6, DC SWITCH 2 controls DC input terminals 7–12, and DC SWITCH 3 controls DC input terminals 13–18.

Figure 5-10 DC terminals

Requirements for selecting DC input terminals:

  1. Evenly distribute the DC input power cables on the DC input terminals controlled by the three DC switches.
  2. Maximize the number of connected MPPT circuits.
  3. When the DC input is not fully configured, give preference to even-numbered DC input terminals.

Wiring Description of Y-branch Connectors

  • When connecting cables using Y-branch connectors, ensure that all connectors are of the same model provided by the same vendor.
  • If connectors of different vendors are connected to each other or different types of connectors of the same vendor are connected to each other without permission, the contact resistance of the connectors will exceed the allowed value. As a result, the connectors will be heated and oxidized continuously, which is prone to faults.
Wiring rules:
  1. A maximum of one set of Y-branch connectors can be used for each MPPT.
  2. The PV+ on the inverter side must be connected to the PV+ on the PV string side, and the PV– on the inverter side must be connected to the PV– on the string side.
    Figure 5-11 Wiring diagram (with Y-branch connectors connected to the inverter)
    Figure 5-12 Wiring diagram (with Y-branch connectors connected to the PV modules)

Cable Specifications

Cable Type

Conductor Cross-sectional Area (Unit: mm2)

Cable Outer Diameter (Unit: mm)

PV cable that meets the 1500 V standard



Cables with high rigidity, such as armored cables, are not recommended, because poor contact may be caused by the bending of cables.


Use the MC4 EVO2 PV connectors delivered with the inverter. If the PV connectors are lost or damaged, purchase the connectors of the same model. The device damage caused by incompatible PV connectors is beyond the warranty scope.

  1. Install the DC input power cable.

    • The DC voltage measurement range of the multimeter must be at least 1500 V.
    • If the voltage is a negative value, the DC input polarity is incorrect and needs correction.
    • If the voltage is greater than 1500 V, too many PV modules configured to the same string. Remove some PV modules.
    Figure 5-13 Cable connection

Updated: 2019-09-21

Document ID: EDOC1100083285

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