Sungrow PVS-24MH User manual

PVS-24MH_20MH_16MH-UEN-Ver20-202007
User Manual
PVS-24MH/20MH/16MH
PV Array Combiner Box

Contents
1About This Manual..............................................................1
1.1 Validity....................................................................................... 1
1.2 Target Readers ......................................................................... 1
1.3 How to Use this Manual ............................................................ 1
1.4 Others ....................................................................................... 2
1.5 Symbol Explanation................................................................... 2
1.6 Figures Explanation................................................................... 3
2Safety Instructions..............................................................4
3Product Description ............................................................8
3.1 System Introduction................................................................... 8
3.2 Main Features ........................................................................... 9
3.3 Demonstration of the Type ........................................................ 9
3.4 Dimensions ............................................................................. 10
3.5 Identifying the PVS.................................................................. 10
4Mechanical Installation .....................................................12
4.1 Scope of Delivery .................................................................... 12
4.2 Storage.................................................................................... 13
4.3 Installation Site Requirements................................................. 14
4.4 Installation Tools...................................................................... 15
4.5Installing PVS.......................................................................... 16
5Electrical Installation.........................................................20

5.1 Internal Structure .....................................................................20
5.2 Waterproof Terminal ................................................................22
5.3 Wiring Preparations .................................................................24
5.4 Connections.............................................................................25
5.4.1 Input Connections ................................................................... 25
5.4.2 Output Connections ................................................................ 28
5.4.3 Grounding Connections........................................................... 30
5.4.4 Communication Connections .................................................. 33
5.5 Cable Layout............................................................................35
5.6 Communication Settings ..........................................................36
5.6.2 Setting Communication Address ............................................. 37
5.6.3 Setting String Input Number .................................................... 38
5.7 Start/Stop.................................................................................38
6Commissioning................................................................. 39
7Routine Maintenance ....................................................... 40
7.1 Overview..................................................................................40
7.2 Replace the Fuse.....................................................................40
7.3 Replace the Sealing Strip ........................................................41
8Troubleshooting ............................................................... 43
8.1 Before Troubleshooting............................................................43
8.2 Common Faults and Troubleshooting......................................43
9Appendix.......................................................................... 46
9.1 Technical Data.........................................................................46

9.2 Cable Requirement ................................................................. 47
9.3 Quality Assurance ................................................................... 47
9.4 Contact Information................................................................. 49

1
1 About This Manual
1.1 Validity
This manual is valid for the following PV array combiner boxes:
PVS-24MH
PVS-20MH
PVS-16MH
Unless otherwise specified, any of the above PV array combiner boxes is
hereinafter referred to as "PVS".
1.2 Target Readers
This manual is for users who operate the PVS or conduct the maintenance work.
The operators must be trained and qualified personnel.
1.3 How to Use this Manual
Read this manual and other related document before installing the PVS.
Documents must be stored in a convenient place for future reference.
The contents of the manual will be periodically updated or revised due to the
product development. It is probably that there are changes of manual in the
subsequent edition.

1 About This Manual User Manual
2
1.4 Others
This document will take the PVS-24MH for example. For the installation and
use of other types of combiner boxes, please also refer to this manual.
PVS-20MH
PVS-16MH
The electrical structure, installation and use method of PVS-20MH / PVS-16MH
are the same with that of PVS-24MH. The only difference between them is the
numbers of DC input strings.
For any questions, please call the Customer Service Center of Sungrow Power
Supply Co., Ltd.
1.5 Symbol Explanation
This manual contains important safety and operational instructions that must be
accurately understood and followed during the installation and maintenance of
the equipment.
To ensure optimum use of this manual, note the following explanations of
symbols used.
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, will result in death or serious injury.

User Manual 1 About This Manual
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CAUTION indicates a hazard with a low level of risk which, if not avoided,
will result in minor or moderate injury.
NOTICE indicates a situation which, if not avoided, will result in equipment
malfunction or property damage.
NOTE indicates additional information, emphasized contents or tips
to help you solve problems or save time.
The following symbols on the device enclosure must be paid attention to.
Symbols
Explanation
Risk of electric shock! If not avoided, lethal hazard can be caused.
Hot surface! Do not touch!
The symbol represents protective conductor terminal. The terminal
should be connected firmly to avoid potential injury or property
damage.
1.6 Figures Explanation
Figures provided in this manual are all based on the PVS with standard
configuration.
The actual PVS you received may differ from the example figures in the
numbers of the installation hangers, etc.

4
2 Safety Instructions
This chapter describes some important safety instructions about PVS.
Please read the manual carefully before installation. If any device damage
occurs when ignoring the safety instructions, our company has the right to
exclude all warranty claims.
Lethal Voltage!
Death resulting from burning and electric shock upon touching the live
components of the PVS.
Disconnect the end connection of the PV string before cable connection;
Do not use ordinary ammeter to measure the DC voltage before cable
connection. An ammeter with withstanding voltage of 1500V is
recommended. Serious consequences may follow if otherwise.
Observe all safety instructions required by the PV cell manufacturer.
Device damage or system fault may cause fire and electric shock!
Optical check the device for any possible damages or dangerous states
before operation.
Check if other external devices or circuit connection are in safe state.
Work on the device only when it is safe to do so.

User Manual 2 Safety Instructions
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Death or burning hazard by touching the internal terminals of the device!
Do not touch the terminals or conductors in contact to the inverter or PV
string.
Observe all the instructions and safety regulations related to PVS
connection.
High voltage is present inside the device!
Follow all the warning signs in the device.
Respect all the safety instructions in this manual and other document.
The ground cable must be grounded properly, otherwise,
lethal electric shock happens to the operator or installer once a fault
occurs.
device may be damaged after lightening stroke.
Incorrect cable connection may cause damages to the PV cells, the PVS and
inverter. Respect the following instructions during cable connection:
Connect by strictly following the circuit diagram;
Measure and make sure the string open-circuit voltage meets the
requirements of the PVS before inserting the fuse;
Identify the positive pole and negative pole before connection.

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Only qualified personnel or professional electrician can perform the
operation and wiring described in this manual.
All operations and wirings must in full accordance with the national and
local standards and requirements.
All warning marks and labels must be clear and intact. Replace them if any
damages are found.
Make sure the terminals are firmly connected during wiring. If the cable
copper core and the terminals are not connected firmly, terminals will be
over-heating and burnt. Anti-flaming cables with multi-strand are advisable
and the cable cross-sectional area should be no less than the recommended
value.
The nuts of the water-proof terminals must be firmly screwed to prevent
water leakage and PVS damages.
Pull the fuse out of the fuse holder for personal and device safety.
Lock the cabinet door and seal the water-proof cover of the lock core after
operation.
No not open the cabinet door frequently.

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Touching or improper operation on the PCB or other sensitive components
may damage the device.
Do not touch any parts inside the cabinet other than the connection
terminals.
Respect all ESD related safety regulations and wear antistatic wrist
strap.

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3 Product Description
3.1 System Introduction
For a large-scale grid-connected PV system, it is common to install a DC
combining device between PV modules and inverters to minimize cable
connections, facilitate maintenance and enhance reliability.
PVS is designed for meeting these requirements, which provides a Turnkey
solution for PV plant systems.
Considering different types of PVS, a certain number of PV strings can be
connected to the input side of PVS. After combining work done, at the output
side, there will be one DC+ and one DC- main line. By using of surge protection
device (SPD) and load-break switch, the output can be connected to inverters
directly.
The PV generation system including a PVS is shown in following figure.
Fig. 3-1 Composition of PV generation system

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Tab. 3-1 Device in above figure
No.
Device
A
PV arrays
B
PV Array combiner box
C
Inverter
D
Logger/Smart monitoring unit
E
Meteo Station
F
Grid
3.2 Main Features
Meet outdoor installation requirement
Connect to multiple PV inputs with fuse for each input (can be replaced to
other degree)
PV-specific high voltage SPD equipped, lightening protection function for
positive and negative pole
Current detection unit monitors the current of each string; and the monitored
information can be displayed by the LED or sent by RS485
Monitor busbar voltage and the monitored information can be displayed by
the LED and sent by RS485
3.3 Demonstration of the Type
Description of the combiner box type is as follows:

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PVS XX
B
A
M
C
-H
D
Meanings of the letters are as follows:
A: Code of the PV array combiner box
B: Max. number of PV strings
C: Equipped with monitoring function
D: High voltage, up to 1,500Vdc
Model
Max.Number of PV strings
Monitoring function
PVS-24MH
24
YES
PVS-20MH
20
YES
PVS-16MH
16
YES
3.4 Dimensions
The dimensions of the PVS are shown in the figure below (take PVS-24MH for
example).
950
730
275
3.5 Identifying the PVS
The appearance of the PVS is shown in the figure below (take PVS-24MH for

User Manual 3 Product Description
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example).
A
No.
Name
Description
A
Lockhole
-

12
4 Mechanical Installation
4.1 Scope of Delivery
A B C
ED F
No
Name
Note
Quantity
A
PVS
-
1
B
Related documents
Including FQC test report,
Quality Certificate, Warranty
card, Manual, etc.
1
C
Keys
To open the cabinet of PVS.
1
D
Bolt kit
M8 x 16
4
E
Hanger
Need to be installed to the PVS
cabinet onsite.
4
F*
MC4 connector
Used to connect the PV input
16 pairs a) /
20 pairs b) /
24 pairs c)
Note 1: * is optional accessory.

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Note 2: a) is intended for PVS-16MH; b) is intended for PVS-20MH; and c) is
intended for PVS-24MH.
4.2 Storage
If combiner boxes are not put into operation immediately, they need to be
stored under specific environmental conditions:
Store combiner boxes with outer packages in a ventilated, dry and tidy
indoor environment with desiccant retained.
The storage carriers should be solid enough to carry the weight of the outer
packages of the bus boxes.
The number of stacking layers of multiple combiner boxes should not exceed
the "stacking layer limit" marked on the outer boxes.
The packing boxes should not be tilted or inverted.
Pay attention to ventilation and moisture prevention when storing equipment.
Accumulated water is strictly prohibited in the storage environment.
The storage environment should be at the temperature of -40 ℃~ +70 ℃
and the relative humidity of 0 ~ 95%, and free of condensation.
Pay attention to the surrounding harsh environment, such as sudden cold,
sudden heating, collision, etc., so as to avoid damage to the combiner
boxes.
If the combiner boxes have been stored for half a year or a longer time,
comprehensive inspection and testing by professionals are required before
they can be put into operation.
Carry out regular inspection at the frequency of not lower than once a week.
Check whether the packaging is intact and avoid insect bites. If the outer
packaging is damaged, replace it immediately.

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Caution
It is strictly prohibited to store combiner boxes without packaging!
It is strictly prohibited to store combiner boxes outdoors or in direct sunlight!
It is strictly prohibited to tilt or overlap the equipment!
Caution
After long-term storage and before installation of combiner box, carry out a
thorough inspection to determine whether they are in good condition. If
necessary, they are must be tested by professionals before installation.
4.3 Installation Site Requirements
The PVS can be installed outdoors. Please meet the following requirements:
Take the dimensions and weight of the PVS into account when selecting the
installation location. The PVS should be installed as close to the PV modules
as possible for easier current confluence and lower cable costs.
The ambient temperature ranges from -40℃to +60℃, and the relative
humidity from 0 to 95%. The PVS should be installed in a dry, well-ventilated,
and dust-proof place.
Never install the PVS in a place directly exposed to sunlight. Otherwise,
excessively high temperature will cause lower power yields or even shorten
the service life of the device.
In a large-scale power plant, the PVS should be vertically installed at the
shading area of the bracket of PV modules. Maintain enough clearances
around the PVS for better heat dissipation and ease of routine maintenance.