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SSX — SMART STRING BOX
SSX — Smart String Box

Combiner Box monitoring

on PV plants

Smart String Box is integrated into PV string boxes and allows knowing the main parameters and detect possible failures in the PV modules.

SSX — Smart String Box-
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SSX — Smart String Box
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SSX — Smart String Box
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SSX — Smart String Box
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SSX — Smart String Box
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SSX — Smart String Box
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In the Box

1x SSX — Smart String Box
Screws to fasten the mounting plate
User Manual

Galery
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General

Certifications
Dimensions
Fixing holes
Output bus bar
Terminals
Dielectric Strength Voltage
Isolation Working Voltage
Primary conductor resistance
Relative humidity (%)
Weight

CE (IEC 61000-6-3:2007, IEC61000-6-2:2005, UEC61439-1:2011). UL 1741 (optional)
400 x 175 x 100 mm
6 x M4, 4 x M6
Brass, 25x10mm, 3 holes threaded M6
Cross section 1mm2 (with ferrule), 1.5mm2 (without ferrule)
4.8kVrms
1550 Vpk
0.85 mΩ
85% without condensation
1.5 kg

General

Certifications

CE (IEC 61000-6-3:2007, IEC61000-6-2:2005, UEC61439-1:2011). UL 1741 (optional)
Dimensions 400 x 175 x 100 mm
Fixing holes 6 x M4, 4 x M6
Output bus bar Brass, 25x10mm, 3 holes threaded M6
Terminals Cross section 1mm2 (with ferrule), 1.5mm2 (without ferrule)
Dielectric Strength Voltage 4.8kVrms
Isolation Working Voltage 1550 Vpk
Primary conductor resistance 0.85 mΩ
Relative humidity (%) 85% without condensation
Weight

 1.5 kg
Environment

Operating Temperature
Environment protection
Enclosure protection
Relative humidity (%)

-40ºC to 125ºC
Tropicalized
Policarbonate up to 115ºC
85% without condensation

Environment

Operating Temperature
Environment protection
Enclosure protection
Relative humidity (%)

-40ºC to 125ºC
Tropicalized
Policarbonate up to 115ºC
85% without condensation
Frequent Questions
Answers to frequently asked questions related to the Smart String Box
1. What is the Hall Effect about?
The Hall Effect is named after Edwin Hall, who in 1879 discovered that a voltage potential develops across a current-carrying conductive plate when a magnetic field passes through the plate in a direction perpendicular to the plane of the plate. SSX Webdom uses Hall Effect sensors to measure current generated by strings, and they can measure up to 40 Amperes of DC current per channel.
2. Why a datalogger embedded in the product?
In the event of a power outage, string boxes can continue to monitor the solar radiation or any other sensor connected to the analog inputs of Webdom SSX, which will be stored inside the solid state memory module of the datalogger. This is very useful to evaluate the energy losses due to power outages. In the case of a communications failure with the string boxes, the monitored data is stored in memory and can be recovered when communication is restored. Datalogger can store data up to 6 month, and firmware can be uploaded remotely.
3. What input/outputs are available in the Webdom SSX?
5x status LED, 2 x PT100/1000 temperature sensors, 1x4-20mA analog input, 1x0-10V analog input, 4xdigital inputs, 4 x digital outputs, 1xRS485 Isolated Modbus-RTU port. Digital input/outputs can be used to control external security sensors, like door intrusion of the same combiner box.
4. Can I install two electronic boards, one above the other?
Yes. If you do not have enough space to place two Webdom SSX modules inside the combiner box, they can be mounted one above the other, using separators. You can see an application note for 24 strings case, in the application notes area at the bottom of Webdom SSX product page.
5. What kind of communication cable should I use to interconnect various Combiner Boxes in a bus?
It is very important to use a shielded communication cables (eg Li-2YCYv 2x2x0.5) to minimize electromagnetic interference. The shield must be properly connected to earth, only one of the two cable ends, to avoid the problem of grounding loops. The best communication cable has twisted pair conductors, tinned copper braid and Aluminium-Polyester foiled (eg. Sumlene® Pos-CY). Characteristic Impedance (Z0) of the cable should be 120 ohm. The data transmission rate helps minimize interference problems, that is, better work than 9.6kbps 115.2Kbps.