SOL-SC-2ST-0-DC-12MPPT-1300EQS - String combiner box (SCB)
1460946

String combiner box for photovoltaic systems up to 1,000 V DC for connecting 12x 2 strings. Same number of input and output strings. With surge protection (type 1/2), DC fire department switch disconnector with remote access, and cable glands for the input and output side.

Product details








Compatible products



Your advantages

Fast installation and startup
Standard-compliant switchgear and controlgear assembly, thanks to use of DIN EN 61439
Application-oriented consultation
Large portfolio of string combiner boxes in stock

Frequently asked questions


How can I identify the equipment features of the Phoenix Contact SCB using the item designation?

Application note 111730 provides a description of the type key for the Phoenix Contact SCBs. You can use the type key to identify the SCB that has been delivered to you and derive its equipment features. The application note is available in the “Down... View more

Application note 111730 provides a description of the type key for the Phoenix Contact SCBs. You can use the type key to identify the SCB that has been delivered to you and derive its equipment features. The application note is available in the “Downloads” area on the SCB product page at www.phoenixcontact.com.

View less

What needs to be taken into account when planning and starting up a Phoenix Contact SCB with motorized fire department switch?

The PV strings are installed in the same way as all other Phoenix Contact SCBs. During planning, you only need to take into account a 230 V AC power supply for the motorized fire department switch.
 
The control of the fire department switch is... View more

The PV strings are installed in the same way as all other Phoenix Contact SCBs. During planning, you only need to take into account a 230 V AC power supply for the motorized fire department switch.
 
The control of the fire department switch is designed as an undervoltage release. This means that the DC circuits are closed when the 230 V AC power supply is applied. Interrupting or shutting down the 230 V AC power supply results in the DC circuits opening. Two unused terminal points per conductor (L+N) and two cable glands for cable entry are available on the SCB for connecting the AC power supply. This allows you to loop through the AC power supply from SCB to SCB.
 
Observe the maximum permissible connection cross-sections and the line protection for the 230 V AC power supply as well as the increasing nominal currents with several SCBs or motorized fire department switches on a common AC power supply.

View less

Should PV fuses be used to protect photovoltaic systems?

For Europe, HD 60364 Part 7-712 prescribes the following: PV fuses must be used in photovoltaic systems where more than two PV strings connected in parallel are installed per MPP tracker. This requirement applies because photovoltaic installations ha... View more

For Europe, HD 60364 Part 7-712 prescribes the following: PV fuses must be used in photovoltaic systems where more than two PV strings connected in parallel are installed per MPP tracker. This requirement applies because photovoltaic installations have to be short-circuit-proof.
 
In photovoltaic systems, the short-circuit current is almost in the nominal operating range. With one or two PV strings, the PV fuses do not have a protective function and even impair the system performance as they represent a potential source of error and also cause a slightly higher power dissipation.
 
With three or more PV strings connected in parallel, PV panels can be destroyed in the event of a double insulation fault due to a residual current or PV cables can be subjected to loads outside their nominal operating values. In this case, PV fuses make an important contribution to protecting the photovoltaic system and preventing downstream personal injury and damage to buildings.
The manufacturer’s data sheet provides information on the reverse current capacity of PV panels and the maximum fuse protection required for them.
 
Photovoltaic systems with DC power optimizers (e.g., from SolarEdge) are an exception. In some cases, power optimizers with up to three PV strings connected in parallel can prevent residual currents in the PV cables or PV panels. In this case, the use of PV fuses can be avoided. Please also observe the information provided by the power optimizer manufacturer.

View less

Is there an easy way to minimize cable losses in the photovoltaic system?

To reduce the cable losses of the photovoltaic system, larger cable cross-sections are required.
 
Phoenix Contact SCBs with SUNCLIX DC connectors enable the connection of cables with different cross-sections without tools. For some of these SC... View more

To reduce the cable losses of the photovoltaic system, larger cable cross-sections are required.
 
Phoenix Contact SCBs with SUNCLIX DC connectors enable the connection of cables with different cross-sections without tools. For some of these SCBs, cable cross-sections greater than 6 mm2 can be connected as standard. For the remaining SCBs with SUNCLIX DC connectors, connectors for a cable cross-section of up to 6 mm2 are enclosed for the DC output side by default.
However, connectors that are designed for larger cable cross-sections can also be used for these items in some cases. As a rule, the space at the connection area of the SCB is sufficiently sized for this.
 
The information on the maximum connectable cable cross-section of the SCB can be found in the technical data for the item in the “Connection data” area. The matching connectors can be found in the “Accessories” area on the product page.

View less

If fewer PV strings are connected to the SCB than is technically possible, does this affect the maximum current that can be connected per PV string?

For information on this, note the “MPP tracker total current” value in the “Electrical properties” area in the technical data for the item. To calculate the maximum current per PV string, this value must be divided by the number of connected PV strings.


May Phoenix Contact SCBs be used in unprotected outdoor areas?

Phoenix Contact SCBs have housings made from fiberglass-reinforced polycarbonate or polyester. The housings have a particularly high level of resistance and meet the IP65 degree of protection. However, the IP tests carried out in accordance with DIN ... View more

Phoenix Contact SCBs have housings made from fiberglass-reinforced polycarbonate or polyester. The housings have a particularly high level of resistance and meet the IP65 degree of protection. However, the IP tests carried out in accordance with DIN EN 60529 for the SCB housing are only comparative tests and are used to classify properties. They only take a few minutes and cannot simulate any real installation situation.
Long-term exposure to UV radiation with temporary peak intensity may also affect SCB components. For installation in unprotected outdoor areas, a canopy should be installed above the SCB.
Suitable canopies can be found in the “Accessories” area for the item.

View less

Does Phoenix Contact offer suitable SCBs for inverters with several input pairs per MPP tracker and limited input current for each connector pair, and are there any points to note for installation with these inverter types?

Compatible Phoenix Contact SCBs for this application are marked with the addition “EQ” in the item designation.
These SCBs connect the PV strings per position to one potential internally, integrate the surge protection via branch wiring, and then ... View more

Compatible Phoenix Contact SCBs for this application are marked with the addition “EQ” in the item designation.
These SCBs connect the PV strings per position to one potential internally, integrate the surge protection via branch wiring, and then split the PV strings again. The output cables on the SCB must have the same cross-section and the same cable length. In addition, each conductor connected to the SCB should, in the event of a fault, either be able to carry the entire short-circuit current per DC circuit or be protected by fuses of operating class gPV.

View less