Sungrow SG125HV User manual

SG125HV-V1-UEN-Ver10-201809 Version: 1.0
User Manual
SG125HV
SG125HV-20
PV Grid-connected
Inverter

I
About This Manual
This manual is for the SG125HV/SG125HV-20, a three-phase PV grid-connected
transformerless inverter, (hereinafter referred to as inverter unless otherwise
specified). The inverter is grid-connected, transformer-less, robust and of high
conversion efficiency.
Aim
This manual contains information about the inverter, which will provide
guidelines on connecting the inverter into the PV power system and how to
operate the inverter.
Related Documents
The manual cannot include all information about the PV system. You may get
additional information at www.sungrowpower.com.
Target Group
This manual is for technical personnel who are responsible for inverter
installation, operation and maintenance, and the inverter owner who will
perform daily APP operation.
How to Use This Manual
Read the manual and other related documents before commencing any work
on the inverter. Documents must be stored carefully and available at all times.
All rights reserved including the pictures, markings and symbols used. Any
reproduction or disclosure, even partially, of the contents of this manual is
strictly prohibited without prior written authorization of Sungrow.
The contents of the manual will be periodically updated or revised due to
product development. There may be changes in the manual due to subsequent
inverter editions. The latest manual can be acquired via visiting the website at
www.sungrowpower.com.

II
Symbols Explanation
Important instructions contained in this manual should be followed during
installation, operation and maintenance of the inverter. They will be highlighted
by the following symbols.
DANGER indicates a hazard with a high level of risk which, if not
avoided, will result in death or serious injury.
WARNING indicates a hazard with a medium level of risk which, if not
avoided, could result in death or serious injury.
CAUTION indicates a hazard
with a low level of risk which, if not
avoided, could result in minor or moderate injury.
NOTICE indicates a situation
which, if not avoided, could result in
equipment or property damage.
NOTE indicates additional information, emphasized contents or tips
to help you solve problems or save time.

III
Symbols on the Inverter Body
WARNING:
ELECTRIC SHOCK HAZARD. THE DC
CONDUCTORS OF THIS PHOTOVOLTAIC SYSTEM ARE
UNGROUNDED AND MAY BE ENERGIZED.
WARNING: Electric Shock Hazard. The DC
conductors of this photovoltaic system are normally
ungrounded but will become intermittently grounded
without indication when the inverter measures the PV
array isolation.
CAUTION:
Risk of Electric Shock, Do Not
Remove Cover. No User Serviceable Parts Inside. Refer
Servicing To Qualified Service Personnel.
CAUTION:
Risk Of Electric Shock
a) Both ac and dc voltage sources are terminated inside
this equipment. Each circuit must be individually
disconnected before servicing, and
b) When the photovoltaic array is exposed to light, it
supplies a dc voltage to this equipment.
CAUTION:
Risk of electric shock
from energy stored in capacitor. Do
not remove cover until 5 minutes after
disconnecting all sources of supply.
5 min
CAUTION: Hot surfaces – To reduce
the risk of burns. Do not touch.
CAUTION: Check user manual before
service!

IV
WARNING: ELECTRIC SHOCK
HAZARD. THE DC CONDUCTORS OF
THIS PHOTOVOLTAIC SYSTEM ARE
UNGROUNDED AND MAY BE
ENERGIZED.
AVERTISSEMENT: RISQUE DE CHOC
ÉLECTRIQUE. LES CONDUCTEURS DC
DE CE SYSTÈME PHOTOVOLTAÏQUE NE
SONT
PAS MIS À LA TERRE ET
PEUVENT ÊTRE MIS SOUS TENSION.
WARNING: Electric Shock Hazard. The
DC conductors of this photovoltaic
system are normally ungrounded but
will become intermittently grounded
without indication when the inverter
measures the PV array isolation.
AVERTISSEMENT: Risque de choc
électrique. Normalement, les
conducteurs CC de ce système
photovoltaïque ne sont pas mis à la
terre, mais seront mis à la terre sans
indication lorsque l'onduleur mesure
l'isolation du réseau photovoltaïque.
CAUTION: Risk of Electric Shock,Do
Not Remove Cover. No User
Serviceable
Parts Inside. Refer
Servicing To Qualified Service
Personnel.
ATTENTION: risque de choc électrique,
ne pas retirer la couverture. Pas de
pièces pouvant être réparées par
l'utilisateur à l'intérieur. Consulter le
personnel qualifié de service.
CAUTION: Risk Of Electric Shock
a) Both AC and DC voltage sources are
terminated inside this equipment.
Each circuit must be individually
disconnected before servicing.
b)
When the photovoltaic array is
exposed to light,
it supplies a DC
voltage to this equipment.
ATTENTION: Risque de choc électrique
A) Les sources de tension AC et DC sont
terminées à
l'intérieur de cet
équipement. Chaque circuit doit être
déconnecté individuellement avant
l'entretien, et
B) Lorsque le réseau photovoltaïque est
exposé à la lumière, il fournit une
tension DC à cet équipement.
CAUTION: Risk of electric shock from
energy stored in capacitor.
Do not
remove cover until 5 minutes after
disconnecting all sources of supply.
ATTENTION: risque de choc électrique
par l'énergie stockée dans le
condensateur. Ne pas retirer le
couvercle jusqu'à 5 minutes après avoir
débranché toutes les sources
d'alimentation.
CAUTION
：
Hot surfaces – To reduce
the risk of burns. Do not touch.
ATTENTION: surface chaude - Pour
réduire le risque de brûlure. Ne pas le
toucher.

V
CAUTION: Check user manual before
service.
ATTENTION: Vérifier le manuel
d'utilisateur avant l’utilisation.

VI
Contents
About This Manual .................................................................... I
1Safety Instructions.............................................................. 1
2Product Description.......................................................... 13
2.1 Intended Usage ..............................................................................................13
2.2 Product Introduction....................................................................................14
2.2.1 Model Description........................................................................................... 14
2.2.2 Appearance ........................................................................................................ 15
2.2.3 Dimensions......................................................................................................... 16
2.2.4 LED Indicator Panel......................................................................................... 16
2.2.5 DC Switch ............................................................................................................ 17
2.2.6 AC Switch............................................................................................................. 18
2.3 Technical Description ...................................................................................18
2.3.1 Circuit Diagram................................................................................................. 18
2.3.2 Function Description...................................................................................... 19
2.3.3 Derating ............................................................................................................... 20
2.3.4 PID Function....................................................................................................... 23
3Installation Flow ............................................................... 24
4Unpacking and Storage.................................................... 26
4.1 Unpacking and Inspection.........................................................................26
4.2 Identifying Inverter .......................................................................................27
4.3 Scope of Delivery...........................................................................................28
4.4 Inverter Storage..............................................................................................29
5Mechanical Installation .................................................... 31
5.1 Installation Site Selection ...........................................................................31
5.2 Moving Inverter to Installation Site .......................................................34

VII
5.3 Installation Tools ............................................................................................35
5.4 Installing the Inverter...................................................................................35
5.4.1 Installing to Metal Frame ............................................................................. 36
5.4.2 Installing to Concrete Wall........................................................................... 38
6Electrical Connection........................................................ 41
6.1 Terminal Description.....................................................................................41
6.1.1 Appearance ........................................................................................................ 41
6.1.2 Dimensions of Terminal................................................................................. 43
6.2 AC Side Cable Connection.........................................................................45
6.2.1 AC side requirements..................................................................................... 45
6.2.2 Grid Connection............................................................................................... 48
6.3 Connecting Inverter to PV Arrays ...........................................................52
6.3.1 PV Input Configuration ................................................................................. 52
6.3.2 PV Input Connection...................................................................................... 53
6.4Grounding the Inverter ...............................................................................57
6.4.1 Grounding System Overview...................................................................... 57
6.4.2 Second Protective Earth Terminal............................................................. 58
6.5 RS485 Communication Connection.......................................................59
6.5.1 Communication Overview ........................................................................... 59
6.5.2 RS485 Communication System.................................................................. 60
6.5.3 RS485 Communication Connection......................................................... 62
6.6 Configurable Dry Contact ..........................................................................64
7Commissioning ................................................................. 66
7.1 Inspection before Commissioning..........................................................66
7.2 Commissioning Procedure.........................................................................66
8Disconnecting, Dismantling and Disposing the Inverter68
8.1 Disconnecting the Inverter ........................................................................68
8.2 Dismantling the Inverter.............................................................................68
8.3 Disposal of the Inverter...............................................................................69

VIII
9Troubleshooting and Maintenance................................. 70
9.1 Troubleshooting .............................................................................................70
9.2 Maintenance ....................................................................................................79
9.2.1 Routine Maintenance..................................................................................... 79
9.2.2 Maintenance Instruction............................................................................... 79
10 SunAccess APP ................................................................ 82
10.1 Introduction to the System........................................................................82
10.2 Acquire and install SunAccess APP ........................................................82
10.2.1 Installation Condition .................................................................................. 82
10.2.2 Operation Steps............................................................................................. 82
10.3 Log into SunAccess APP .............................................................................83
10.4 Homepage........................................................................................................86
10.5 Run Info .............................................................................................................88
10.6 History Record ................................................................................................90
10.6.1 Fault Alarm Records ..................................................................................... 90
10.6.2 Power Yields Records................................................................................... 92
10.6.3 Event Records.................................................................................................. 93
10.7 More....................................................................................................................94
10.7.1 Power On/Power Off.................................................................................... 95
10.7.2 System Parameters ....................................................................................... 96
10.7.3 Operation Parameters................................................................................. 97
10.7.4 Protection Parameters................................................................................. 99
10.7.5 Communication Parameters...................................................................102
10.7.6 Download the Log ......................................................................................103
10.7.7 About SunAccess.........................................................................................104
11 Appendix ......................................................................... 105
11.1 Technical Data ...............................................................................................105
11.2 Tightening Torques .....................................................................................106
11.3 Exclusion of Liability ...................................................................................107

IX
11.4 Contact Information ...................................................................................109

1
1 Safety Instructions
The inverter has been designed and tested according to strict international
safety regulations. As electrical and electronic equipment, safety instructions
related to them must be complied with during installation, commissioning,
operation and maintenance. Incorrect operation or work may result in damage
to:
The property safety of the operator or a third party
The inverter and other properties that belong to the operator or a third party
Therefore, the following general safety instructions must be read and always
kept in mind prior to any work. All detailed work-related safety warnings and
notes will be specified at the critical points in corresponding chapters.
All installations should be performed by technical personnel. They
should have:
Received professional training;
R
ead through this manual and understood all related safety
instructions;
Been familiar with electric system related safety instructions.
Technical personnel mentioned above may perform the following work:
Install the inverter in a proper place;
Connect the inverter to the PV system;
Connect other devices to the PV system;
Commission the inverter;
Operate and maintain the inverter.
Before Installation
The unit is thoroughly tested and strictly inspected before delivery.
Damage may still occur during shipping.

1 Safety Instructions User Manual
2
If there is visible damage to the packaging or the inner contents, or if
there is something
missing, contact Sungrow or the forwarding
company.
There is a risk of injury due to improperly handling the device!

Always follow the instructions in the manual when moving and
positioning the inverter.
Injuries, serious wounds, or bruises may occur
if the device is
improperly handled.
During Mechanical Installation
Make sure inverter is not electrically connected before installing the
inverter.
System performance loss due to bad ventilation!
Proper-ventilation should be maintained during device operation. The
fan’s air inlet and outlet should not be covered to ensure the device
interior can sufficiently cool down.
During Electrical Connection
All electrical connections must be in accordance with national and local
standards.
The connection to the grid can be done only after receiving approval
from the local utility grid company.
Lethal voltage exists!

User Manual 1 Safety Instructions
3
PV arrays will generate electrical energy when exposed to sunlight and thus
can create potential electrical shock hazards.
All cables must be firmly attached, undamaged, properly insulated and
adequately dimensioned.
During Inverter Operation
Do not open inverter enclosure when inverter
is under load or
operating.
Only an intact and locked inverter cabinet can ensure personal and
property safety.
There is a risk of burn!
Do not touch hot components of the inverter
(for example, the
heatsink) during operation. Only the DC/AC
switch can be touched
during operation.
Operate the inverter by strictly following the descriptions in this manual to
avoid unnecessary personal injury and property damage. Arc flash, fire or
explosion may occur if done otherwise and Sungrow will hold no liability for
damages.
The following improper operations can cause an arc flash, fire and
explosion inside the device. Keep in mind that these accidents can only
be handled by qualified personnel. Improper handling of these
accidents may lead to a more serious fault or accident.
Plugging in and unplugging the DC side HV fuse when it is alive;
Touching the end of the cables that have no insulation and may still be
alive;

Touching the connection copper bus bar, terminal or other spare parts

1 Safety Instructions User Manual
4
inside the device that may be alive;
The power cable connection is loose;
Spare parts, such as bolts, are falling inside the inverter;
Incorrect operation by unqualified persons that have not received
training;
Before any operation of the device, a preliminary arc flash assessment
in the operation area is necessary. If there is a possibility of an arc flash,
The operators must receive related safety training;
Use best practices to assess the areas that may be affected by an arc
flash ;
Before any operation in the area that may be affected by an arc flash,
personal protective equipment (PPE) that meets the requirement must
be worn. A PPE category 2 is recommended.
Maintenance and Service
There is a risk of inverter damage or personal injury due to incorrect
service work!
Before any operation, you should perform the following steps:
First, disconnect the grid side switch and then disconnect the DC
switch;
Wait at least 10 minutes until the inner capacitors ar
e discharged
completely;
Verify, using proper testing device to make sure there is no voltage or
current.
Keep unqualified persons away!
A
temporary warning sign and barrier must be posted to keep
unqualified persons away during electrical connection and

User Manual 1 Safety Instructions
5
maintenance.

Restart the inverter only when the fault that may impair the inverter
safety functions is removed.
Inverter contains no owner serviceable parts inside. P
lease contact
local authorized personnel if any service work is required.
Do not replace the inverter internal components without permission.
Damage to the inverter may occur and it may void any or all warranty
rights from Sungrow.
There is a risk of inverter damage due to electrostatic discharge!
The printed circuit boards contain components sensitive to electrostatic
discharge.
Wear a grounding wrist band when handling the boards.
Avoid unnecessary touching of the boards.
Others
Certain parameter settings (country selection, etc.) by the SunAccess
APP must only be done by qualified persons.
Incorrect country setting may affect the inverter normal operation and
cause a breach of the type-certificate marking.
All safety instructions, warning labels, and nameplate on the inverter:
Must be clearly visible;
Should not be removed or covered.

1 Safety Instructions User Manual
6
Respect the following regulations:
Grid-connection regulations;
Safety instructions related to PV arrays;
Safety instructions related to other electrical devices.
Consignes de Sécurité
L'onduleur a été conçu et testé selon les règles de sécurité internationales
strictes. En tant qu'équipement électrique et électronique, les consignes de
sécurité qui s'y rapportent doivent être respectées lors de l'installation, de la
mise en service, de l'utilisation et de la maintenance. Un fonctionnement ou un
travail incorrect peut endommager:
La vie et le bien-être de l'opérateur ou d'un tiers
L'onduleur et d'autres propriétés qui appartiennent à l'opérateur ou à un
tiers
Par conséquent, les consignes de sécurité générales suivantes doivent être lues
et toujours gardées en tête avant tout travail. Tous les avertissements et notes
de sécurité détaillés liés au travail seront spécifiés aux points critiques des
chapitres correspondants.
AVERTISSEMENT
Toutes les installations doivent être effectuées par du personnel
technique. Ils devraient avoir:
Reçu une formation professionnelle;
Lu ce manuel et compris toutes les consignes de sécurité connexes;
Connu les consignes de sécurité liées au système électrique.
Le personnel technique mentionné ci-dessus peut effectuer les travaux suivants:
Installer l'onduleur dans un endroit approprié;
Connecter l'onduleur au système photovoltaïque;
Connecter d'autres appareils au système photovoltaïque;
Mettre l'onduleur en service;
Faire fonctionner et maintenir l'onduleur.

User Manual 1 Safety Instructions
7
Avant l’Installation
L'appareil est soigneusement testé et strictement inspecté avant la
livraison. Des dégâts peuvent survenir lors de l'expédition.
S'il y a des dommages visibles à l'emballage ou au contenu interne, ou
s'il y a quelque chose qui manque, contacter Sungrow ou la société
d'expédition.
ATTENTION

Risque de blessures suite à une mauvaise manipulation de l'appareil!
Respecter toujours les instructions du manuel lors du déplacement et
du positionnement de l'onduleur.

Des lésions, des blessures graves ou des ecchymoses peuvent se
produire si l'appareil est mal manipulé.
Pendant l'Installation Mécanique
S’assurer que l'onduleur n'est pas connecté électriquement avant son
installation.
ATTENTION
Perte de performance du système due à une mauvaise ventilation!
Une bonne ventilation doit être maintenue pendant le fonctionnement
de l'appareil. L'entrée et la sortie d'air du ventilateur ne doivent pas être
couvertes pour s'assurer que l'intérieur de l'appareil peut être
suffisamment refroidi.
Pendant la Connexion Électrique
Toutes les connexions électriques doivent être conformes aux normes
nationales et locales.
La connexion au réseau ne peut être effectuée qu'après avoir reçu

1 Safety Instructions User Manual
8
l'approbation de la société de réseau local.
Une tension létale existe!
Les groupes photovoltaïques produiront de l'énergie électrique lorsqu'ils
sont exposés à la lumière du soleil et créeront ainsi des risques
potentiels de choc électrique.
AVERTISSEMENT
Tous les câbles doivent être solidement fixés, intacts, correctement
isolés et dimensionnés de manière adéquate.
Pendant l'Opération de l'Onduleur
AVERTISSEMENT
Ne pas ouvrir l'enceinte de l’onduleur lorsqu’il est en charge ou
fonctionne.
Seul un onduleur intact et verrouillé peut assurer la sécurité de
personnel et de propriété.
ATTENTION
Il y a un risque de brûlure!
Ne pas toucher les composants chauds de l'onduleur (par exemple, le
radiateur) pendant le fonctionnement. Seul le commutateur DC / AC
peut être touché pendant le fonctionnement.
Utiliser l'onduleur en suivant strictement les descriptions de ce manuel afin
d'éviter des blessures évitables aux personnes et des dommages à l'appareil. Un
arc électrique, un incendie ou une explosion peuvent se produire si cela
s'effectue autrement et Sungrow ne sera responsable des dommages.
AVERTISSEMENT
Les opérations incorrectes suivantes peuvent provoquer un arc
électrique, un incendie et une explosion à l’intérieur de l'appareil.
Garder à l'esprit que ces accidents ne peuvent être traités que par du