Sungrow SG350HX-US User Manual
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Sungrow SG350HX-US User Manual

Pv grid-connected inverter
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User Manual
PV Grid-Connected Inverter
SG350HX-US
SG350HX-USPV
Grid-Connected InverterUser
ManualSG350HX-US-UEN-Ver12-
202301
SG350HX-US-UEN-Ver12-202301

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  • Page 1 User Manual PV Grid-Connected Inverter SG350HX-US SG350HX-USPV Grid-Connected InverterUser ManualSG350HX-US-UEN-Ver12- 202301 SG350HX-US-UEN-Ver12-202301...

  • Page 3: All Rights Reserved

    Software Licenses • It is prohibited to use data contained in firmware or software developed by SUNGROW, in part or in full, for commercial purposes by any means. • It is prohibited to perform reverse engineering, cracking, or any other operations that...

  • Page 4: About This Manual

    Please read this manual carefully before using the product and keep it properly at a place for easy access. All contents, pictures, marks, and symbols in this manual are owned by SUNGROW. No part of this document may be reprinted by the non-internal staff of SUNGROW without written authorization.
  • Page 5 Indicates high-risk potential hazards that, if not avoided, may lead to death or seri- ous injury. Indicates moderate-risk potential hazards that, if not avoided, may lead to death or serious injury. Indicates low-risk potential hazards that, if not avoided, may lead to minor or mod- erate injury.

  • Page 7: Table Of Contents

    Contents All Rights Reserved .....................I About This Manual......................II 1 Safety Instructions ....................1 1.1 Unpacking and Inspection ................2 1.2 Installation Safety ...................2 1.3 Electrical Connection Safety................3 1.4 Operation Safety ....................4 1.5 Maintenance Safety ..................5 1.6 Disposal Safety ....................6 2 Product Description ..................7 2.1 System Introduction ..................7 2.2 Product Introduction..................8...
  • Page 8 4.4.2 Hoisting Transport................23 4.5 Installing Mounting-bracket................25 4.5.1 Bracket-Mounted Installation..............26 4.5.2 Wall-Mounted Installation..............28 4.5.3 Pole-Mounting ..................30 4.6 Installing the Inverter..................33 5 Electrical Connection ..................34 5.1 Safety Instructions ..................34 5.2 Terminal Description ..................36 5.3 Electrical Connection Overview ..............37 5.4 Crimp OT/DT terminal ...................39 5.5 External Protective Grounding Connection .............40 5.5.1 External Protective Grounding Requirements ........40 5.5.2 Connection Procedure.................41...
  • Page 9 7.4 Function Overview..................67 7.5 Home ......................67 7.6 Run Information....................69 7.7 Records .......................71 7.8 More......................73 7.8.1 System Parameters................73 7.8.2 Operation Parameters .................74 7.8.3 Power Regulation Parameters..............75 7.8.4 Communication Parameters..............80 7.8.5 Firmware Update ................81 7.8.6 Password Changing ................82 8 Troubleshooting and Maintenance ..............83 8.1 Troubleshooting ...................83 8.2 Maintenance ....................91...

  • Page 11: Safety Instructions

    Perform operations considering ac- tual onsite conditions. • SUNGROW shall not be held liable for any damage caused by violation of gen- eral safety operation requirements, general safety standards, or any safety in- struction in this manual.

  • Page 12: Unpacking And Inspection

    If there are problems with the above inspection items, do not install the device and contact your distributor first. If the problem persists, con- tact SUNGROW in time. Installation Safety •...

  • Page 13: Electrical Connection Safety

    User Manual 1 Safety Instructions Electrical Connection Safety • Before electrical connections, please make sure that the inverter is not dam- aged, otherwise it may cause danger! • Before electrical connections, please make sure that the inverter switch and all switches connected to the inverter are set to "OFF", otherwise electric shock may occur! The PV string will generate lethal high voltage when exposed to sunlight.

  • Page 14: Operation Safety

    1 Safety Instructions User Manual • Check the positive and negative polarity of the PV strings, and connect the PV connectors to corresponding terminals only after ensuring polarity correctness. • During the installation and operation of the inverter, please ensure that the posi- tive or negative poles of PV strings do not short-circuit to the ground.

  • Page 15: Maintenance Safety

    To avoid the risk of electric shock, do not perform any other maintenance opera- tions beyond this manual. If necessary, contact SUNGROW for maintenance. Oth- erwise, the losses caused is not covered by the warranty.

  • Page 16: Disposal Safety

    1 Safety Instructions User Manual Disposal Safety Please scrap the product in accordance with relevant local regulations and stand- ards to avoid property losses or casualties.

  • Page 17: Product Description

    Monocrystalline silicon, polycrystalline silicon and thin-film PV strings without grounding Inverter SG350HX-US Raises the output voltage of the inverter to a level that meets Transformer the requirements of the grid The grid form supported by the inverter is shown in the figure...

  • Page 18: Product Introduction

    2 Product Description User Manual Product Introduction Model Description The model description is as follows. Appearance The following figure shows the appearance of the inverter. figure 2-2 Appearance The image shown here is for reference only. The actual product received may differ. Description Name To indicate the current working state of the inverter.

  • Page 19: Symbols On Product

    Dimensions The following figure shows the dimensions of the inverter. figure 2-3 Product Dimensions(in mm) Weight Model Weight SG350HX-US ≤ 122 kg Symbols on Product Symbol Explanation Do not dispose of the inverter together with household waste. Read the user manual before maintenance! CSA mark of conformity.

  • Page 20: Led Indicator

    2 Product Description User Manual Symbol Explanation Burn danger due to the hot surface that may exceed 60℃. Danger to life due to high voltages! Do not touch live parts for 5 minutes after disconnection from the power sources. Only qualified personnel can open and maintain the inverter. External protective grounding terminal.

  • Page 21: Dc Switch

    User Manual 2 Product Description Voltage may still be present in AC side circuits after the indicator is off. Pay atten- tion to the electricity safety when operating. DC Switch The inverter is equipped with four DC switches which can safely disconnect it from PV strings.

  • Page 22: Function Description

    2 Product Description User Manual • The AC relay isolates the AC output of the inverter from the grid, making the inverter safe from the grid in case of inverter failure or grid failure. • The AC SPD provides a discharge circuit for the AC side overvoltage to prevent it from damaging the internal circuits of the inverter.

  • Page 23: Unpacking And Storage

    • Check the inner contents for damage after unpacking. Contact SUNGROW or the transport company in case of any damage or incompleteness, and provide photos to facilitate services. Do not dispose of the original packing case. It is recommended to store the device in the original packing case when the product is decommissioned.
  • Page 24 3 Unpacking and Storage User Manual step 2 Remove the packing box upwards. step 3 Remove the surrounding paper angle beads. step 4 Remove the upper cushion.

  • Page 25: Inverter Storage

    User Manual 3 Unpacking and Storage - - End Inverter Storage Proper storage is required if the inverter is not installed immediately. • Store the inverter in the original packing case with the desiccant inside. • The storage temperature must be always between -40℃ and +70℃, and the storage rel- ative humidity must be always between 0 and 95 %, non-condensing.

  • Page 26: Mechanical Mounting

    Mechanical Mounting Respect all local standards and requirements during mechanical installation. Safety During Mounting Make sure there is no electrical connection before installation. Before drilling, avoid the water and electricity wiring in the wall. Poor installation environment will affect system performance! •...

  • Page 27: Location Requirements

    The ambient temperature and relative humidity must meet the following requirements. • Please consult SUNGROW before installing inverters outdoors in salt stress areas. Salt stress areas mainly refer to coastal areas that are within 500 meters from the coast. The deposition of salt fog varies largely with nearby seawater characteristics, sea wind, pre- cipitation, relative humidity, terrain, and forest coverage.

  • Page 28: Carrier Requirements

    4 Mechanical Mounting User Manual • The inverter should be well ventilated. Ensure air circulation. • The inverter generates noise during operation and is not recommended to be installed in living areas. • The inverter should be installed more than 30 m away from third-party wireless communi- cation facilities and living areas.

  • Page 29: Clearance Requirements

    User Manual 4 Mechanical Mounting In case the installation site is a level surface, mount the inverter to the bracket to meet the mounting angle requirements, as shown in the figure below. Take the following items into account when designing the bracket scheme: •...
  • Page 30 4 Mechanical Mounting User Manual The AC cable should be at least vertically led into the AC terminal, and the straight length should be 200 mm. In case of multiple inverters, reserve specific clearance between the inverters. Back-to-Back Installation When installing inverters back-to-back, the distance between every two inverters should be at least 600 mm (recommended).

  • Page 31: Installation Tools

    User Manual 4 Mechanical Mounting Installation Tools Installation tools include but are not limited to the following recommended ones. If necessary, use other auxiliary tools on site. table 4-1 Tool specification Goggles Earplugs Dust mask Safety gloves Safety shoes Utility knife Slotted screwdriver Phillips screwdriver (M2, M3, M6)

  • Page 32: Moving Inverter

    4 Mechanical Mounting User Manual crimping tool(10 Connector wrench Multimeter Vacuum cleaner AWG or 8 AWG) (≥ 1500 Vdc) Model: PV-CZM- 22100 Manufacturer: STAUBLI Scissors Hexagon socket Electric drill wrench (φ12) (T30) Moving Inverter Move the inverters by carrying them manually or using a hoisting tool based on site conditions.

  • Page 33: Manual Transport

    User Manual 4 Mechanical Mounting 4.4.1 Manual Transport Install the four screw-in handles that are provided to the inverter lugs and the base. Lift and move the inverter to the destination by holding the bottom handles and the four installed handles.
  • Page 34 4 Mechanical Mounting User Manual When handling the inverter, do not remove the cushion to avoid damage to the housing or bottom terminals. step 2 Lead the sling through the two lifting rings and fasten the tie-down strap. step 3 Hoist the inverter, and stop to check for safety when the inverter is 100 mm above the ground.

  • Page 35: Installing Mounting-Bracket

    User Manual 4 Mechanical Mounting step 4 Remove the lifting rings and reassemble the sealing screws released in Step 1. Keep the inverter balanced throughout the hoisting process and avoid collisions with walls or other objects. Stop hoisting in the event of severe weather, such as heavy rain, thick fog, or strong wind.

  • Page 36: Bracket-Mounted Installation

    4 Mechanical Mounting User Manual figure 4-1 Dimensions of Mounting-bracket Reserve enough space when installing the mounting-bracket to meet the installation space requirements of the inverter. 4.5.1 Bracket-Mounted Installation Tools Item Specification Phillips screwdriver Marker Level Electric drill Drill bit: φ12 Wrench Opening: 16 mm Spare parts...
  • Page 37 User Manual 4 Mechanical Mounting step 2 Place the assembled mounting-bracket onto the PV bracket. Adjust the angle with a level and mark positions for drilling holes. Drill the holes by using an electric drill. step 3 Secure the mounting-bracket with bolts. (A) Mounting-bracket (B) Full threaded bolt (C) Metal bracket...

  • Page 38: Wall-Mounted Installation

    4 Mechanical Mounting User Manual 4.5.2 Wall-Mounted Installation Tools Item Specification Phillips screwdriver / electric screw driver Marker Level Hammer drill Drill bit: φ12 Wrench Opening: 16 mm Spare parts Item Quantity Specification Source Grub screw M4×10 Delivery scope M10×95 Self-prepared Expansion bolt (Recommended)
  • Page 39 User Manual 4 Mechanical Mounting step 3 Drill the holes by using a hammer drill. Insert the expansion bolts into the holes and secure them with a rubber hammer. Fasten the nut with a wrench to expand the bolt. Remove the nut, spring washer, and flat washer, and store them properly.

  • Page 40: Pole-Mounting

    4 Mechanical Mounting User Manual figure 4-2 Dimensions of Baffle Plate (mm) figure 4-3 Relative Distance Between Baffle Plate and Mounting-bracket (mm) - - End 4.5.3 Pole-Mounting Tools Item Specification Phillips screwdriver — Marker — Level Electric drill * Drill bit: φ12 Wrench Opening: 16 mm * Check whether other tools are needed according to the specification of clamp bolts.
  • Page 41 User Manual 4 Mechanical Mounting Quantity Specification Item Source Delivery scope Grub screw M4×10 Bolt assembly Delivery scope Nut assembly Self-prepared — Self-prepared U-beam Clamp Determined by pole size Self-prepared step 1 Bury the pole into the installation site. Please skip this step if the inverter is to be installed on a concrete post, PV brack- et, etc.
  • Page 42 4 Mechanical Mounting User Manual step 5 Use bolts to secure the mounting-bracket to the U-beam. - - End...

  • Page 43: Installing The Inverter

    User Manual 4 Mechanical Mounting Installing the Inverter Tools Item Specification Phillips screwdriver Spare parts Item Quantity Specification Source Grub screw M6×65 Delivery scope step 1 If the installation position is high, hoist the inverter to the position (refer to "4.4.2 Hoisting Transport").

  • Page 44: Electrical Connection

    Electrical Connection Safety Instructions The PV string will generate lethal high voltage when exposed to sunlight. • Operators must wear proper personal protective equipment during electrical connections. • Must ensure that cables are voltage-free with a measuring instrument before touching DC cables. •...
  • Page 45 User Manual 5 Electrical Connection • Do not damage the ground conductor. Do not operate the product in the ab- sence of a properly installed ground conductor. Otherwise, it may cause per- sonal injury or product damage. • Please use measuring devices with an appropriate range. Overvoltage can dam- age the measuring device and cause personal injury.

  • Page 46: Terminal Description

    5 Electrical Connection User Manual • After being crimped, the OT terminal must wrap the wires completely, and the wires must contact the OT terminal closely. • When using a heat gun, protect the device from being scorched. • Before connecting a power cable (such as the AC cable, the DC cable, etc.), confirm that the label and identifier on the power cable are correct.

  • Page 47: Electrical Connection Overview

    User Manual 5 Electrical Connection Item Terminal Mark Note 24/32, PV connector PV terminals + / - AC wiring — Used for AC output cable connection. terminal Communica- For RS485 communication wiring. COM1 tion terminal DI/DO and CAN wiring, etc Communica- COM2 Communication terminal COM2 is optional,...
  • Page 48 5 Electrical Connection User Manual Specification Type Cable Conductor Cross-sec- tional Area Outdoor four-core copper / alumi- num wire cable Outdoor three-core copper / alu- minum wire cable S: 350 Kcmil~750 Kcmil Outdoor PE cable AC cable ≥ S/2 Four single-core outdoor copper cables Three single-core outdoor alumi- num cables...

  • Page 49: Crimp Ot/Dt Terminal

    User Manual 5 Electrical Connection Crimp OT/DT terminal Crimp OT/DT terminal 1. Heat shrink tubing 2. OT/DT terminal 3. Hydraulic pliers 4. Heat gun Aluminum Cable Requirements If an Aluminum cable is selected, use a copper to Aluminum adapter terminal to avoid direct contact between the copper bar and the Aluminum cable.

  • Page 50: External Protective Grounding Connection

    AC side grounding terminal are reliably grounded. The grounding connection can be made by other means if they are in accordance with the local standards and regulations, and SUNGROW shall not be held liable for the possible consequences.

  • Page 51: Connection Procedure

    User Manual 5 Electrical Connection When there are multiple inverters in the PV system, connect the external protective ground- ing terminals of all inverters and the grounding points of the PV module brackets to ensure equipotential connections to ground cables (according to the onsite conditions). 5.5.2 Connection Procedure step 1 Prepare the cable and OT/DT terminal, refer to "5.4 Crimp OT/DT...
  • Page 52 The apparent power of the inverter should never exceed the power of the transformer. The maximum AC current of all inverters connected in parallel must be taken into ac- count. If more than 15 inverters are connected to the grid, contact SUNGROW.
  • Page 53 User Manual 5 Electrical Connection • The transformer must be protected against overloading and short circuit. • The transformer is an important part of grid-connected PV generation system. The fault tolerance capacity of the transformer should be taken into account at all times. The fault include: system short circuit, grounding fault, voltage drop, etc.

  • Page 54: Requirements For Ot/Dt Terminal

    5 Electrical Connection User Manual – The string serial communication box EMU200 requires an external power supply of 220 Vac, so a power supply port and an input port (including switches) should be re- served in the LV power distribution room of the boost transformer. 5.6.2 Requirements for OT/DT Terminal OT/DT terminals (not included in the delivery scope) are required for fixing AC cables to the terminal block.
  • Page 55 User Manual 5 Electrical Connection The screws on the front cover of the junction box are captive screws, which will re- main on the front cover when the cover is open to avoid screw loss. step 3 Install an appropriate conduit. step 4 Lead the cable with the protective layer removed through the conduit.
  • Page 56 5 Electrical Connection User Manual step 5 Open the protection cover. step 6 Fix cables with crimped OT/DT terminals to corresponding terminals.
  • Page 57 User Manual 5 Electrical Connection Ensure that the depth L of the socket used is not less than 28 mm. step 7 Close the protection cover.

  • Page 58: Dc Cable Connection

    5 Electrical Connection User Manual step 8 Remove the limit rod and place it in place. Close the junction box and tighten the two screws on its front cover with the hexagon socket wrench provided. - - End DC Cable Connection The PV string will generate lethal high voltage when exposed to sunlight.

  • Page 59: Pv Input Configuration

    User Manual 5 Electrical Connection • Make sure the PV array is well insulated to ground before connecting it to the inverter. • Make sure the maximum DC voltage and the maximum short circuit current of any string never exceed inverter permitted values specified in "Technical Data". •...
  • Page 60 MPPT is connected with at least one string. Taking SG350HX-US (Version 182, 16 MPPT) as an example, each MPPT among MPPT1 ~ MPPT16 should be connected with at least one PV string. The number of PV strings and the...
  • Page 61 User Manual 5 Electrical Connection Num- Num- ber of ber of String- String- DC Terminals DC Terminals Connect to PV1, PV3, PV5, PV7, Connect to PV1~PV3, PV5, PV9, PV11, PV13, PV15, PV17, PV7, PV9, PV11, PV13, PV15, PV19, PV21, PV23, PV25~PV32 PV17, PV19, PV21, PV23, PV25~PV32 Connect to PV1~PV5, PV7, PV9,...

  • Page 62: Assembling Pv Connectors

    5 Electrical Connection User Manual Num- Num- ber of ber of String- String- DC Terminals DC Terminals Connect to PV1~PV21, PV23, Connect to PV1~PV23, PV25~PV32 PV25~PV32 Connect to PV1~PV32 5.7.2 Assembling PV Connectors High voltage may be present in the inverter! •...

  • Page 63: Installing Pv Connector

    User Manual 5 Electrical Connection step 2 Assemble the cable ends with the crimping pliers. 1: Positive crimp contact 2：Negative crimp contact step 3 Lead the cable through the cable gland, and insert the crimp contact into the insulator until it snaps into place.
  • Page 64 5 Electrical Connection User Manual step 2 Check the cable connection of the PV string for polarity correctness and ensure that the open circuit voltage in any case does not exceed the inverter input limit of 1,500V. The multimeter must have a DC voltage range of at least 1,500 V. If the voltage is a negative value, the DC input polarity is incorrect.

  • Page 65: Rs485 Connection(Com1)

    User Manual 5 Electrical Connection RS485 Connection(COM1) 5.8.1 Interface Description The inverter communication terminal COM1 is located at the bottom of the inverter, as shown in the figure below. table 5-2 COM1 Terminal Definition Description Port Definition RS485A IN, RS485 differential sig- nal+ RS485A IN, RS485 differential sig- Used for cascading in-...

  • Page 66: Connection Procedure

    5 Electrical Connection User Manual Multi-inverter Communication System In case of multiple inverters, all the inverters can be connected via RS485 cables in the daisy chain manner. The communication cable of the tracking system can be connected to the port RS485_2 of any inverter in the daisy chain. (A) Inverter (B) Data Logger (C) PC...
  • Page 67 User Manual 5 Electrical Connection step 3 Select a seal according to the cable outer diameter. Lead the cable through the swivel nut, seal and the cable gland. step 4 Strip the protective layer and the insulation layer of the cable to proper length. step 5 Secure the wires to corresponding terminals.
  • Page 68 5 Electrical Connection User Manual step 6 Pull cables outwards to confirm whether they are fastened firmly, then tighten the swivel nut with appropriate torque. step 7 Remove the waterproof lid from the communication terminal COM1. step 8 Insert the connector into the communication terminal.

  • Page 69: Plc Communication Connection

    PLC Communication Connection With a PLC communication module built inside, the inverter can communicate with the Data Logger provided by SUNGROW. For specific wiring method, refer to the user manual for the data logger. The maximum PLC communication distance from the box-type substation to the inverter is: •...
  • Page 70 If there is one wire per phase, with multi-core cable, the maximum communication dis- tance is 1000 m. • The Data Logger is an optional device that can be ordered from SUNGROW. • The Data Logger conducts data communication by directly using the AC output cable of the inverter and thus saves the trouble to lay and maintain the special communication cables.

  • Page 71: Commissioning

    Commissioning Inspection Before Commissioning Check the following items before starting the inverter: • All equipment has been reliably installed. • DC switch(es) and AC circuit breaker are in the "OFF" position. • The ground cable is properly and reliably connected. •...
  • Page 72 6 Commissioning User Manual step 2 Close the AC circuit breaker between the inverter and the grid. step 3 Install the iSolarCloud App, see "7.2 Installing App" for details. step 4 Set initial protection parameters via the iSolarCloud App when the inverter is connected to the grid for the first time (see Step 4 in "7.3.2 Login Procedure"...

  • Page 73: Isolarcloud App

    iSolarCloud App Brief Introduction The iSolarCloud App can establish communication connection to the inverter via the Blue- tooth, thereby achieving near-end maintenance on the inverter. Users can use the App to view basic information, alarms, and events, set parameters, or download logs, etc. Screenshots in this manual are based on the Android system V2.1.6 , and the ac- tual interfaces may differ.

  • Page 74: Login

    7 iSolarCloud App User Manual Login 7.3.1 Requirements The following requirements should be met: • The AC or DC side of the inverter is powered-on. • The mobile phone is within 5 meters away from the inverter and there are no obstructions in between.
  • Page 75 User Manual 7 iSolarCloud App figure 7-1 Bluetooth Connection step 3 Enter the identity verification interface after the Bluetooth connection is established.
  • Page 76 If the dis- tributor is unable to provide the required information, contact SUNGROW. step 4 If the inverter is not initialized, you will enter the quick setting interface of initializing protec- tion parameter.

  • Page 77: Function Overview

    User Manual 7 iSolarCloud App - - End Function Overview The App provides parameter viewing and setting functions, as shown in the following figure. figure 7-4 App Function Tree Map Home After login, the home page is as follows:...
  • Page 78 7 iSolarCloud App User Manual figure 7-5 Home Page table 7-1 Home Page Description Designation Description System date and time of the inverter Date and time Present operation state of the inverter. For details, refer to Inverter state "table 7-2 Description of Inverter State".

  • Page 79: Run Information

    User Manual 7 iSolarCloud App table 7-2 Description of Inverter State Description State After being energized, inverter tracks the PV arrays’ maximum power point (MPP) and converts the DC power into AC power. This is the nor- mal operation mode. Stop Inverter is stopped.
  • Page 80 7 iSolarCloud App User Manual table 7-4 Run Information Classifica- Description Parameter Name tion String n Voltage The input voltage of String n String n Current The input current of String n Information Total On-grid Run- ning Time Daily On-grid Run- ning Time Negative Voltage to Inverter DC side negative to ground voltage value...

  • Page 81: Records

    User Manual 7 iSolarCloud App Classifica- Description Parameter Name tion Phase C Current Records Tap Records on the navigation bar to enter the interface showing event records, as shown in the following figure. figure 7-6 Records Fault Alarm Record Tap Fault Alarm Record to enter the interface, as shown in the following figure. figure 7-7 Fault Alarm Record to select a time segment and view corresponding records.
  • Page 82 7 iSolarCloud App User Manual figure 7-8 Detailed Fault Alarm Information Yield Record Tap Yield Record to enter the interface showing daily power generation as shown in the fol- lowing figure. figure 7-9 Power Curve The App displays power generation records in a variety of forms, including daily power gen- eration histogram,, monthly power generation histogram, annual power generation histo- gram and total power generation histogram.

  • Page 83: More

    User Manual 7 iSolarCloud App Description Parameter Monthly yield Shows the power output every month in a year. histogram Annual yield Shows the power output every year. histogram Tap the time bar on the top of the interface to select a time segment and view the corre- sponding power curve.

  • Page 84: Operation Parameters

    7 iSolarCloud App User Manual figure 7-11 System Parameters * The image shown here is for reference only. Boot/Shutdown Tap Boot/Shutdown to send the boot/shutdown instruction to the inverter. Date Setting/Time Setting The correct system time is very important. Wrong system time will directly affect the data logging and power generation value.

  • Page 85: Power Regulation Parameters

    User Manual 7 iSolarCloud App figure 7-13 PID Parameters table 7-6 PID Parameter Description Description Parameter Availability of Q at If this switch is turned on, PID recovery and Q at night can be en- Night during PID abled at the same time, but can not work at the same time. Recovery Enable/Disable the PID night recovery function.
  • Page 86 7 iSolarCloud App User Manual figure 7-14 Active Power Regulation table 7-7 Active Power Regulation Definition/Setting Range Parameter Description The switch for enabling/dis- Active Power Soft abling the soft start function Enable/Disable Start after Fault after a fault occurs. Time that the soft start takes to Active Power Soft raise the power from 0 to 1s~1200s...
  • Page 87 User Manual 7 iSolarCloud App Definition/Setting Range Parameter Description Select whether to shut down Shutdown When Ac- the inverter when the limited Enable/Disable tive Power Limit to 0% power reaches 0. Switch used to ensure that the 100% Scheduling to inverter operates at the maxi- achieve active mum active power when the...
  • Page 88 7 iSolarCloud App User Manual table 7-9 “Q(P)” Mode Parameter Descriptions: Definition/Setting Description Range Parameter Reactive Switch for enabling/disabling reactive Enable/Disable Response response Reactive Re- Completion time of reactive response 0.1s~600.0s sponse Time Select corresponding curve according to Q(P) Curve A, B, C local regulations Output power at P1 on the Q(P) mode...
  • Page 89 User Manual 7 iSolarCloud App figure 7-15 Q(P) Curve “Q(U)” Mode table 7-10 “Q(U)” Mode Parameter Descriptions: Definition/Setting Description Range Parameter Switch for enabling/disabling reactive Reactive Response Enable/Disable response Reactive Response Completion time of reactive response 0.1s~600.0s Time Select corresponding curve according to lo- Q(U) Curve A, B, C cal regulations...

  • Page 90: Communication Parameters

    7 iSolarCloud App User Manual Definition/Setting Description Range Parameter QU_ExitPower Active power for Q(U) function deactivation 1% ~ 20% Unconditional activation/deactivation of Q Yes / No / Yes, QU_EnableMode (U) function Limited by PF QU_Limited PF PF value for Q(U) function activation 0~1.00 Value * Curve C is reserved and consistent with Curve A currently.

  • Page 91: Firmware Update

    User Manual 7 iSolarCloud App figure 7-18 MPLC Parameters table 7-12 MPLC Parameters Range Parameter Band Num Band1, Band2 Array ID 1–255 Winding ID 1–10 7.8.5 Firmware Update To avoid download failure due to poor on-site network signal, it is recommended to download the firmware package to the mobile device in advance.

  • Page 92: Password Changing

    7 iSolarCloud App User Manual step 9 Wait for the file to be uploaded. When the upgrade is finished, a message is displayed indi- cating that the upgrade is completed. Tap Complete to end the upgrade. - - End 7.8.6 Password Changing Tap Modify Password to enter the modify password interface, as shown in the following figure.

  • Page 93: Troubleshooting And Maintenance

    App or the LCD. Modify the overvoltage protection values with the con- sent of the local electric power operator. 3. Contact Sungrow Customer Service if the pre- ceding causes are ruled out and the fault persists. Generally, the inverter will be reconnected to the grid after the grid returns to normal.
  • Page 94 2. Check whether the protection parameters are appropriately set via the App or the LCD. 3. Contact Sungrow Customer Service if the pre- ceding causes are ruled out and the fault persists. Generally, the inverter will be reconnected to the grid after the grid returns to normal.
  • Page 95 App or the LCD. 3. Contact Sungrow Customer Service if the pre- ceding causes are ruled out and the fault persists. 1. Check whether the corresponding string is of reverse polarity.
  • Page 96 3. Check if the DC fuse is damaged. If so, replace Alarm the fuse. 4. Contact Sungrow Customer Service if the pre- ceding causes are ruled out and the alarm persists. *The code 548 to code 563 are corresponding to string 1 to string 16 respectively.
  • Page 97 If so, replace the dam- aged cable and secure terminals to ensure a reli- able connection. 5. Contact Sungrow Customer Service if the pre- ceding causes are ruled out and the fault persists. 1. Check whether the AC cable is correctly connected.
  • Page 98 2. Reconnect the communication cable of the cation Abnormal meter. Alarm 3. Contact Sungrow Customer Service if the pre- ceding causes are ruled out and the alarm persists. 1. Check whether the output port is connected to actual grid. Disconnect it from the grid if so.
  • Page 99 Close the AC and DC switches in turn 15 248–255, 300– minutes later and restart the system. 322, 324–328, 3. Contact Sungrow Customer Service if the pre- 401–412, 600– ceding causes are ruled out and the fault persists. 603, 605, 608, 612, 616, 620, 622–624, 800,...
  • Page 100 Close the AC and DC switches in turn 15 364-395 minutes later and restart the system. Overvoltage Fault 2. If the fault persists, please contact Sungrow Power Customer Service. 1. Check whether the number of PV modules of the corresponding string is less than other strings.

  • Page 101: Maintenance

    DC side current drops below 0.5 A. 3. It is prohibited to power up the inverter again. Please contact Sungrow Customer Service. Contact SUNGROW if the measures listed in the “Troubleshooting Method” col- umn have been taken but the problem persists. Maintenance 8.2.1 Maintenance Notices...

  • Page 102: Disconnecting Inverter

    • To avoid the risk of electric shock, do not perform any other maintenance oper- ations beyond this manual. If necessary, contact SUNGROW for maintenance. Otherwise, the losses caused is not covered by the warranty. Touching the PCB or other static sensitive components may cause damage to the device.

  • Page 103: Routine Maintenance

    User Manual 8 Troubleshooting and Maintenance step 1 Disconnect the external AC circuit breaker and prevent it from inadvertent reconnection step 2 Rotate the DC switch to the "OFF" position for disconnecting all of the PV string inputs. step 3 Wait about 5 minutes until the capacitors inside the inverter completely discharge. step 4 Ensure that the DC cable is current-free with a current clamp.

  • Page 104: Fan Maintenance

    8 Troubleshooting and Maintenance User Manual Clean the air inlet and outlet with soft brush or vacuum cleaner if necessary. 8.2.5 Fan Maintenance • Power off the inverter and disconnect it from all power supplies before main- taining fans. • After the inverter is powered off for 5 minutes, measure the voltage and current with professional instrument.
  • Page 105 User Manual 8 Troubleshooting and Maintenance step 4 Loosen screws on the sides of fans. step 5 Pull out the fans. Clean them with a soft brush or vacuum cleaner, and replace them when necessary.

  • Page 106: Heat Sink Cleaning

    8 Troubleshooting and Maintenance User Manual If there is not enough space, pull out part of the fans and remove the screws be- tween the two fans. - - End 8.2.6 Heat Sink Cleaning • Power off the inverter and disconnect it from all power supplies before cleaning the heat sink.

  • Page 107: Inverter Disposal

    User Manual 8 Troubleshooting and Maintenance step 3 Use a soft brush or a vacuum cleaner to clean the heat sink. step 4 After cleaning the heat sink, install the fan and the rear cover plate in reverse steps. - - End Inverter Disposal 8.3.1 Dismantling the Inverter Risk of burn injuries and electric shock!

  • Page 108: Disposal Of Inverter

    8 Troubleshooting and Maintenance User Manual • Before dismantling the inverter, disconnect the inverter from both AC and DC power sources. • If there are more than two layers of inverter DC terminals, dismantle the outer DC connectors before dismantling the inner ones. •...

  • Page 109: Appendix

    Appendix Technical Data Parameters SG350HX-US Input (DC) Max. PV input voltage 1500 V Min. PV input voltage / Startup input 500 V / 550 V voltage Nominal PV input voltage 1080 V MPP voltage range 500 V – 1500 V No.

  • Page 110: Wring Distance Of Di Dry Contact

    9 Appendix User Manual Parameters SG350HX-US PV string current monitoring Q at night function Anti-PID and PID recovery function Optional Surge protection DC Type II / AC Type II General Data Dimensions (W*H*D) 1165 * 870 * 361 mm (45.9'' * 34.3'' * 14.2'') Weight ≤122 kg(≤269 lbs)
  • Page 111 User Manual 9 Appendix refers to the cable length in one direction between the DI dry contact terminal of the k verter and the corresponding terminal of the (k-1) inverter. table 9-1 Correspondence Between Inverter Quantity and Maximum Wiring Distance Maximum Wiring Distance(unit:m) Number of Inverter...

  • Page 112: Quality Assurance

    • The customer shall give SUNGROW a reasonable period to repair the faulty device. Exclusion of Liability In the following circumstances, SUNGROW has the right to refuse to honor the quality guarantee: • The free warranty period for the whole machine/components has expired.
  • Page 113 User Manual 9 Appendix We need the following information to provide you the best assistance: • Model of the device • Serial number of the device • Fault code/name • Brief description of the problem For detailed contact information, please visit: https://en.sungrowpower.com/contactUS...
  • Page 114 Sungrow Power Supply Co., Ltd. www.sungrowpower.com...

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