Technical Information - SMA STRING-MONITOR SSM-U-XX10 / SSM …files.sma.de/dl/26599/SSMUXX1015-TI-en-10W.pdf · 2018-10-16 · • The SMA String-Monitor is equipped with a double-bit

Technical InformationSMA STRING-MONITOR SSM-U-XX10 / SSM-U-XX15

SSMUXX1015-TI-en-10 | Version 1.0 ENGLISH

1 Overview of Product Details

Product Description• The SMA String-Monitor is a PV array junction box for outdoor areas to which several strings can be connected in

parallel. The SMA String-Monitor collects, measures and monitors the input currents of the strings, assists indetecting failures, thus helping to minimize power and yield losses.

• The measured values are transmitted from the SMA String-Monitor via Ethernet to the next SMA String-Monitor inthe communication bus up to the inverter. Distances of up to 100 m between the nodes are possible when usingcopper cables. Greater distances of up to 2,000 m between two nodes are possible via optical fibers (seeSection 8, page 24).

• The number of SMA String-Monitors connectable to an inverter depends on the DC inputs of the inverter. OneSMA String-Monitor per DC input can be connected to the inverter.

• Up to ten SMA String-Monitors can be connected in line topology to each string monitoring communicationterminal of the inverter (for information on the number of string monitoring communication terminals, see theinverter manual).

• The SMA String-Monitor is equipped with a DC load-break switch. The DC load-break switch can disconnect thePV array connected to the SMA String-Monitor from the inverter.

• The SMA String-Monitor may only be operated if the strings are protected with fuses. SMA Solar Technology AGguarantees the safe operation of the SMA String-Monitors in combination with inline fuse connectors as stringfuses and when the inline fuse connectors are connected directly to the DC connectors of the string cables of theSMA String-Monitor. Using a different type and location of fuses for the strings does not guarantee the safeoperation of the SMA String-Monitor and the observance of the thresholds by SMA Solar Technology AG. Theinline fuse connectors are available as an accessory (see Section 8, page 24).

• There are six SMA String-Monitor models available depending on the system voltage and on the number of PVinputs to be monitored:

– The SSM-U-XX10 is suitable for voltages of up to 1,000 VDC and is available with XX = 16, 24 or 32 PVinputs.

– The SSM-U-XX15 is suitable for voltages of up to 1,500 VDC and is available with XX= 16, 24 or 32 PVinputs.

Equipment and Equipment Options• Depending on the product option, the SMA String-Monitor is equipped with 16, 24 or 32 measuring channels.

Different numbers of string inputs and string fuses can be assigned to the measuring channels. This allows you toachieve the optimum design for your PV system and to protect the PV array from reverse currents.

• The interior of the SMA String-Monitor is equipped with protective covers for the lower DC input area and for theupper DC output area. This facilitates working on the disconnected lower DC input area in the SMA String-Monitor without having to disconnect the DC output area from voltage sources on the inverter side.

• The string fuses are attached on the outside of the enclosure of the SMA String-Monitor. This prevents additionalheat in the enclosure caused by the waste heat of the string fuses.Inline fuse connectors of the SUNCLIX plug-in system by Phoenix Contact with internal gPV fuse are available asan accessory. The inline fuse connectors are connected to the pre-installed DC connectors of the string cables ofthe SMA String-Monitor.The inline fuse connectors can be connected to the positive and/or negative terminal of the PV inputs and areavailable in different electrical current strengths.

• The SMA String‑Monitor is equipped with a type II overvoltage protection. This protects the inverter againstovervoltage. The SMA String-Monitor can be additionally equipped with a type II overvoltage protection for thecommunication connection and for the 230 VAC voltage supply of the SMA String-Monitor.

1 Overview of Product Details SMA Solar Technology AG

Technical InformationSSMUXX1015-TI-en-102

• The SMA String-Monitor is equipped with a double-bit key for the switch cabinet. Profile half-cylinders areavailable upon request from the manufacturer of the SMA String-Monitor enclosure.

• DC connection:– You can connect up to two DC main cables per terminal by default.– You can connect DC main cables from 70 mm2 to 400 mm2 made of aluminum or copper to the busbar in

the SMA String-Monitor by means of terminal lugs. Only tin-plated copper tube terminal lugs for coppercables or bimetal tube terminal lugs for aluminum cables are permitted.

– You can connect DC main cables from 70 mm2 to 300 mm2 made of aluminum or copper to the V-boxterminals in the SMA String-Monitor. The V-box terminals are available as an accessory.

– For connecting the tube terminal lugs or the V-box terminals, the required material for the bolted connection ispre-mounted on the busbars.

• DC load-break switch:– The DC load-break switch is equipped with a viewing window for the contacts.– To receive feedback on the switching state of the DC load-break switch, an alarm contact is available as an

accessory (see Section 8, page 24).

1 Overview of Product DetailsSMA Solar Technology AG

Technical Information 3SSMUXX1015-TI-en-10

2 Product Description

2.1 Circuitry Options with Inline String FusesThe string fuses for the SMA String-Monitor are integrated as so-called "inline string fuses" on the outside of theenclosure in the string connection. The string terminals of the SMA String-Monitor are equipped with DC connectorsfrom the SUNCLIX product range of Phoenix Contact. Suitable for the SUNCLIX plug-in system, inline fuse connectors(see Section 2.2, page 6) and Y adapters are available from SMA Solar Technology AG as accessories (seeSection 8, page 24).The string terminals are located outside of the enclosure of the SMA String-Monitor. This offers several options for thecircuitry and fuse protection of the strings.

One-Sided Fuse Protection with Inline Fuse Connector on the Positive or Negative Terminal

Figure 1: One-sided fuse protection with inline fuse connector on the positive terminal (example)

Two-Sided Fuse Protection with Inline Fuse Connector on the Positive or Negative Terminal

Figure 2: Two-sided fuse protection with inline fuse connector on the positive or negative terminal (example)

Two Strings on One Fuse via Y Adapter

Figure 3: Two strings on one fuse via Y adapter (example)

2 Product Description SMA Solar Technology AG


Two Fuses on One String via Y Adapter

Figure 4: Two fuses on one string via Y adapter (example)

Connection of Pre-Fabricated Cable Harnesses with Integrated String Fuse

Figure 5: Connection of pre-fabricated cable harnesses with integrated string fuse (example)

Position Designation

A PV module

B DC connector (positive terminal)

C Inline fuse connector

D DC connector (negative terminal)

E Y adapter

F Integrated string fuse

G SMA String-Monitor

2 Product DescriptionSMA Solar Technology AG


2.2 Inline Fuse Connector as Inline String FuseThe DC connectors and the inline fuse connectors are from the SUNCLIX plug-in system by Phoenix Contact and canbe installed by easily plugging them together. For further information on this subject, see the Technical Information"IFCON Inline Fuse Connector Set16".

Design of the Inline Fuse Connector by Phoenix Contact

Figure 6: Design of the inline fuse connector by Phoenix Contact


A Plug-in contact (pin) from the SUNCLIX plug-in system

B Enclosure

C Electronic string fuse

D Connection of the plug-in contact with the fuse

E Plug-in contact (pin connector) from the SUNCLIX plug-in system

2.3 DC Load-Break SwitchThe SMA String-Monitor is equipped with a multi-terminal DC load-break switch with a viewing window for thecontacts. The DC load-break switch disconnects the PV array connected to the SMA String‑Monitor from the inverter.Disconnection takes place at all poles.An alarm contact for the switching status of the DC load-break switch is available as an accessory (see Section 8,page 24).

Upstream LV/HRC fuses requiredUse of the DC load-break switch is only permissible if LV/HRC fuses with gPV characteristic are installed upstreamin the inverter or the main DC distribution box.

2 Product Description SMA Solar Technology AG


3 System Design

3.1 Design ConsiderationsWhen designing an SMA String-Monitor, take the following aspects into account:

• Maximum current values• Fuse rating• Specifics for installation altitudes over 2,000 m• Ambient temperatures over 50°C

3.2 Maximum Current ValuesThe following current values must not be exceeded:

• Rated current (IDCmax) up to 50°C: 315 ADC

• Rated current (IDCmax) over 50°C: reduction by 2.5% per K• Rated current per measurement input: 17.5 ADC

The following applies:IString_max = IDC_max / number of string inputs ≤ 17.5 AThe rated current applies for a maximum irradiation of 1,200 W/m2 (hourly average value of the horizontal globalradiation). In case the irradiation is higher, the rated current must be adapted linearly downwards.

3.3 Fuse RatingIf you are using the inline fuse connectors offered by SMA Solar Technology AG, you can find information on the fuserating in the Technical Information "IFCON Inline Fuse Connector Set16".If you are using other fuses, you can find information on the fuse rating in the datasheet of the fuse manufacturer.When selecting the fuse nominal values (Inom), a reduction factor according to the manufacturer specifications for theshort-circuit current of the connected PV array under standard test conditions (ISC_STC) needs to be applied.The following applies:ISC_STC ≤ Inom x reduction factor or Inenn ≥ ISC_STC / reduction factor

3.4 Specifics for installation altitudes over 2,000 m

3.4.1 Reduction of Maximum Fuse CurrentWhen installing at altitudes over 2,000 m, an additional reduction factor for the fuse rating needs to be taken intoaccount (when using the inline fuse connectors offered by SMA Solar Technology AG, see the Technical Information"IFCON Inline Fuse Connector Set16"; when using other fuses, see the datasheet of the fuse manufacturer).

3.4.2 Reduction of the Electrical Parameters of the DC Load-Break SwitchThe current is not being reduced.The rated voltage is reduced as follows:

• For installation altitudes of 2,001 m to 3,000 m = reduction by 1.0% per 100 m• For installation altitudes of 3,001 m to 4,000 m = reduction by 1.2% per 100 m

3.4.3 UV RadiationUV radiation increases by approximately 1.5% for every 100 m of altitude. For example, the UV radiation at analtitude of 4,000 m is approximately 30% stronger than at an altitude of 2,000 m.UV radiation has damaging effects on plastics.

3 System DesignSMA Solar Technology AG


However, the UV radiation does not impact the functionality and the insulation of the plastic enclosure of the SMAString-Monitor. Over time, merely the color and condition of the enclosure surface might change slightly.

3 System Design SMA Solar Technology AG


4 MountingYou can mount the SMA String-Monitor to a wall or to a round or square pole. The material for pole mounting isavailable as an accessory (see Section 8, page 24).

Requirements for the mounting location: The mounting location can be outdoors or indoors. The mounting location must be shaded, e.g. under a protective roof. The mounting location must be suitable for the weight and dimensions of the SMA Sunny String‑Monitor. The mounting location must be suitable for the wind load. Mounting space below the SMA String Monitor when using the inline fuse connectors:

at least 800 mm.

Pole requirements: Permissible pole diameter for round pole respectively pole width for square pole:

160 mm to 370 mm The pole must be in a vertical position. The pole must be suitable for the weight of the SMA String Monitor. Weight of the SMA String-Monitor without

accessories: 35 kg.

Dimensions:

Figure 7: Dimensions of the SMA String-Monitor

Position Explanation

A 630.00 mm

B 600.00 mm

C 573.00 mm

4 MountingSMA Solar Technology AG



D 825.60 mm

E 850.00 mm

F 250.00 mm

Observe minimum clearances:

Figure 8: Minimum clearances


A 200 mm

B 650 mm

C 800 mm

D 150 mm

E 650 mm

Example: mounting on the PV array structure• If the PV array is mounted on a free-standing structure, the

SMA String‑Monitor can be fixed to this structure in a shadedposition. Make sure that the SMA String-Monitor enclosure isnot mounted in the path of water flowing off the modulesurface.

4 Mounting SMA Solar Technology AG


Strain Relief for CablesStrain relief for the cables must be provided for mounting. Strain relief can be effected by means of an external cablesupport rail. The cable support rail is not included in the scope of delivery.

4 MountingSMA Solar Technology AG


5 Installation

5.1 Installing the Ethernet CablesUp to ten SMA String-Monitors can be connected to each string monitoring communication connection of the inverterin line topology (number of connections for string monitoring communication see the inverter manual).The Ethernet cables are connected to the LSA+ terminals of the electronics assembly using LSA+ punch down tools.

Interference in data transmission due to unshielded power cablesIf unshielded power cables are used, they generate an electromagnetic field during operation which may induceinterference in network cables during data transmission.

• When laying network cables, observe the following minimum clearances to unshielded energy cables:– For installation without separating strip: at least 200 mm– For installation with aluminum separating strip: at least 100 mm– For installation with steel separating strip: at least 50 mm

Requirements for Ethernet cables: Cable type: copper, two-conductor Number of insulated conductor pairs and insulated conductor cross-section: 4 x 2 x 0.125 mm2 to 0.205 mm2

Cable type: at least Cat5 with shielding S-UTP, F-UTP or higher Maximum cable length: 100 m The Ethernet cable must be connected in accordance with EIA/TIA 568B (8-conductor):

Signal EIA/TIA 568B (8-conductor) Insulated conductor color

TX+ White/orange

TX- Orange/white or orange

RX+ White/green

Not assigned Blue/white or blue

Not assigned White/blue

RX- Green/white or green

Not assigned White/brown

Not assigned Brown/white or brown

5.2 Installing the String CablesThe string cables of the PV arrays are connected to the string cables of the SMA String-Monitor via DC connectors. Thestring cables of the PV arrays must be equipped with DC connectors for this. The DC connectors are available as anaccessory (see Section 8, page 24). The DC connectors are pre-installed on the string cables of the SMA String-Monitor.

Damage to the SMA String-Monitor due to moisture penetrationIn order to protect the enclosure of the SMA String Monitor from moisture, all unused DC inputs must be closedwith suitable protective caps on the DC connectors. The protective caps are available from Phoenix Contact.

5 Installation SMA Solar Technology AG


5.3 Installing the DC Main CablesYou can connect up to two DC main cables per terminal by default.The material required for the bolted connections is already pre-mounted on the busbar; further material is requireddepending on the type of connection and cable. Depending on the cable cross-section, the DC main cables must beconnected to the busbars via terminal lugs or V-box terminals:The following options are available for connecting the DC main cables:

Connecting DC Main Cables to the Busbar Using Terminal Lugs• DC main cables 70 mm2 to 400 mm2 made of aluminum or copper

– Aluminum cables: additionally required material: bimetal ring terminal lugs.– Copper cables: tinned copper ring terminal lugs are pre-mounted.

Connecting DC Main Cables to the Busbar Using V-Box Terminals• DC main cables 70 mm2 to 300 mm2 made of aluminum or copper

Additionally required material: V-box terminals (see Section 8, page 24).

Connecting the DC Main Cables with Terminal Lugs

Cable requirements for connection with terminal lugs: Use copper or aluminum cables only. The cables must be designed for the maximum PV voltage. Maximum number of cables per potential: 2 Permitted cable cross-section: 70 mm2 to 400 mm2

Terminal lug requirements: Use tin-plated terminal lugs only. For the connection, only the supplied screws, washers and nuts must be used. The terminal lugs must be designed according to the temperature. Temperature: +95°C The width of the terminal lugs must exceed the washer diameter. Washer diameter: 32 mm. This will ensure that

the defined torques are effective over the whole surface. Maximum width of the terminal lugs when connecting two cables per potential: 48 mm

Connecting the DC Main Cables with V-Box TerminalsThe DC main cables are connected directly to the busbars with V-box terminals. The V-box terminals are available asan accessory.

Cable requirements for connection with V box terminals: Use copper or aluminum cables only. The cables must be designed for the maximum PV voltage. The cables must have double or reinforced insulation. Maximum number of cables per potential: 2 Permitted cable cross-section: 70 mm2 to 300 mm2

Permitted conductor cross-section:

Cable type Conductor cross-section per potential

Round, single-strand 70 mm2 to 150 mm2

Round, multi-strand 70 mm2 to 300 mm2

5 InstallationSMA Solar Technology AG


Cable type Conductor cross-section per potential

Sectoral, single-strand 70 mm2 to 240 mm2

Sectoral, multi-strand 70 mm2 to 240 mm2

5 Installation SMA Solar Technology AG


6 Network Topology

Network TopologyUp to ten SMA String-Monitors can be connected to each string monitoring communication connection of the inverterin line topology (number of connections for string monitoring communication see the inverter manual).

Figure 9: Network topology with SMA String-Monitor (example)


A SMA String-Monitor

B Inverter (example)

Communication OptionsThe SMA String-Monitor is equipped by default with Ethernet communication. Distances of up to 100 m between twonodes can be bridged via Ethernet. The SMA String-Monitor can be retrofitted with optical fiber communication, ifrequired (see Section 8, page 24). Distances of up to 2,000 m between two nodes can be bridged via optical fibercommunication.Both communication types can be combined between two SMA String-Monitors, meaning that you can use Ethernetcommunication and/or optical fiber communication for the communication input and for the communication outputdepending on the distance to be bridged.

6 Network TopologySMA Solar Technology AG


Information on communication options of the inverter can be found in the inverter manual.

Figure 10: Communication options (example)


A SMA String-Monitor

B Inverter (example)

C Ethernet communication

D Optical fiber communication

6 Network Topology SMA Solar Technology AG


7 Technical DataEnclosure

Outdoor installation Shaded

Material Glass-fiber reinforced plastic

Combustion properties Self-extinguishing, halogen-free

IP degree of protection in accordance with IEC 60529 IP54

IK degree of protection in accordance with IEC 62262 IK10

Protection class in accordance with IEC 60529 II

Pollution degree in accordance with IEC 61010-1 2

Color RAL 7035

UV resistance in accordance with IEC 61439-1 Yes

Wall mounting Yes

Pole mounting* Yes

Lock cylinder Double-bit key for switch cabinet

Cable support rail** Yes* available as an accessory (see Section 8, page 24)

** to be provided by the customer

Mechanical Data

Enclosure width 600 mm

Enclosure with including vent plug 630 mm

Enclosure height including wall bracket lugs 850 mm

Enclosure height including string cable harness 1,055 mm

Enclosure depth 300 mm

Enclosure depth including wall bracket lugs 320 mm

Enclosure depth including wall bracket lugs and polemounting bracket*

385 mm

Maximum weight** 34 kg

Weight of pole mounting bracket* 2.1 kg

Minimum clearance between enclosure and floor if inlinefuse connectors are installed underneath the SMA String-Monitor

800 mm

* available as an accessory (see Section 8, page 24)** depending on the number of string inputs of the SMA String-Monitor, without accessories

Electrical Data

PV array Negatively grounded/positively grounded/insulated

7 Technical DataSMA Solar Technology AG


Electrical Data

Rated voltageAt installation altitudes over 2,000 m, an additional re-duction factor must be taken into account.

1,000 VDC / 1,500 VDC

2,001 m to 3,000 m reduction by 1.0% per 100 m3,001 m to 4,000 m reduction by 1.2% per 100 m

Rated current (IDCmax) at 50°C* 315 ADC

Rated current (IDCmax) at above 50°C* Reduction by 2.5% per K

Rated current per measuring input* 17.5 ADC

Fuse characteristics gPV

Number of string inputs per potential 16 / 24 / 32

DC supply voltage from PV array +200 VDC to +1,500 VDC

External AC supply voltage** 230 VAC ±20%

DC load-break switch 400 ADC

DC load-break switch - actuation under load Max. 200 switching cycles

DC load-break switch - actuation at ‒40°C

Max. 100 switching cycles

Surge arrester DC Type 2 (monitored)Inom = 20 kAImax = 40 kA

Overvoltage category II* Maximum continuous operating current up to the specified ambient temperature, taking a maximum irradiation up to 1,200 W/m2 into

account (hourly average value of the horizontal global radiation). In case the irradiation is higher, the rated current must be adaptedlinearly downwards.

** available as an accessory (see Section 8, page 24)

Current Measurement

Number of measuring channels 16 / 24 / 32

Current measurement range −2.5 A to +17.5 A

Maximum error at +25°C* ±0.5%

Maximum error in temperature range* ±1.0%* based on the end value of the current measurement range

Voltage Measurement

Number of measuring channels 1

Voltage measurement range +250 VDC to +1,500 VDC


Maximum error in temperature range* ±1.0%* based on the current measurement range end value

7 Technical Data SMA Solar Technology AG


Measurement Internal Temperature SMA String-Monitor

Temperature measurement range −40°C to +100°C

Accuracy ±2% of measuring range end value

DC Main Connection to Busbar

Connection via busbar Ring terminal lugs for M12 screw

Maximum conductor cross-section 400 mm2

Suitable connection material Copper/aluminum*

Number of cables per potential 1 / 2

Cable gland M50

Sealing range of cable glands** 17.0 mm to 38.5 mm* with suitable terminal lug (see Section 5.3, page 13)

** Tightness of seal must be assured using the mounted seal insert or the size-reducing seal insert supplied

DC Main Connection to Box Terminals*

Type of terminal V-Box terminal

Maximum conductor cross-section 300 mm2

Suitable connection material Copper/aluminum

Number of cables per potential 1 / 2

Cable gland M50

Sealing range of cable gland** 17.0 mm to 38.5 mm* available as an accessory (see Section 8, page 24)

** Tightness of seal must be assured using the mounted seal insert or the size-reducing seal insert supplied

Connecting the String Cable to the DC Connector*

Cable type PV 1-F

Conductor cross-section at 6 mm2 DC connector 2.5 mm2 to 6.0 mm2

Cable diameter at 6 mm2 DC connector 5 mm to 8 mm

Conductor cross-section at 16 mm2 DC connector 6 mm2 to 16 mm2

Cable diameter at 16 mm2 DC connector 5.5 mm to 10.0 mm* available as an accessory (see Section 8, page 24)

Connection Functional Grounding to DC Surge Arrester

Terminal Connecting terminal plate with screw connection forgrounding conductor

Conductor cross-section for surge arrester type 2 25 mm2 to 35 mm2

Cable gland Multiple feed-through



Connection Functional Grounding to DC Surge Arrester

Sealing range of cable gland 5.0 mm to 10.2 mm

Recommended cable type NYY-O

Connection Functional Grounding to Electronic Assembly

Terminal Spring-cage terminal with actuation lever on theelectronic assembly

Conductor cross-section for surge arrester type 2 6 mm2



Recommended cable type NYY-O

Interfaces for Temperature Measurement

Number (module/ambient temperature) 2

Plug-in temperature sensor PT100 and PT1000 with two-, three- and four-wiremeasurement

Measurement range −40°C to +100°C


Maximum error in temperature range* ±2.0%


Conductor cross-section 0.08 mm2 to 1.00 mm2


Sealing range of cable gland 3.2 mm to 6.5 mm* based on the measurement range end value (with four-wire measurement)

Digital Input (Customer)

Quantity 1

Supply voltage 24 VDC ±20%

Maximum output current (for sensors) 150 mA

Switching threshold, low level VLMAX 3 V

Switching threshold high level VHMIN 15 V

Nominal input voltage 24 VDC

Nominal input current 5 mA




Digital Input (Customer)


Maximum cable length 30 m



Digital Input for Alarm Contact* for DC Load-Break Switch

Quantity 1

Design Potential-free contact

Nominal input voltage (typical) 24 VDC

Nominal input current (typical) 5 mA

Terminal Supplied preassembled cable with plug contact* available as an accessory (see Section 8, page 24)

Analog Current Input

Quantity 1

Supply voltage 24 VDC ±20%

Maximum output current (for sensors) 150 mA

Input measurement resistance 250 Ω

Current measurement range 4 mA to 20 mA


Maximum error in temperature range* ±2.0%





Sealing range of cable gland 3.2 mm to 6.5 mm / 5.0 mm to 10.2 mm* based on the measuring range end value

Digital Output

Type Potential-free change-over contact

Maximum switching power AC 250 VAC / 2 A

Maximum switching power DC 24 VDC / 2 A48 VDC / 1 A



Digital Output

Minimum electrical endurance when the maximum switch-ing voltage and maximum switching current are compliedwith

1,000,000 switching cycles




Sealing range of cable gland 3.2 mm to 6.5 mm / 5.0 mm to 10.2 mm

Data Transmission Copper Wire

Data interface Modbus (TCP)

Local area network (LAN) Ethernet

Connection without surge arrester LSA+

Connection with surge arrester* RJ45

Recommended cable type Cat5 cable with shielding S-UTP, F-UTP or higher



Sealing range of cable gland 3.2 mm to 6.5 mm / 5.0 mm to 10.2 mm* available as an accessory (see Section 8, page 24)

Data Transmission Optical Fiber*

Data interface Modbus (TCP)

Local area network (LAN) Ethernet

Direct connection multimode optical fiber cable to opticalfiber Piggy-Back**

SC coupling

Fiber type Multimode 50.0/125.0 µm or 62.5/125.0 µm

Fiber grade OM1 or higher

Connection multimode optical fiber cable to splice box***

Splicing/optical fiber pigtail SC multimode


Sealing range of cable gland 3.2 mm to 6.5 mm / 5.0 mm to 10.2 mm* Accessory optical fiber Piggy-Back required OF Piggy-Back accessories required (see Section 8, page 24)

** available as an accessory (see Section 8, page 24)*** available as an accessory (see Section 8, page 24); optical fiber pigtail is not included in the accessory scope of delivery

Ambient Conditions

Standard operating temperature range ‒40°C to +50°C



Ambient Conditions

Extended operating temperature range ‒40°C to +60°C

Storage temperature ‒40°C to +70°C

Relative humidity* 0% to 95%

Maximum altitude above MSL 2,000 m / 4,000 m (derating)* condensation possible



8 AccessoriesYou will find the accessories for your product in the following overview. If required, these can be ordered from SMASolar Technology AG or your distributor.

Designation Brief description SMA order number

Inline fuse connector set Inline fuse connector set consisting of16 PV inline fuse connectors

See the Technical Information"IFCON Inline Fuse ConnectorSet16"

Y connector set (available soon) Y connector set consisting of 16 Yconnectors

• YCON16SFMM(female/2male)

• YCON16SMFF (male/2female)

PV connector set PV connector set consisting of 16connectors for the field wiring

• PVCON16S06F11 (2.5 mm2 to6.0 mm2 1,100 V (+))

• PVCON16S06M11 (2.5 mm2

to 6.0 mm2 1,100 V (‒))• PVCON16S06F15 (2.5 mm2 to

6.0 mm2 1,500 V (+))• PVCON16S06M15 (2.5 mm2

to 6.0 mm2 1,500 V (‒))• PVCON16S16F15 (6.0 mm2 to

16.0 mm2 1,500 V (+))• PVCON16S16M15 (6.0 mm2

to 16.0 mm2 1,500 V (‒))

Optical fiber interface module forSMA String-Monitors

Optical fiber interface module withmultimode SC coupling, type Piggy-Back for the SMA String-Monitor

SSM-U-FOPB

Optical fiber splice box set forSMA String-Monitors

Optical fiber splice box set MM withtwo SC/SC Duplex patch cables asretrofit kit for the SMA String-Monitor

SSM-U-FOSB

SSM-U pole mounting set Set for mounting the SMA String-Monitor to a pole

SSM-U-PM

Alarm Contact Kit for SMA String-Monitors

Alarm contact set 1 NO (make con-tact) for the switch state indicator forthe SMA String-Monitor

SSM-U-AUXCONT

Ethernet overvoltage protection setfor SMA String-Monitors

Overvoltage protection for the Ether-net communication of theSMA String-Monitor

SSM-U-COMOVP

Overvoltage protection set for supplyvoltage 230 VAC for SMA String-Monitors

Overvoltage protection for external230 VAC supply voltage of theSMA String-Monitor via the inverter

SSM-U-AUXPBOVP

8 Accessories SMA Solar Technology AG


Designation Brief description SMA order number

Power supply assembly for externalpower supply of SMA String-Moni-tors

Assembly for external 230 VAC sup-ply voltage of the SMA String-Moni-tor via the inverter

SSSM-U-AUXPB

V box terminal set for theSMA String-Monitors SSM-U andSSMxx-21-BS

V box terminals with connectionbrackets

AFC-300

8 AccessoriesSMA Solar Technology AG


SMA Solar Technology

www.SMA-Solar.com

Technical Information - SMA STRING-MONITOR SSM-U-XX10 / SSM …files.sma.de/dl/26599/SSMUXX1015-TI-en-10W.pdf · 2018-10-16 · • The SMA String-Monitor is equipped with a double-bit

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