General Details

Smart String Box – Passive

This high-quality ELECTROINVENT photovoltaic string box is intended to connect up to 30 PV module strings (depending on the type). The box is also used to disconnect the DC from the inverter. The Smart String Box (SSB) measures the current of each string and sends data to the inverter. This feature is essential for diagnostics and maintenance of PV-panels and cabling.
The SSB-P is powered directly by the PV strings.

 

 

Techical Info
SSB-P Type 10-10015-15020-20025-25030-300
Electrical Data
Maximum operating
voltage
U DC
1000 V DC
Fuses
PV(+) or PV(+) and PV(-)
Maximum output
DC current
I DCmax100 A           150 A           200 A           250 A           300 A          
Maximum number
PV inputs (strings)
  10                 15                 20                   25               30
Maximum input DC
current per string
I STRmax
10 A
String current
measurement
range
I STR
0 A to 10 A
Reverse string
current measuring
I STR rev
Yes
Surge arrester
Type II
Test voltage
2.5 kV, 50 Hz, 1 min
Power supply
Directly from PV strings
300 V DC (starting voltage) / 100-1200 V DC (operating voltage)
Maximum power consumption
5 W
Mechanical Data
DimensionsSee on next page????
Weight with fuses PV+ only28kg           29kg              30kg            47 kg          49 kg
with fuses PV+ and PV-30kg           35kg              36kg            49 kg          51 kg
Colour
RAL 7035 (light grey)
Enclosure material
Glass-fiber-reinforced and halogen-free polyester
Protection class according to EN 60529
IP54 (outdoor)
Impact strength according to
EN 62262
IK10
Maximum air humidity
0.95
Ambient temperature rangeT amb
–20 °C ... +60 °C
UV proof
Yes
Type
Multi-string monitor (MSM)
Status feedback (reverse current,
manual switch on/off,
surge arrester
fault indication)
Yes, via communication interface
String current monitoring
Yes, via communication interface
String voltage monitoring
Yes, via communication interface
Box temperature monitoring
Yes, via communication interface
Communication Interface
Fiber optical interface (default)
Ring type serial interface connection
RS 485 serial interface (optional)
Separable screw terminal with 6 pins for easy bus wiring. Galvanically isolated from monitoring electronic.
Standards
CE conformity / EMC
Yes / EN 61000-6-2, EN 61000-6-4 / EN 50178
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