samlexsolar SBC-2 User manual

Owner's
Manual
Please read this
manual before
installing your
connectors
Solar Panel
Branch
Connectors
SBC-2
1
4
GENERAL INFORMATION ON AN MC4 CONNECTOR SYSTEM
MC4 Connector Systems used to connect Samlex Solar Panels consist of male and female MC4 connectors and
branch connectors. This type of connector system is easy to install and uses “snap-in” safety locking tabs to
lock two mating connectors, thereby avoiding unintentional disconnection. Also, the mating contacts are
sealed against an ingress of dust and water. Specications are as follows:
• Contact diameter Ø 4 mm
• Maximum rated current - 30 A
• Maximum system voltage - 1000 V
• Degree of ingress protection when connected and properly locked - IP67
• Temperature range 40°C to +90°C
• TÜV Rheinland – type approved
MC4 Connectors (Fig. 1)
The MC4 Connectors and branch connectors mentioned in this manual have been designated “Male” and
“Female” based on the characteristics of the mating contact inserts inside the terminals.
In the MC4 Male Connector (1 of Fig. 1), the internal mating contact insert (2, Fig. 1) is a male pin. It has
two slots (3 of Fig. 1) for insertion of the two “snap-in” type of locking tabs (6 of Fig. 1) of the MC4 Female
Connector (4 of Fig. 1) for rm mating connection. This connector is marked "-".
In MC4 Female Connector (4, of Fig. 1), the internal mating contact insert (5 of Fig. 1) is a female cylindrical
socket. It has two “snap-in” type of locking tabs (6 of Fig. 1) that are inserted into the two slots (3 of Fig. 1) in
the MC4 Male Connector (1 of Fig. 1) for rm mating connection.
Wire is crimped to the contact inserts (2 and 5 of Fig. 1) using a special purpose crimping tool designed for
MC4 connectors. After the wire has been crimped, the contact insert is required to be seated securely inside
the housing and the strain relief / seal (7 of Fig. 1) is to be tightened fully to provide a water-tight seal.
1. MC4 Male connector (marked “-”)
2. Male contact insert
3. Slots for accepting “snap-in” type of locking tabs of the mating MC4 female connector
4. MC4 Female connector (marked “-”)
5. Female contact insert
6. “Snap-in” type of locking tabs of the mating with the slots on the MC4 female connector
7. Strain relief and seal
1
2
6
4
5
3
7
7
6
3
Fig. 1 . MC4 Male and Female Connectors
Note: Pairs of male/female MC4 connectors are sold separately. Samlex Model: MC4-2
11013-SBC-2-1121
MAN-10010
2 YEAR LIMITED WARRANTY
The SBC-2 Solar Panel Branch Connectors manufactured by Samlex America Inc.
(the “Warrantor“) are warranted to be free from defects in workmanship and materials
under normal use and service. The warranty period is 2 years for the United States and
Canada, and is in effect from the date of purchase by the user (the “Purchaser“).
Warranty outside of the United States and Canada is limited to 6 months. For a warranty
claim, the Purchaser should contact the place of purchase to obtain a Return Authoriza-
tion Number.
The defective part or unit should be returned at the Purchaser’s expense to the authorized
location. A written statement describing the nature of the defect, the date of purchase,
the place of purchase, and the Purchaser’s name, address and telephone number should
also be included.
If upon the Warrantor’s examination, the defect proves to be the result of defective mate-
rial or workmanship, the equipment will be repaired or replaced at the Warrantor’s option
without charge, and returned to the Purchaser at the Warrantor’s expense. (Contiguous
US and Canada only)
No refund of the purchase price will be granted to the Purchaser, unless the Warrantor is
unable to remedy the defect after having a reasonable number of opportunities to do so.
Warranty service shall be performed only by the Warrantor. Any attempt to remedy the
defect by anyone other than the Warrantor shall render this warranty void. There shall
be no warranty for defects or damages caused by faulty installation or hook-up, abuse or
misuse of the equipment including exposure to excessive heat, salt or fresh water spray, or
water immersion.
No other express warranty is hereby given and there are no warranties which extend
beyond those described herein. This warranty is expressly in lieu of any other expressed
or implied warranties, including any implied warranty of merchantability, tness for the
ordinary purposes for which such goods are used, or tness for a particular purpose, or
any other obligations on the part of the Warrantor or its employees and representatives.
There shall be no responsibility or liability whatsoever on the part of the Warrantor or
its employees and representatives for injury to any persons, or damage to person or
persons, or damage to property, or loss of income or prot, or any other consequential or
resulting damage which may be claimed to have been incurred through the use or sale of
the equipment, including any possible failure of malfunction of the equipment, or part
thereof. The Warrantor assumes no liability for incidental or consequential damages of
any kind.
Samlex America Inc. (the “Warrantor”)
www.samlexamerica.com
103 - 4268 Lozells Ave.
Burnaby, BC
Canada V5A 0C6
T: 604 525 3836
F: 604 525 5221
TF: 1 800 561 5885
[email protected]
www.samlexamerica.com/solar

32
INSTALLATION
Connecting two adjacent solar panels in parallel (Fig. 4)
To external
PV circuit
Female MC4
connector
Male MC4
connector SCW-20-2 Kit
Male
branch connector (+)
Female
branch connector (-)
Fig. 4. Connecting two adjacent solar panels in parallel
Two or more solar panels are connected in parallel to increase the current output at the same voltage.
Fig. 4 above shows the arrangement for connecting two solar panels in parallel using the SCW-20-2
Connecting Wire Kit (sold separately) and the Branch Connectors. This arrangement is possible if
the two solar panels will be mounted adjacent to each other.
The output wires of the two solar panels are connected in parallel using the Male and Female Branch
Connectors. The outputs of the Branch Connectors are then connected to the SCW-20-2 wires which connect
to the external PV circuit.
Connecting two solar panels in parallel when separated by a distance (Fig. 5)
To external
PV circuit
Female MC4
connector
Male MC4
connector SCW-20-2 KitSCW-20-2 Kit
Male
branch connector (+)
Female
branch connector (-)
Fig. 5. Connecting two solar panels in parallel that are separated by an extended distance
Fig. 5 above shows an arrangement for connecting two solar panels in parallel when they are separated by an
extended distance. In this case, the following will be required:
• SCW-20-2 Connecting Wires - 2 sets (sold separately)
• One Male Branch Connector and one Female Branch Connector
• One MC4 Male Connector and one MC4 Female Connector (sold separately) Model: MC4-2
Use one pair of the connecting wires and the MC4 male/female connectors to bridge the extended distance
between the panels. The Branch Connectors are then used to parallel the two solar panels. Use the second
pair of connecting wires to connect to the external PV circuit.
Connect the MC4 connectors to the bare ends of each of the Connecting Wires as follows:
1. Cut the two SWC-20-2 wires to the desired lengths depending upon the distance between the solar panels.
2. Strip 0.25” of the insulation at the ends.
3. Establish the correct polarity by tracing the wires back to the solar panel, if necessary.
4. Crimp the male and female contact inserts (2 and 5 of Fig. 1) to the bare ends of the wire with the
help of special purpose crimping tool meant for the MC4 connectors.
5. Install the contact inserts inside the housing of the MC4 connectors and tighten the strain relief / seal (7 of
Fig. 1) fully to ensure a watertight seal.
Branch Connectors (Fig. 2A and 2B)
Branch Connectors are used to connect two MC4 Connectors in parallel.
Each Branch Connector has 3 branches - two on the one side & one on the other. The branches could be
"male" or "female". The construction of the branches is similar to the construction of the MC4 connectors
shown in Fig. 1. In a branch connector, all the 3 branches are internally connected in parallel.
A Male Branch Connector (marked "+") is shown in Fig 2A. This consists of two MC4 Male Connectors that are
connected in parallel with a MC4 Female Connector (marked "+"). This is used to connect two MC4 Female
Connectors in parallel.
A Female Branch Connector (marked "-") is shown in Fig 2B. This consists of two MC4 Female Connectors that
are connected in parallel with a MC4 Male Connector (marked "-"). This is used to connect two MC4 Male
Connectors in parallel.
Fig. 2A. Male Branch Connector (marked "+") Fig. 2B. Female Branch Connector (marked "-")
Wire Connections on Solar Panels (See Fig. 3)
Most solar panels come with approximately 3 ft of Positive (‘+’) and Negative (‘-‘) wire. One end of each
wire is connected to the junction box of the panel. The other end of each wire is terminated with an MC4
connector (all Samlex Solar Panel wires are congured this way). The Positive (‘+’) wire has a Female MC4
Connector and the Negative (‘-‘) wire has a Male MC-4 Connector. To extend the length of these wires for
connection to a charge controller, combiner box or grid-connected inverter, the extension wire is required to
be terminated with corresponding Male and Female MC4 Connectors.
Solar Panel
MC4 Male Connector (Marked “-”)
MC4 Female Connector (Marked “+”)
Fig 3. Solar panel connecting wires with MC4 Connectors
Warning!
When the surface of the solar panel / array is exposed to sunlight, a DC voltage appears at the
output terminals turning it into a live voltage source. For example, a 24 V nominal solar panel
may put out an open circuit voltage of around 45 VDC that may produce electrical shock. Multiple
solar panels connected in series (to increase the output voltage) will put out higher lethal
voltages To avoid any electrical shock hazard during installation, make sure that the solar panel /
array is covered with an opaque (dark) material to block solar irradiation .