Sunways Stt-6ktl User manual

Grid-connected PV Inverter

Three Phase Dual MPPT

STT-6K/8K/10K/12K/15K/17K/20K/25KTL

User Manual

Ningbo Sunways Technologies Co., Ltd.

CONTENTS

1.Preface ........................................................................................................................ 5

1.1 Overview ....................................................................................................... 5

1.2 Target Groups ...............................................................................................5

2.Safety Instructions ................................................................................................5

2.1 Safety Notes .................................................................................................5

2.2 Statement .....................................................................................................5

2.3 Important Safety Matters ............................................................................6

2.4 Symbols Explanation ...................................................................................7

3. Product Introduction ..........................................................................................9

3.1 Basic Features ..............................................................................................9

3.2 Appearance Introduction ..........................................................................10

3.3 Display Interface ........................................................................................12

3.4 Packing List .................................................................................................13

4. Product Installation ........................................................................................... 13

4.1 Selection of Installation Location .............................................................13

4.2 Mounting the Inverter ................................................................................15

4.3 Electrical Connection ................................................................................17

4.4 Monitoring Device Installation ..................................................................22

4.5 System Layout of Units Without Integrated DC Switch ...........................23

5. Start and Stop ......................................................................................................24

5.1 Start Inverter ..............................................................................................24

5.2 Stop Inverter ..............................................................................................24

6. General Operation ..............................................................................................25

6.1 Display Operation .....................................................................................25

7.Troubleshooting ...................................................................................................26

7.1 Fault Messages ..........................................................................................26

8. Technical Parameters .......................................................................................27

1.Preface

1.1 Overview

This manual is an integral part of Sunways STT 6-25kW series three-phase inverters (hereinafter

referred to as the inverters). It mainly introduces the assembly, installation, electrical

connection, debugging, maintenance and troubleshooting of the products. Before installing

and using inverters, please read this manual carefully, understand the safety information and

be familiar with the functions and characteristics of inverters.

1.2 Target Groups

This manual is applicable to the electrical installers with professional qualifications and

the people who bought it. If there are any problems in the installation process, please call

Sunways service telephone at +86 400-9922-958 or email Sunways at service@sunways-tech.

com for consultation.

2.Safety Instructions

2.1 Safety Notes

2.1.1 Before installation, you should read this manual carefully and follow the instructions in

this manual strictly.

2.1.2 Installation operators need to undergo professional training or obtain electrical related

professional quali󽗉cation certi󽗉cates.

2.1.3 When installing, do not touch any part of the inner part of the inverter except the

terminals.

2.1.4 All electrical installations must conform to local electrical safety standards.

2.1.5 If the inverter needs maintenance, please contact the local designated personnel for

system installation and maintenance.

2.1.6 To use this grid-connected inverter for power generation needs the permission of the

local power supply authority.

2.1.7 During the operation of the inverter, the surface temperature may be higher and there is

a risk of burns. Do not touch.

2.1.8 When installing photovoltaic panels in the daytime, the photovoltaic panels should be

covered with opaque materials to avoid the risks and danger of high voltage at the panel end

in sunlight.

2.2 Statement

Ningbo Sunways technologies Co., Ltd. has the right not to undertake quality assurance in any

of the following circumstances:

2.2.1 Damages caused by irregular transportation.

Attention

The products, services or features you purchase are subject to the commercial

contracts and terms of Ningbo Sunways technologies Co., Ltd. All or part of the

products, services or features described in this document may not be within your

purchasing or using scope. Unless otherwise agreed in the contract, the Company

shall not make any express or implied declaration or guarantee of the contents of this

document.

Due to product version upgrades or other reasons, the contents of this document will

be updated periodically. Unless otherwise agreed, this document serves only as a

guide to use, and all statements, information and recommendations in this document

do not constitute any express or implied guarantee.

Manufacturer: Ningbo Sunways technologies Co., Ltd.

Address: No. 1, Second Road, Green Industrial Zone, Chongshou Town,

Cixi City, ZheJiang Province, PEOPLE’S REPUBLIC OF CHINA

Website: www.sunways-tech.com

Service Mail: service@sunways-tech.com

Hotline: +86 400-9922-958

2.2.2 Damages caused by incorrect storage, installation or use.

2.2.3 Damages caused by installation and use of equipment by non-professionals or untrained

personnel.

2.2.4 Damages caused by failure to comply with the instructions and safety warnings in the

products and documents.

2.2.5 Damages caused by running in an environment that doesn't meet the requirements

which stated in the documents.

2.2.6 Damages caused by operation beyond the parameters speci󽗉ed in applicable technical

speci󽗉cations.

2.2.7 Damages caused by unauthorized disassembly, alteration of products or modi󽗉cation of

software codes.

2.2.8 Damages caused by abnormal natural environment (force majeure, such as lightning,

earthquake, 󽗉re, storm, etc.).

2.2.9 Any damages caused by the process of installation and operation which don’t follow the

local standards and regulations.

2.2.10 Products beyond the warranty period.

2.3 Important Safety Matters

The following symbols may appear in this manual, which represent the following meanings:

2.4 Symbols Explanation

This chapter mainly elaborates the symbols displayed on the inverter, nameplate and packing

box.

2.4.1 Symbols on the Inverter

DescriptionSymbol

Inverter running indicator.

Grounding symbol, the inverter casing needs to be properly

grounded.

Danger

Warning

Caution

Used to warn of urgent dangerous situations, if not avoided, it

could result in death or serious personal injury.

DescriptionSymbol

Used to warn of potentially dangerous situations, if not

avoided, it may result in death or serious personal injury.

Used to warn of potentially dangerous situations, if not

avoided, it may result in moderate or minor personal injury.

Attention

Used to transmit the safety warning information about

equipment or environment, if not avoided, it may cause

equipment damage, data loss, equipment performance

degradation or other unpredictable results. "Attention" does

not involve personal injury.

Note Used to highlight important information, best practices and

tips, etc. it's not warning, doesn't involve personal injury and

equipment damage information.

2.4.2 Symbol on the Inverter nameplate

The inverter cannot be disposed of with household waste.

DescriptionSymbol

Please read the instructions carefully before installation.

Do not touch any internal parts of the inverter until 5 min after

being disconnected from the mains and PV input.

CE mark, the inverter complies with the requirements of the

applicable CE guidelines.

Danger. Risk of electric shock!

TUV certi󽗉cation.

The surface is hot during operation and no touch is allowed.

Electric shock hazard, it is strictly forbidden to use the person

to disassemble the inverter casing.

Inverter status indicator.

Handle with care.

Description

Symbol

This side up.

Keep dry.

Stacked layers.

2.4.3 Symbol on the Packing box

Sunways

STT Series

Sunways

STT Series

Sunways

STT Series

Sunways

STT Series

Sunways

STT Series

TN-C-S

TN-S TN-C

3. Product Introduction

3.1 Basic Features

3.1.1 Function

The Sunways STT6~25kW series is a three-phase grid-connected PV inverter which used to

e󽗋ciently convert the DC power generated by the PV string into AC power and feed it into the

grid.

3.1.2 The STT 6~25kW series inverter contains 8 models which are listed below:

STT-6KTL, STT-8KTL STT-10KTL, STT-12KTL, STT-15KTL, STT-17KTL, STT-20KTL, STT-25KTL

3.1.3 Applicable grid type

The applicable grid types for the Sunways STT 6~25kW series are TN-S, TN-C, TN-C-S, IT and

TT. When applied to the TT grid, the voltage of N to PE should be less than 30V. See Figure 3-1

for details:

3.1.4 Storage conditions

1) Inverter must be stored in its original packaging.

2) The storage temperature should be in the range of -30 ° C and + 60 ° C, and the relative

humidity stored is less than 90%.

3) If a batch of inverters needs to be stored, the height of each pile should be no more

than 6 levels.

Transformer Transformer Transformer

Transformer Transformer

Figure 3-1 Applicable grid type

Figure 3- 2 Front view

Figure 3- 3 Side view

3.2 Appearance Introduction

3.2.1 Inverter front view, as shown in Figure 3- 2:

3.2.2 Inverter side view, as shown in Figure 3-3:

Figure 3-4 Bottom view

Figure 3-5 Inverter back view

3.2.3 Inverter bottom view, as shown in Figure 3- 4:

3.2.4 Inverter back view, as shown in Figure 3- 5:

410mm

175mm

Name

Plate

175mm

DC Switch

DC Input Terminal

Back Rail

Com Port

AC Output Terminal

Back Rail

Vent Valve

Logo

Display

550mm

410mm

Item Indicator Status Description

1Power

Indicator

O󽗈 No input voltage detected or input voltage is too low.

Slow 󽗊ashing Inverter powered on, waiting for the grid connection.

Quick 󽗊ashing Inverter detected grid power and entered self-test status.

Always on Normal, grid-connected and power generated.

2Alarm

Indicator

Always on An alarm or fault is detected, and the display can view the

speci󽗉c fault information.

O󽗈 The inverter is running normally.

Slow 󽗊ashing The monitoring device is not connected to the router or is

not connected to the base station.

Quick 󽗊ashing

The monitoring device is connected to the router or

connected to the base station but not connected to the

server.

3OLED

Display

On Display the inverter operating information.

O󽗈 If the button pressed without any response, the screen is

faulty or not well connected.

4Button Physical button Switch OLED display information and set parameters by

short press and long press.

sunways

3.3 Display Interface

Figure 3-6 Display interface

Inspection Report

Quick Guide

Grid Licence

Inverter × 1 Wall Bracket × 1 Expansion Bolt × 5 2Pin Terminal × 1 ①PV Terminal × 2 ②

Figure 3- 7 Packing list

3.4 Packing List

The package of the inverter includes the following accessories. Please check whether the

accessories in the packing box are complete at the 󽗉rst time when receiving the goods. See

Figure 3-7 for the packing list:

4. Product Installation

4.1 Selection of Installation Location

The Sunways STT 6~25kW series is designed with IP65 protection for indoor and outdoor

installations. When selecting an inverter installation location, the following factors should be

considered:

1) The wall on which the inverter is mounted must be strong and can withstand the weight of the

inverter for a long time.

2) The inverter needs to be installed in a well-ventilated environment.

3) Do not expose the inverter directly to strong sunlight to prevent the power derating due to

excessive temperature.

4) The inverter should be installed in a place with shelter to prevent direct exposure to sunlight

and rain.

5) Install the inverter at the eye level for easy inspection of screen data and further maintenance.

6) The ambient temperature of the inverter installation location should be between -30 ° C and

60 ° C.

7) The surface temperature of the inverter may reach up to 75 ° C. To avoid risk of burns, do not

touch the inverter while it’s operating and inverter must be installed out of reaching of children.

4.1.1 Recommended installation location of the inverter, as shown in Figure 4-1:

WiFi/GPRS(Optional) AC Terminal × 1 Ground Terminal × 1 6Pin Terminal × 1

Australia only

User Manual × 1

Quick Guide × 1

Inspection Report × 1

Grid Connection Licence 1

Note ①Only for inverter integrated with Anti-reverse function.

②STT 6-12kW 2pcs / STT 15kW 3pcs / STT 17-25kW 4pcs.

4.1.2 The requirements for inverter installation spacing are shown in Figure 4-2:

Figure 4-1 Recommended installation

Figure 4-2 Recommended installation space

Figure 4-3 Recommended installation angle

Do not put 󽗊ammable and explosive articles around the inverter.

Warning

4.2 Mounting the Inverter

4.2.1 Wall bracket installation

Dimensions of wall bracket, see Figure 4-4:

1) Use the wall bracket as the template to mark the position of 5 holes on the wall. See Figure

4-5 for details:

Figure 4-4 Dimensions of wall bracket

Figure 4-5 Mark the hole position

500mm

300mm

300mm 300mm

4.1.3 The installation angle of the inverter is recommended as shown in Figure 4-3:

150mm

300mm

150mm

150mm150mm

FRONT

Figure 4-6 Fix the wall bracket

Figure 4-7 Mounting the inverter

Before drilling, make sure to avoid the buried water tube and

electric wires in the wall to avoid danger.

2) Use an electrical driller with 10mm diameter bit to drill 5 holes on the wall and make sure

hole depth is 80mm.

3) Insert the expansion tubes into the holes and tighten them, then 󽗉x the bracket onto the

wall with expansion screws by using a cross screwdriver, as shown in Figure 4-6:

4.2.2 Mounting the inverter

Lift up the inverter with both hands, hang the back rail on the 󽗉xed wall bracket carefully, see

Figure 4-7 for details:

Warning

4.3 Electrical Connection

Danger hint

4.3.1 Inverter PV string connection

4.3.1.1 The following principles must be considered when making electrical connections to the

inverter:

1) Disconnect the AC breaker on the grid side.

2) The DC switch of the inverter must be turned to the "OFF" position.

3) The number and type of the PV panels connected in the two strings of one MPPT must be

same.

4) Make sure the maximum output voltage of each PV string does not exceed 1100V.

4.3.1.2 DC connector assembly procedures

2) Peel o󽗈 the DC cable insulation sleeve for 7 mm, as shown in Figure 4-8:

Cable type Conductor transverse area（mm²）

General photovoltaic cable

Scope(mm²) Recommended value（mm²）

2.5-4.0 4.0

A high voltage in the conductive part of the inverter may cause an

electric shock. When performing any installation on the inverter,

make sure that the AC and DC sides of the inverter are completely de-

energized.

Do not ground the positive or negative pole of the PV string, otherwise

it will cause serious damage to the inverter.

Static may cause damage to the electronic components of the

inverter. Anti-static measures should be taken during the repairing or

installation.

Do not use other brands or other types of PV terminals other than the

PV terminal in the accessory package. Sunways has the right to refuse

all damages caused by the mixed-use of terminals.

Moisture and dust can damage the inverter, ensure the cable gland

is securely tightened during installation. The warranty claim will be

invalided if the inverter damaged by the cable connector not well

installed.

Figure 4-8

Wire transverse area 2.5-4mm27mm

Danger

Warning

Attention

Warning

An AC breaker must be connected on the AC side of the inverter.

Any loads cannot be directly connected to the inverter.

Warning

Figure 4-9

Crimping Plier

Figure 4-10

Figure 4-11

3) Disassemble the connector in the accessory bag, as shown in Figure 4-9:

4) Insert the DC cable through the DC connector nut into the metal terminal and press the

terminal with a professional crimping plier (pull back the cable with some power to check if

it’s tight enough), as shown in Figure 4-10:

5) Insert the positive and negative cables into the corresponding positive and negative

connectors, pull back the cable to ensure that the terminal is tightly attached in the connector.

6) Use an open-end wrench to screw the nut to the end to ensure that the terminal is well

sealed, as shown in Figure 4-11:

1.Before assembling the DC connector, make sure that the cable

polarity is correct.

2.Use a multimeter to measure the voltage of the DC input string, verify

the polarity of the DC input cable, and ensure that each string voltage

is within 1000V.

Warning

Open-end Wrench

Figure 4-12

Figure 4-13

Model STT-6KTL STT-8KTL STT-10KTL STT-12KTL STT-15KTL STT-17KTL STT-20KTL STT-25KTL

Copper

Cable 2.5-10mm23.2-10mm24-10mm26-10mm26-10mm28-10mm28-10mm28-10mm2

Breaker 20A 20A 32A 32A 32A 40A 40A 50A

7) Insert the positive and negative connectors into the inverter DC input terminals respectively,

and a "click" sound represents the assembly in place, as shown in Figure 4 -12:

4.3.2 Connection of AC output

The Sunways STT 6-25kW series three phase inverter applies to the three-phase power grid

with a voltage of 230/400V and a frequency of 50/60Hz.

The recommended cable and AC breaker for the Sunways STT 6~25kW series three phase

inverter are shown in the following table:

4.3.2.1 AC connector connection steps

1) Take the AC connector out of the accessory bag and disassemble it, as shown in Figure 4-13:

Cable Gland Threaded Sleeve AC Terminal Head

Figure 4-15

Allen Key

Figure 4-16

2) According to the table above, select an appropriate copper cable, peel the insulation sleeve

of AC cable o󽗈 for 50mm, and peel o󽗈 the end of 3L /PE / N wires for 8mm, as shown in Figure

4-14:

3) Insert the stripped end of the 󽗉ve wires into the appropriate hole of the terminal head by

following the rules: yellow green wire to PE port, red or brown 󽗉re wires to L ports (no requsts

for the sequence of three 󽗉re wires), and blue or black wire to the N port. Please try to pull out

the cable to make sure it’s well connected. As shown in Figure 4- 15:

4) According to the arrow direction to push the threaded sleeve to make it connected with the

AC terminal head and then rotate the cable gland clockwise to lock it. As shown in 󽗉gure 4-16:

Figure 4-17 Connect the AC connector

Do not connect the N-wire as a protective ground wire to the inverter

casing. Otherwise, it may cause electric shock.

Good grounding is good for resisting surge voltage shock and

improving EMI performance. Inverters must be well-grounded.

For a system with only one inverter, just ground the PE cable.

For a multi-inverter system, all inverters PE wire need to be connected

to the same grounding copper bar to ensure equipotential bonding.

5) Connect the AC connector to the inverter AC terminal, and rotate the AC connector buckle

clockwise until its tight enough. As shown in 󽗉gure 4-17:

4.3.3 External ground connection

Ground terminal connection steps:

1) The external grounding terminal is located in the lower right side of the inverter.

2) Fix the grounding terminal to the PE wire with a proper tool and lock the grounding terminal

to the grounding hole in the lower right side of the inverter. As shown in Figure 4-18:

3) The transverse area of the external grounding cable is 4mm².

Danger

Attention

Figure 4-14

Strip Length:8mm

50mm

Wire Diameter:13-18mm

Connect the inverter and ground bar through PE wire to achieve the purpose of grouding

protectiion.

Figure 4-19

Figure 4-20

4.4 Monitoring Device Installation

Sunways STT 6~25kW series three phase inverter supports WiFi, GPRS and RS485

communication, you can choose according to your speci󽗉c needs.

Plug the WiFi or GPRS module into the COM port in the bottom of inverter by following the

direction the side with indicator is up (as shown in Figure 4-19). A slight “click” sound during

the installation represents that the assembly is in place.

22 23

4.5 System Layout of Units Without Integrated DC Switch

Local standards or codes may require that PV systems are 󽗉tted with an external DC switch on

the DC side. The DC switch must be able to safely disconnect the open-circuit voltage of the PV

array plus a safety reserve of 20%.Install a DC switch to each PV string to isolate the DC side of

the inverter. We recommend the following electrical connection:

1.The GPRS version module does not need to be con󽗉gured.

2.The WiFi version module needs to be configured to the router for

the first installation, and if the router name or password changed,

you need to con󽗉gure it again. For details, please refer to the [QUICK

INSTALLATION GUIDE] which attached in the accessory bag.

Don't touch the waterproof plug in the card slot unless replace the

SIM card. If the SIM card needs to be replaced, please make sure the

card slot iscompletely sealed by waterproof plug after replacing. Any

damages caused by the waterproof plug sealing problem will be invalid

of warranty.

Attention

Note

Figure 4-18

5. Start and Stop

5.1 Start Inverter

When starting the inverter, follow these steps:

1) Turn on the AC breaker 󽗉rst.

2) Turn on the DC switch in the bottom. If the PV string voltage higher than the inverter start-up

voltage, the inverter will start.

3) When both AC and DC power supply are normal, the inverter is ready to start. The inverter

will initiate from checking its internal parameters and grid parameters, if it’s within the range,

the green light on the left side of the screen begins to 󽗊ash, and the “Waiting” message will be

displayed on the OLED display.

4) After 30 seconds, the inverter will start generating electricity, the green light will remain on,

and the OLED display will display real-time power information.

5.2 Stop Inverter

When turning o󽗈 the inverter, please follow the steps below:

1) Turn o󽗈 the AC breaker 󽗉rst.

2) Wait 30 seconds and then turn the DC switch to the “OFF” position. At this time, there is

remaining power in the inverter capacitor. Wait for 5 minutes until the inverter is completely

de-energized before operating.

3) Disconnect the AC and DC cables.

6. General Operation

6.1 Display Operation

When the inverter is turned on, the following interfaces will be displayed on the OLED display,

and you can check the information and modify the parameters of the inverter by short or long

pressing the button. Please refer to the following display operation 󽗊ow for details:

Ma i n Wi nd ow

Wa itin g C he cki ng Norm al

Pac Error Code

P v V ol ta g e

P v Cu r re nt

E-DAY E-TOTAL H-TOTA L M o de l Na me General Set

Ret ur n

Ma i n Wi nd ow

SysInfo

FM Version

WIFI

Reset

WIFI

R el oad

Safety Set

Safe ty C o de

Power Limit P F S et

Hist or y

Error Code

RSSI

Time Set Language Set

SNError MessageS et ti ngS et ti ngS et ti ng

XXX%

S et ti ng S et ti ng S et ti ng S et ti ng

Short press(1s),switch window

Long press(3s),ente r the lower Menu Firmware

Updating

Tip:After every setting completed, wait for 10 s ec ond s a nd t he in ve rte r w ill au t oma ti cal l y s av e y ou r set ti ngs o r mo di fi cat io ns .

G ri d Vo lt a ge

G ri d Cur ren t

G ri d Fr equ en t

PowerLimit

OFF

PowerLimit

NOT WI FI

G ri d Con ne ct

Type Se t

Four /Three

Wire Syst em

Modbus

Addres s Set

1-247

Tip: After every setting completed, wait for 10 seconds and the inverter will

automaticaly save your settings or modi󽗉cations.

8. Technical Parameters

Model STT-

6KTL

STT-

8KTL

STT-

10KTL

STT-

12KTL

STT-

15KTL

STT-

17KTL

STT-

20KTL

STT-

25KTL

DC Input

Start-up Voltage(V)

200 200 200 200 200 200 200 200

Max. DC Input Voltage(V)

1,100 1,100 1,100 1,100 1,100 1,100 1,100 1,100

Rated DC Input Voltage(V)

620 620 620 620 620 620 620 620

MPPT Voltage Range(V)

200~950 200~950 200~950 200~950 200~950 200~950 200~950 200~950

Full power MPPT Voltage Range(V)

280~850 370~850 470~850 560~850 470~850 400~850 470~850 585~850

No. of MPP Trackers

22222222

No. of DC Inputs per MPPT

1/1 1/1 1/1 1/1 1/2 2/2 2/2 2/2

Max. Input Current(A)

11/11 11/11 11/11 11/11 11/22 22/22 22/22 22/22

Max. Short-circuit Current(A)

15/15 15/15 15/15 15/15 15/30 30/30 30/30 30/30

Backfeed current to the array(A)

00000000

AC Output

Rated Output Power(KW)

6 8 10 12 15 17 20 25

Max. Output Power(KW)

6.6 8.8 11 13.2 16.5 18.7 22 25

AC output rated apparent power(KVA)

6 8 10 12 15 17 20 25

Max. Apparent Power(KVA)

6.6 8.8 11 13.2 16.5 18.7 22 25

Rated Output Voltage(V)

3/N/PE, 230/400V

Rated AC Frequency(Hz)

50/60 50/60 50/60 50/60 50/60 50/60 50/60 50/60

AC output rated current(A) 8.7 11.6 14.5 17.4 21.7 24.6 29 36.2

Max. Output Current(A)

10 13.3 16.5 20 25 28.4 31.9 39

The measured Inrush current(A) [email protected] 7A@4ms 8.5A@4ms

Max. output fault current(A) 33 33 40 40 66 66 76 76

Max. output overcurrent protection(A) 33 33 40 40 66 66 76 76

Power Factor

0.8 leading …0.8 lagging

Max. total harmonic distortion

<3% @Rated Output Power

DCI <0.5%In

E󽗈eiciency

Max. E󽗋ciency

98.3% 98.3% 98.6% 98.6% 98.6% 98.6% 98.6% 98.6%

European E󽗋ciency

98.0% 98.0% 98.2% 98.2% 98.2% 98.2% 98.2% 98.2%

MPPT E󽗋ciency

99.9% 99.9% 99.9% 99.9% 99.9% 99.9% 99.9% 99.9%

7.Troubleshooting

7.1 Fault Messages

Sunways STT 6~25kW series three-phase inverter is designed in accordance with grid

operation standard, and conform to the requirements of the safety and EMC. The inverter had

passed a series of rigorous tests to ensure it runs sustainably and reliably before shipment.

When a fault occurs, the corresponding fault messages will display on the OLED display, and in

this case, the inverter might stop feeding into grid.

The fault messages and their corresponding troubleshooting methods are listed below:

Error Message Solution

Mains Lost 1. Check whether the mains supply is lost.

2. Check whether the AC breaker and terminal are well connected.

Grid Voltage Fault

1. Check whether the impendence of the AC cable is too high to lead the grid

voltage increased. Change a thicker AC cable if it is.

2. Extend the voltage protection range if it is allowed by the electricity

company.

Grid Frequency Fault

1. Check whether the AC cable is correct and well connected.

2. Change to another country with wider protection range if it's allowed by

the local electricity company.

DCI Fault 1. Restart the inverter.