SMA SSM16-11 User Manual
EN
Accessories for Central Inverter
SUNNY STRING-MONITOR SSM16-11/SSM24-11
Installation Guide
SSM16-24-IA-IEN105120 | 98-4024820 | Version 2.0
SMA Solar Technology AG Table of Contents
Table of Contents
1 Information on this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1 Appropriate Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 Target Group Qualification . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4 Symbols on the Type Label and the Sunny String-Monitor . . . . 13
3 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1 SunnyString‑MonitorSSM16-11 / SSM24-11 . . . . . . . . . . . . 14
3.2 String Current Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 String Fuses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.4 Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.5 Remote Tripping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.5.1 Remote Tripping as a Shunt Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.5.2 Remote Tripping as Undervoltage Release . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.6 Type Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4 Scope of Delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1 Sunny String-Monitor SSM16-11 . . . . . . . . . . . . . . . . . . . . . . . 20
4.2 Sunny String-Monitor SSM24-11 . . . . . . . . . . . . . . . . . . . . . . . 21
5 Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.1 Base Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.1.1 Selecting the Mounting Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.1.2 Mounting the Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.1.3 Mounting the Sunny String-Monitor on the Base. . . . . . . . . . . . . . . . . . . . . . 25
5.2 Wall Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.2.1 Selecting the Mounting Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.2.2 Mounting the Sunny String-Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
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Table of Contents SMA Solar Technology AG
6 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.1 Overview of the Connection Area . . . . . . . . . . . . . . . . . . . . . . 29
6.2 Connecting the PV Strings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.2.1 Calculating the Maximum Number of Strings per Measuring Input . . . . . . . 31
6.2.2 Connecting the PV Strings to Isolation Terminals. . . . . . . . . . . . . . . . . . . . . . 31
6.2.3 Connecting the PV Strings to the SUNCLIX DC Plug Connectors . . . . . . . . . 31
6.2.4 Connecting the PV Strings to Tyco, MC3, and MC4 Plug Connectors . . . . . 34
6.3 Connecting the DC Main Cable. . . . . . . . . . . . . . . . . . . . . . . . 34
6.4 Connecting the Grounding Cable. . . . . . . . . . . . . . . . . . . . . . . 35
6.5 Connecting the Data Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.5.1 Selecting the Data Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.5.2 Connecting the Data Cable Shield Contact . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.5.3 Connecting the Data Cable in the Sunny String-Monitor . . . . . . . . . . . . . . . 37
6.5.4 Connecting the Data Cable in the Sunny Central. . . . . . . . . . . . . . . . . . . . . 38
6.6 Connecting the Remote Tripping for the DC Circuit Breaker. . . 40
6.6.1 Dimensioning the Connection Cable for the Shunt Trip. . . . . . . . . . . . . . . . . 40
6.6.2 Connecting the Shunt Release. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.6.3 Connecting the Feedback Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.7 Installing the Theft Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.2 Preparing and Carrying Out Commissioning . . . . . . . . . . . . . . 43
7.2.1 Requirements for Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.2.2 Terminating the Data Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.2.3 Noting the Serial Number of the Piggy-Backs for Data Processing. . . . . . . . 45
7.2.4 Filling In the Commissioning Report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.3 Switching On the Sunny String-Monitor . . . . . . . . . . . . . . . . . . 46
7.4 Reconnecting the DC Circuit Breaker after Tripping . . . . . . . . . 46
8 Disconnecting the Sunny String-Monitor . . . . . . . . . . . . . 47
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SMA Solar Technology AG Table of Contents
9 Configuring the Sunny String-Monitor via
Sunny Central Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
9.1 Organizing the Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 48
9.2 Detecting Sunny String-Monitors. . . . . . . . . . . . . . . . . . . . . . . . 48
9.3 Setting the Parameters for the String Current Monitoring . . . . . 50
9.3.1 Setting the Number of Strings per Measuring Channel . . . . . . . . . . . . . . . . 50
9.3.2 Setting the Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.3.3 Setting the Tripping Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.3.4 Setting the Tolerance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.3.5 Setting the Monitoring Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.3.6 Setting the Nighttime Deactivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9.3.7 Setting the Theft Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
9.4 Reading the Measured Values . . . . . . . . . . . . . . . . . . . . . . . . . 52
9.4.1 Reading the Mean Values of the Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
9.4.2 Reading the Mean Values for the Individual Measuring Channels. . . . . . . . 52
9.5 Reading and Confirming Messages . . . . . . . . . . . . . . . . . . . . . 52
9.5.1 Resetting the Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
9.5.2 Reading and Confirming Current Messages. . . . . . . . . . . . . . . . . . . . . . . . . 52
9.5.3 Reading and Confirming the Event History . . . . . . . . . . . . . . . . . . . . . . . . . . 52
10 Configuring the Sunny String-Monitor with
Sunny Data Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
10.1 Organizing the Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 53
10.2 Detecting the Sunny String-Monitor . . . . . . . . . . . . . . . . . . . . . 55
10.3 Setting Parameters for String Current Monitoring . . . . . . . . . . . 56
10.3.1 Overview of the Program Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
10.3.2 Setting the Number of Strings per Measuring Channel . . . . . . . . . . . . . . . . 57
10.3.3 Setting the Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
10.3.4 Setting the Monitoring Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
10.3.5 Setting the Tripping Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
10.3.6 Setting the Tolerance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
10.3.7 Setting the Nighttime Deactivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
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Table of Contents SMA Solar Technology AG
10.3.8 Setting the Theft Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10.4 Reading the Measured Values . . . . . . . . . . . . . . . . . . . . . . . . . 59
11 Configuring the Sunny String-Monitor with
Sunny WebBox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
11.1 Organizing the Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 60
11.2 Sunny WebBox Interface Overview . . . . . . . . . . . . . . . . . . . . . 60
11.3 Detecting the Sunny Central . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
11.4 Detecting the Sunny String-Monitor . . . . . . . . . . . . . . . . . . . . . 61
11.5 Setting the Parameters for Sunny Central Control. . . . . . . . . . . 62
11.5.1 Setting the Number of Strings per Measuring Channel . . . . . . . . . . . . . . . . 62
11.5.2 Setting the Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
11.5.3 Setting the Monitoring Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
11.5.4 Setting the Tripping Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
11.5.5 Setting the Tolerance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
11.6 Setting the Parameters for the Sunny Central String Monitor
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
11.6.1 Setting the Number of Strings per Measuring Channel . . . . . . . . . . . . . . . . 64
11.6.2 Setting the Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
11.6.3 Setting the Communication Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
11.6.4 Setting the Monitoring Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
11.6.5 Setting the Tripping Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
11.6.6 Setting the Tolerance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
11.7 Reading the Measured Values . . . . . . . . . . . . . . . . . . . . . . . . . 66
11.7.1 Reading the Measured Values of the Groups. . . . . . . . . . . . . . . . . . . . . . . . 66
11.7.2 Reading the Measured Values for the Individual
Measuring Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
11.8 Acknowledging Error Messages. . . . . . . . . . . . . . . . . . . . . . . . 67
11.8.1 Acknowledging Error Messages with Sunny Central Control . . . . . . . . . . . . 67
11.8.2 Acknowledging Error Messages with the Sunny Central String Monitor
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
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SMA Solar Technology AG Table of Contents
12 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
12.1 LED signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
12.2 Communication and Operation Faults . . . . . . . . . . . . . . . . . . . 69
13 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
13.1 Sunny String‑Monitor SSM16-11 . . . . . . . . . . . . . . . . . . . . . . . 70
13.2 Sunny String‑Monitor SSM24-11 . . . . . . . . . . . . . . . . . . . . . . . 76
14 Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Installation Guide SSM16-24-IA-IEN105120 7
1 Information on this Guide SMA Solar Technology AG
1 Information on this Guide
Validity
This installation guide applies to the following devices:
•SunnyString‑MonitorSSM16‑11
•Sunny String-Monitor SSM24-11
Target Group
This manual is intended for skilled workers. Only qualified personnel are allowed to perform the tasks
set forth in this manual (see section 2.2”Target Group Qualification”,page10).
Additional Information
Additional information is available at www.SMA.de/en:
Document title Document type
Product Details ‒ Features and Mounting Options for
SUNNY STRING-MONITOR SSM 16-11
Product Details ‒Features and Mounting Options for
SUNNY STRING-MONITOR SSM 24-11
Plant communication in large-scale PV plants ‒
POSSIBILITIES OF PLANT COMMUNICATION
Technical Information
Technical Information
Technical Description
Utility Model
The Sunny String-Monitor SSM 16-11 and the Sunny String-Monitor SSM24-11 have pending utility
patents.
8 SSM16-24-IA-IEN105120 Installation Guide
SMA Solar Technology AG 1 Information on this Guide
%"/(&3
8"3/*/(
$"65*0/
/05*$&
Symbols
Symbol Explanation
Indicates a hazardous situation which, if not avoided, will result in death
or serious injury.
Indicates a hazardous situation which, if not avoided, could result in death
or serious injury.
Indicates a hazardous situation which, if not avoided, could result in minor
or moderate injury.
Indicates a situation that can result in property damage if not avoided.
Indicates information that is important for a specific topic or objective, but
is not safety-relevant.
☐ Indicates a requirement for meeting a specific goal.
☑ Desired result.
✖ Undesired result. Followed by a solution on how to achieve the desired
result.
Typography
Typography Usage Example
"light" • Information displayed on
the inverter
•Elements on a software
interface
•Connections
bold • Elements from which you
should make a selection
•Elements which you
should input
> •Several elements which
you should select
[Button/key] • The button or key which
you should select or press
• The value can be read in the field
"Energy".
• Select Settings.
•Enter 10 in the "Minutes" field.
• Select Settings > Date.
• Select [Next].
Nomenclature
The manual deals with both the SunnyString‑Monitor SSM16-11 and the
SunnyString‑MonitorSSM24-11 and they are referred to as the Sunny String-Monitor.
Installation Guide SSM16-24-IA-IEN105120 9
2 Safety SMA Solar Technology AG
2Safety
2.1 Appropriate Usage
The SunnyString‑Monitor is a DC sub-distributor to which several strings ca n be connected in paral lel.
The Sunny String-Monitor monitors the input current to the strings, detects failures and thus helps to
minimize power and yield losses.
Figure1:Principle of a grid-tie PV plant
Position Designation
APV array
B Sunny String-Monitor
C Sunny Central
D Transformer
E Power distribution grid
2.2 Target Group Qualification
All work on the plants may only be carried out by qualified technical personnel. Qualified means that
the personnel must possess training relevant to the task performed and must be familiar with the
content of this manual.
2.3 Safety Instructions
Following Instructions
Failure to follow this manual and the operating or safety instructions it contains may lead to severe
injury from electric shock.
• Only perform work as described in this manual. Observe all safety instructions.
• Keep the documentation for the Sunny String-Monitor and for the installed components with the
system documentation. They must be accessible at all times.
10 SSM16-24-IA-IEN105120 Installation Guide
SMA Solar Technology AG 2 Safety
Electric Shock
The Sunny String-Monitor is connected to high voltages. Work on the Sunny String-Monitor is only
allowed if the power is disconnected and in compliance with the guidelines that apply at the
installation location.
• Disconnecting the device:
– Remove the DC fuses in the central inverter or main DC distributor, such as the Sunny Main
Box, in a no-load condition.
– Switch off the DC circuit breaker in the Sunny String-Monitor.
– Only open or close the isolation terminals in the Sunny String-Monitor in a no-load condition.
– Only insert or remove the fuses when wearing personal protective gear.
– Only plug in or unplug the Solar Plug when no load is present.
• Ensure that the device cannot be reconnected.
• Ensure that no voltage is present in the system.
• Ground and short-circuit.
• Cover or safeguard any adjacent live components. Protective covers must always be fitted.
If there is a grounding fault, grounded plant sections may be presumed live.
• Ensure there is no voltage present before touching.
Operating a damaged Sunny String-Monitor may cause severe injury from electric shock.
• The Sunny String-Monitor may only be used when it is technically faultless and safe to operate.
• Operate the Sunny String-Monitor only without visible damage and check regularly for visible
damage.
• E nsu re t hat all ext ernal safet y equipme nt i s fr eel y ac ces sib le a t all time s an d is reg ula rly che cke d
for proper functioning.
Burns
Some components, such as fuses, can become hot during operation.
• Wear safety gloves when working on the device.
Installation Guide SSM16-24-IA-IEN105120 11
2 Safety SMA Solar Technology AG
Damage to the Sunny String-Monitor
If the Sunny String-Monitor or the PV plant are handled by persons unauthorized to do so, they might
sustain damage.
• Lock the Sunny String-Monitor after it has been put into operation.
• Remove the keys from the door locks.
• Keep the keys in a safe place.
Environmental Influences
When closed, the Sunny String-Monitor carries IP54 and is thus protected from dust and water.
• Do not carry out any assembly work in rain, fog or if humidity exceeds 95%.
• Close the doors of the Sunny String-Monitor after work on it is complete.
Electrostatic Discharge
Electrostatic discharge can destroy electronic component parts.
• When you work on the Sunny String-Monitor or its assemblies, observe the ESD safety
regulations and wear protective gloves.
• Conduct any electrostatic charges away from the electronic component parts before touching
them. To do this, touch the unpainted grounded parts of the housing, the PE connection, for
example.
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SMA Solar Technology AG 2 Safety
2.4 Symbols on the Type Label and the Sunny String-Monitor
Symbol Explanation
Warning of dangerous electrical voltage.
The Sunny String-Monitor is connected to high voltages. All work on the
SunnyString-Monitor must only be carried out by electrically skilled persons.
Warning of hot surface.
The Sunny String-Monitor can become hot during operation. Avoid contact during
operation.
Take note of all the documentation supplied with the Sunny String-Monitor.
CE mark.
The Sunny String-Monitor complies with the requirements of the applicable EC
guidelines.
The Sunny String-Monitor must not be disposed of via domestic waste
arrangements.
Installation Guide SSM16-24-IA-IEN105120 13
3 Product Description SMA Solar Technology AG
3 Product Description
3.1 SunnyString‑MonitorSSM16-11 / SSM24-11
The Sunny String‑Monitor is a DC sub-distributor to which several strings can be connected in parallel.
The Sunny String-Monitor monitors the input current to the strings and detects malfunctions.
Figure2:Structure of the Sunny String-Monitor
Position Designation
A Doors
B Switch cabinet lock
The string currents are monitored by the measuring board in the String Monitor Unit in the
SunnyString-Monitor. A Piggy-Back is integrated in the measuring board for data processing. The
data processing Piggy-Back manages the string currents and the parameterization of the measuring
board.
The string fuses in the Sunny String-Monitor protect the PV string modules from reverse currents.
3.2 String Current Monitoring
The string currents are monitored via the measuring board in the String Monitor Unit (SMU). The
String Monitor Unit measures the string currents and continuously calcu lat es t he a ver age cur ren ts. The
SMU compares the string currents with the mean values. If a string current exceeds or falls short of the
mean value by the set tolerance value, the warning 380 "SMU" is displayed.
You can adjust the parameters for monitoring the string current on the Sunny Central 100/200/250/
350 inverters and the Sunny Central in the HE-11 series on the int egrate d Sunny Centra l Contr ol data
logger or in the Sunny Data Control program on the PC. It is also possible to read mean values on
the Sunny Central Control and in the Sunny Data Control.
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SMA Solar Technology AG 3 Product Description
With the Sunny Central inverters in the CP and the HE-20 series, you can set the parameters on the
PC via the WebBox interface and read the mean values and the messages.
With the parameterization, the Sunny String-Monitor can determine the total malfunction of a string
within a polling interval. Slightly elevated string currents are reliably detected in several polling
intervals and distinguished from typical current fluctuations of the PV array.
The following describes:
• The circumstances under which the string current is monitored
• The intervals at which data is transmitted
• Which parameters are important for the sensitivity with which the string current is monitored.
Requirements for Activating the String Current Monitoring
☐ The DC power of the PV array exceeds 5% of the nominal AC power of the Sunny Central.
P
> 0.05 * P
DC
Value Designation
P
DC
P
AC nom
PV array power
Sunny Central nominal AC power
☐ The string current mean value of the individual groups is equal or greater than 0.5 A.
I
M String
AC nom
≥ 0.5A
Value Designation
I
M String
Mean value of string-current from each group
Error Sum
The error sum is a measure of the sensitivity of the string current monitoring. It can be parameterized
via the tripping time and tolerance, and is described by the following formula:
The individual error sums of the measuring channels are reset at 00:00 o'clock.
Installation Guide SSM16-24-IA-IEN105120 15
3 Product Description SMA Solar Technology AG
Polling Interval
The Sunny String-Monitor continually measures the string currents and saves them in cycles. The data
logger reads these values every 5 minutes.
Tripping Time
The tripping time is the time span between the occurrence of a fault and the error message. The
tripping time is set to 180 minutes as default. You can set the parameters for the tripping time between
2 … 1440 minutes.
Tolerance
The tolerance indicates how much the string current may deviate fr om t he m ean value . Wh en t he s tring
current is outside of the tolerance limits, the data logger detects the deviation and stores it. The
tolerance can be set between 10% … 100%.
Grouping Strings
You can assign the strings to the 8 measuring channels in order to simplify monitoring. Should
individual PV strings be overshadowed, aligned differently or fitted with different modules, it is also
possible to group the individual measuring channels. This makes it possible to compare measuring
channels with the same properties.
Comparison
Every 5 minutes, the data logger compares the string-current with the mean value for the group. If the
string-current exceeds the tolerance limit, the data logger stores the deviation. If at the next poll, there
is still a deviation between the string-current and the mean value, the deviations are added together.
If the sum of deviations exceeds the error sum, the data logger sends the 380 "SMU" warning. When
the error is acknowledged, the error sum is reset, and the warning disappears from the display.
It is possible to see from the Sunny Central Control or via the Sunny WebBox which Sunny StringMonitor and which measuring channels are deviating from the mean value for the group.
Example:
It is assumed that at time t0 the mean value of a group is 5 A. The set tolerance is 10%. This means
that the tolerance range is from 4.5 A … 5.5 A. The tripping time is set to 10 minutes. The polling
interval is 5 minutes. The error sum can therefore be calculated as follows:
16 SSM16-24-IA-IEN105120 Installation Guide
SMA Solar Technology AG 3 Product Description
All the string currents are now compared to this mean value in the 5 minute polling interval. If all the
string currents lie within the set tolerance of 10%, no addition is carried out.
If, however, a string shows a string current of 6 A, then the difference between the actual string
current of 6 A and the tolerance limit of 5.5 A is added to the total. The difference is 0.5 A, which
is a deviation of 10% from the mean value. This difference of 10% is now added to the total until
the error sum of 20% is reached.
The error sum is reached when the error remains the same for two polling intervals. The data logger
sends the warning 380 "SMU".
Installation Guide SSM16-24-IA-IEN105120 17
3 Product Description SMA Solar Technology AG
If a string fails, the current difference in the above example is 4.5 A, which equates to a deviation
of 90% from the mean value. If the settings in the above example remain the same, i.e. tolerance at
10% and tripping time at 10 minutes, the error sum of 20% is already reached after the first polling
interval of 5 minutes. The data logger now sends an "SMU" warning.
3.3 String Fuses
The string fuses protect the modules of a PV plant from reverse currents.
Figure3:The principle of reverse current
Reverse current can occur when different open-circuit voltages are applied to modules connected in
parallel. In this event, the reverse current can be much higher than the module's short-circuit current.
The higher the reverse current, the higher the heat will rise in the modules of the faulty PV string.
Pronounced warming can destroy the modules of the faulty PV string.
Reverse current can have the following causes:
• Short circuit in one or more modules
• Short circuit in one or more cells in a module
• Double ground fault in a module
• Double ground fault in the cabling
The string fuses trip when the string current is too high and thus protect the modules of the faulty PV
string. The Sunny String-Monitor informs Sunny Central Control of the failure of the PV string.
In the case of grounded PV arrays, the positive or the negative pole can be grounded at the inverter.
To do this, cylindrical bridges are fitted in the Sunny String-Monitor instead of fuses.
18 SSM16-24-IA-IEN105120 Installation Guide
SMA Solar Technology AG 3 Product Description
3.4 Overvoltage Protection
Integrated surge arresters provide overvoltage protection. The surge arresters protect the inverters
from transient overvoltages. The integrated surge arresters can be monitored in the Sunny StringMonitor. To guarantee the functionality of the integrated surge arrester, this must be connected to an
external grounding. The connection to ground is provided by a ground terminal.
3.5 Remote Tripping
3.5.1 Remote Tripping as a Shunt Trip
The DC circuit breaker is fitted optionally with a remote trigger which is configured as a shunt trip.
The remote trigger with the shunt trip is used to switch off the DC circuit breaker in an electrically
controlled way. Action of the shunt trip is configured at a voltage between 70% … 110% of the
nominal voltage of the shunt trip U
tripped. The DC circuit breaker is controlled via a make contact.
The function of the shunt trip is not guaranteed if a cable breaks, a connection is loose, voltage is too
low or the voltage supply fails. We recommend the use of an uninterrupted voltage supply. The
activation time for safely activating the shunt trip is at least 3 seconds.
After it has been triggered remotely, the DC circuit breaker must be connected again manually.
. If a voltage is present at the shunt trip, the DC circuit breaker is
N
3.5.2 Remote Tripping as Undervoltage Release
Th e DC cir cui t br eak er i s fi tte d optiona lly wit h a r emo te t rig ger whi ch i s co nfi gur ed as an un der vol tag e
release.
Remote tripping with the undervoltage release is used to switch off the DC circuit breaker in an
electronically controlled way. The DC circuit breaker is tripped when there is no voltage at the
undervoltage release, or if the voltage falls below 85% of the nominal release voltage UN. After
tripping, the DC circuit breaker can be connected again after the voltage rises above 85% of the
undervoltage release nominal voltage UN.
In order to avoid an inadvertent tripping, we recommend an uninterrupted power supply. The
undervoltage release is designed for continuous operation. Activation takes place via a normally
closed contact. The minimum interruption time for reliable tripping of the undervoltage release is
1 second.
After it has been triggered remotely, the DC circuit breaker must be connected again manually.
3.6 Type Label
The purpose of the type label is to identify the Sunny String-Monitor. You will find the type label on
the inside of the right door and on the right external wall of the Sunny String-Monitor. You will find the
following information on the type label:
• Type (Type/Model)
•Serial number (Serial No.) of the Sunny String-Monitor
Installation Guide SSM16-24-IA-IEN105120 19
4 Scope of Delivery SMA Solar Technology AG
4Scope of Delivery
4.1 Sunny String-Monitor SSM16-11
Check the scope of supply for completeness and any visible external damage. Please contact your
supplier if the delivery is not complete or you find any damage.
Figure4:Sunny String-Monitor SSM16-11 - scope of delivery
Position Quantity Designation
A 1 Sunny String-Monitor SSM16-11
B1Base
*
C 1 Switch cabinet key
D2Mounting rail
E8Screw
F 0/16 Cylindrical bridges
G 16/32 Fuses
H 32/64 DC plug connector +pole
20 SSM16-24-IA-IEN105120 Installation Guide
*
*
*
*
*
SMA Solar Technology AG 4 Scope of Delivery
Position Quantity Designation
I 32/64 DC plug connector -pole
K 32/64 Sealing plugs for DC plug connectors
*
*
L 1 Installation guide
M 1 Circuit diagram
*
optional
4.2 Sunny String-Monitor SSM24-11
Check the scope of supply for completeness and any visible external damage. Please contact your
dealer if the delivery is not complete or you find any damage.
Figure5:Sunny String-Monitor SSM24-11 - scope of delivery
Position Quantity Designation
A 1 Sunny String-Monitor SSM24-11
B1Base
*
C 1 Switch cabinet key
D2Mounting rail
Installation Guide SSM16-24-IA-IEN105120 21
*
4 Scope of Delivery SMA Solar Technology AG
Position Quantity Designation
E8Screw
F 0/24 Cylindrical bridges
G 24/48 Fuses
H 48/96 DC plug connector +pole
I 48/96 DC plug connector -pole
K 48/96 Sealing plugs for DC plug connectors
*
*
*
*
*
*
L 1 Installation guide
M 1 Circuit diagram
*
optional
22 SSM16-24-IA-IEN105120 Installation Guide
SMA Solar Technology AG 5 Assembly
%"/(&3
5Assembly
5.1 Base Mounting
5.1.1 Selecting the Mounting Location
Danger to life due to fire or explosion.
• Do not install the Sunny String-Monitor on flammable construction materials.
• Do not install the Sunny String-Monitor near highly flammable materials.
• Do not install the Sunny String-Monitor in potentially explosive areas.
Requirements:
☐ The mounting location is not an escape route, nor in a residential or office area.
☐ The mounting location must be easily accessible for maintenance work.
☐ The mounting location is shaded.
☐ The mounting location is protected from rain as far as possible.
Installation Guide SSM16-24-IA-IEN105120 23
5 Assembly SMA Solar Technology AG
1 060 mm
595 mm
595 mm
245 mm
Figure6:Arrangement of the cables in the base area
Position Designation
APV+ string cable
B Grounding cable, RS485 communications cable, cable for remote tripping
(optional)
C DC main cable to Sunny Central
DPV‒ string cable
5.1.2 Mounting the Base
Figure7:Dimension of the support for the base
24 SSM16-24-IA-IEN105120 Installation Guide
SMA Solar Technology AG 5 Assembly
/05*$&
/05*$&
1. Dig a pit. Note the depth of the pit on the base. Tip: the maximum depth of the pit is marked on
the sides of the Sunny String-Monitor.
2. Set the base in the pit with the side of the kick plate facing forwards.
3. Remove the upper kick plate.
4. Presort the output cables according to location and place in the base.
5. Half-fill the pit with gravel or sand. Use a grain from 2 mm … 4 mm.
6.
Penetrating moisture can lead to condensation, corrosion, and leakage currents.
Using the base filler stops condensation forming.
• Fill the remaining space around the base with base filler. Use a grain from 4 mm … 8 mm.
5.1.3 Mounting the Sunny String-Monitor on the Base
Damage to the cable glands and plug connections due to improper transport and
installation.
The cable glands and plug connections protrude from the enclosure.
• When transporting and mounting the Sunny String-Monitor, ensure that the cable glands and
plug connections are not damaged.
1. Loosen the 4 fixing screws on the bottom plate of
the Sunny String-Monitor.
2. Remove the upper kick plate.
3. Place the Sunny String-Monitor on the base.
4. Fix the Sunny String-Monitor to the base using the screws that were previously removed.
5. Insert all the output cables through bottom plate into the Sunny Strong-Monitor, and fasten to
the internal cable support rail.
6. In order to stop the kick plate from being opened by unauthorized persons, fit the two safety
bolts to the inner side of the bottom plate.
Installation Guide SSM16-24-IA-IEN105120 25
5 Assembly SMA Solar Technology AG
%"/(&3
5.2 Wall Mounting
5.2.1 Selecting the Mounting Location
Danger to life due to fire or explosion.
• Do not install the Sunny String-Monitor on flammable construction materials.
• Do not install the Sunny String-Monitor near highly flammable materials.
• Do not install the Sunny String-Monitor in potentially explosive areas.
☐ The mounting location is not an escape route, nor in a residential or office area.
☐ The mounting wall can support the weight of the Sunny String-Monitor.
☐ The mounting location must be easily accessible for maintenance work.
☐ Mounting location is shaded.
☐ The mounting location is protected from rain as far as possible.
• Include external cable support rail.
• Mount the Sunny String-Monitor so that the connection area is pointing downward.
• Do not mount the Sunny String-Monitor flat on its back or leaning.
• If the PV array has a stand, place the
SunnyString‑Monitor on the PV array stand in the
shade.
26 SSM16-24-IA-IEN105120 Installation Guide
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