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Solar Connection Box

The solar box allows easy interconnection of up to 4 solar panels or solar strings.

Multiple Junction Boxes can be connected in series to the maximum current and thus enable a tidy installation. A direct line with + Solar, -Solar and ground leads now to the island inverter or to the network power inverter. The solar box is equipped with WAGO terminals for connection. In addition  High Voltage Junction diodes per string and a varistor is fitted against indirect lightning strikes.

Specifications

Description

SB1

SB2

Maximum system voltage:

48V

1000V

Maximum current through solarbox:

50A

50A

Strings per Solarbox:           

4

4

Varistors + / Earth and -/ Earth:

45VDC each

670VDC each

Diode per conductor:            

1000V/10A

1000V/10A

Cable cross-section solar / String:

 4mm2

 4mm2

Inverter riser:   

 16mm2

 16mm2


Definition Solar Strings:

12V= 1 Panel                       (Open-circuit voltage ca. 22V)

24V= 2 Panel in Serie (Open-circuit voltage ca. 44V) 48V= 4 Panel in Serie (Open-circuit voltage ca. 88V)

 

Limit determination:

At the maximum system voltage of the possible open circuit voltage of the solar panels in series circuit (string interconnection) must be considered.

In the series connection of solar pit the sum of the panel or string currents must not exceed (ISC / short circuit) 50A.

Solarbox SB1
Solarbox SB1 outside the housing