10
WIRING
GENERAL
All wiring should be done in accord-
ance with applicable electrical codes.
All wiring should be done by a quali-
fied, licensed professional.
Wiring should be protected to help
ensure personal safety and to pre-
vent its damage.
Please connect each cable after con-
firming the polarity of it is correct.
Connectors between modules must
be inserted until they click.
When connecting the connectors,
please make sure that foreign mat-
ter such as water, sand and so on do
not get inside the connector. Also,
please keep in mind that if you leave
the connector in a non-connected
state for a long period of time, con-
tamination of foreign matter is likely
to occur.
If an extreme load is applied to the
cable, the cables may come off the
junction box body or the connect-
ors. Please connect so that a strong
load is not applied to the cable.
When fixing the cable to the stand,
make sure the minimum bending
radius of the cable is 30 mm or
more.
Do not disconnect terminals while
modules generate electricity and
connect electrical load to avoid the
hazard of electrical shock.
Cable conduits should be used in
locations where the wiring is inacces-
sible to children or small animals.
These modules contain factory in-
stalled bypass diodes. If these mod-
ules are connected each other incor-
rectly, the bypass diodes, cables, or
junction box may be damaged.
Please contact your Panasonic Au-
thorized Representative with ques-
tions regarding other electrical con-
nections if needed.
MODULE WIRING
All modules connected in series should be
of the same model number and/or type.
The number of VBHNxxxSJ25 mod-
ules can be wired in series is recom-
mended to be sixteen (16) or fewer.
If connecting seventeen (17) mod-
ules and more in series, check local
temperature conditions to ensure
compliance with maximum system
voltage limitations.
The number of VBHNxxxSJ47 mod-
ules can be wired in series is recom-
mended to be twelve (12) or fewer.
If connecting thirteen (13) modules
and more in series, check local tem-
perature conditions to ensure com-
pliance with maximum system volt-
age limitations.
Do not connect module in parallel
without using connection devices
that connect to appropriate FUSE
for each series string or each mod-
ule. For the installation of connec-
tion devices, refer to the installation
manual of connection devices.
Do not connect modules in parallel
without maximum over current pro-
tection.
ARRAY WIRING
The term “array” is used to describe
the assembly of several modules on
a support structure with associated
wiring.
When installing a PV array, the sys-
tem design must be completed with
reference to the module electrical
specifications for proper selection of
inverters, fuses, breakers, charging
controllers, batteries and other stor-
age devices. In particular, as the
temperature characteristic of the PV
module, the voltage value rises on
the low temperature side. Consider
the lowest temperature in the area
where the system is installed and
select the equipment so that it does
not exceed the rated voltage of the
equipment.
Modules are equipped with SMK
connectors (P51-5H/R51-5) as a ter-
minal enclosure. Use these SMK
connectors for electrical connec-
tions.
Use copper wire which is insulated
to withstand the maximum possible
system open circuit voltage. For
applications where wire conduits are
used, follow the applicable codes for
outdoor installation of wires in con-
duits. Minimum diameter of wire
conduit is 4 mm
2
. The temperature
rating of conductor is –40
～
90
℃.
In order to avoid submerging cables
and connectors in the water, cables
must be fixed either to the module
frame using cable fixing holes or to
the mounting structure. Also, if the
cable is not secured, a force may be
applied to the cable from the out-
side, and the module may be dam-
aged.
Do not insert PV cable between back
side and mounting structure rail.
When snow weight is applied to the
module, load may be applied to the
cable.
Verify that all fittings are properly
installed to protect cables against
damage and prevent moisture intru-
sion.
EARTH GROUND WIRING
Use the grounding wire (green)
which is 5.5 mm2 or more to ensure
that all modules are grounded by
the method shown in the figure 6.
When grounding the module, please
use a ground hole on the frame. For
metal parts for grounding, consider
combination that does not cause
corrosion due to dissimilar metal
contact.
We recommend installing a light-
ning rod and SPD (Surge protection
device) to reduce damage or break-
down to the PV module caused by
lightning.
Check your local codes for require-
ments.
Star washer (stainless steel)
Ground wire (5.5mm
2
, green)
Round crimping terminal
Figure 6. Grounding method
M4×16 bolt
Flat washer (stainless steel)
M4 nut (stainless steel)
Ground hole
Flat washer (stainless steel)
Spring washer (stainless steel)
