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Summary of Contents for SMA STRING-MONITOR SSM-U-2410
- Page 1 Technical Information SMA STRING-MONITOR SSM-U-XX10 / SSM-U-XX15 SSMUXX1015-TI-en-10 | Version 1.0 ENGLISH...
- Page 2 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 in detecting failures, thus helping to minimize power and yield losses.
- Page 3 1 Overview of Product Details SMA Solar Technology AG • The SMA String-Monitor is equipped with a double-bit key for the switch cabinet. Profile half-cylinders are available 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.
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Page 4: Product Description
Circuitry Options with Inline String Fuses The string fuses for the SMA String-Monitor are integrated as so-called "inline string fuses" on the outside of the enclosure in the string connection. The string terminals of the SMA String-Monitor are equipped with DC connectors from the SUNCLIX product range of Phoenix Contact. - Page 5 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)
- Page 6 DC Load-Break Switch The SMA String-Monitor is equipped with a multi-terminal DC load-break switch with a viewing window for the contacts. The DC load-break switch disconnects the PV array connected to the SMA String‑Monitor from the inverter. Disconnection takes place at all poles.
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Page 7: System Design
In case the irradiation is higher, the rated current must be adapted linearly downwards. Fuse Rating If you are using the inline fuse connectors offered by SMA Solar Technology AG, you can find information on the fuse rating in the Technical Information "IFCON Inline Fuse Connector Set16". - Page 8 3 System Design SMA Solar Technology AG However, the UV radiation does not impact the functionality and the insulation of the plastic enclosure of the SMA String-Monitor. Over time, merely the color and condition of the enclosure surface might change slightly.
- Page 9 SMA Solar Technology AG 4 Mounting You can mount the SMA String-Monitor to a wall or to a round or square pole. The material for pole mounting is available as an accessory (see Section 8, page 24). Requirements for the mounting location: ☐...
- Page 10 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 shaded position. Make sure that the SMA String-Monitor enclosure is not mounted in the path of water flowing off the module surface.
- Page 11 4 Mounting SMA Solar Technology AG Strain Relief for Cables Strain relief for the cables must be provided for mounting. Strain relief can be effected by means of an external cable support rail. The cable support rail is not included in the scope of delivery.
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Page 12: Installation
Installing the String Cables The string cables of the PV arrays are connected to the string cables of the SMA String-Monitor via DC connectors. The string cables of the PV arrays must be equipped with DC connectors for this. The DC connectors are available as an accessory (see Section 8, page 24). - Page 13 5 Installation SMA Solar Technology AG Installing the DC Main Cables You 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 required depending on the type of connection and cable.
- Page 14 5 Installation SMA Solar Technology AG Cable type Conductor cross-section per potential Sectoral, single-strand 70 mm to 240 mm Sectoral, multi-strand 70 mm to 240 mm SSMUXX1015-TI-en-10 Technical Information...
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Page 15: Network Topology
6 Network Topology Network Topology Up to ten SMA String-Monitors can be connected to each string monitoring communication connection of the inverter in line topology (number of connections for string monitoring communication see the inverter manual). Figure 9: Network topology with SMA String-Monitor (example) - Page 16 6 Network Topology SMA Solar Technology AG Information on communication options of the inverter can be found in the inverter manual. Figure 10: Communication options (example) Position Designation SMA String-Monitor Inverter (example) Ethernet communication Optical fiber communication SSMUXX1015-TI-en-10 Technical Information...
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Page 17: Technical Data
Minimum clearance between enclosure and floor if inline 800 mm fuse connectors are installed underneath the SMA String- Monitor * 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 Technical Information... -
Page 18: Current Measurement
7 Technical Data SMA Solar Technology AG Electrical Data Rated voltage 1,000 V / 1,500 V At installation altitudes over 2,000 m, an additional re- 2,001 m to 3,000 m reduction by 1.0% per 100 m duction factor must be taken into account. 3,001 m to 4,000 m reduction by 1.2% per 100 m Rated current (I ) at 50°C*... - Page 19 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 mm...
- Page 20 7 Technical Data SMA Solar Technology AG 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 the...
- Page 21 7 Technical Data SMA Solar Technology AG Digital Input (Customer) Conductor cross-section 0.08 mm to 1.00 mm Maximum cable length 30 m Cable gland Multiple feed-through Sealing range of cable gland 3.2 mm to 6.5 mm Digital Input for Alarm Contact* for DC Load-Break Switch Quantity...
- Page 22 7 Technical Data SMA Solar Technology AG Digital Output Minimum electrical endurance when the maximum switch- 1,000,000 switching cycles ing voltage and maximum switching current are complied with Terminal Spring-cage terminal with actuation lever on the electronic assembly Conductor cross-section 0.5 mm...
- Page 23 7 Technical Data SMA Solar Technology AG 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 Technical Information...
- Page 24 8 Accessories SMA Solar Technology AG 8 Accessories You will find the accessories for your product in the following overview. If required, these can be ordered from SMA Solar Technology AG or your distributor. Designation Brief description SMA order number...
- Page 25 SMA order number Power supply assembly for external Assembly for external 230 V sup- SSSM-U-AUXPB power supply of SMA String-Moni- ply voltage of the SMA String-Moni- tors tor via the inverter V box terminal set for the V box terminals with connection AFC-300 SMA String-Monitors SSM-U and...
- Page 26 SMA Solar Technology www.SMA-Solar.com...
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