3
D. Read the enclosed instructions for routing wires
through the knock-outs and clamps. (Figure 9)
E. Remove approximately ½” of insulation on the ends of
the wires and insert them under the appropriate
"POSITIVE" or "NEGATIVE" terminal screws in the
junction box. The wires should be installed with some
slack; excess wire should be cut off. (Figure 7 and 8)
Install cable with appropriate hardware in accordance
with NEC Article 250 or national and international rules.
F. Gently tighten the terminal screws. Do not
overtighten, as the terminal can be damaged.
G. The output wiring from the final module is generally
run to a separate array junction box. In commercial
system, this wiring from the array box to the next
component (i.e. fuse box. or charge regulator, etc.) is
generally run in conduit. The maximum electrical rating
of an acceptable series fuse is 4 ~ 12 amperes.
H. After completing the wiring between all boxes, Close
and secure all the junction boxes.
8. GROUNDING
We recommend you attach all module frames to an earth
ground. Attach a separate ground wire to one of the
extra mounting holes on the module frame with a self-
tapping screw. The racks must also be grounded unless
they are mechanically connected by nuts and bolts to the
grounded modules.
Grounding is achieved by securing the array frame for
both roof and field mounted applications. Additionally,
the array frame shall be installed in accordance with
NEC Art 250.
9. BLOCKING DIODES
Blocking diodes can prevent nighttime battery
discharging caused and prevent modules from loss of
array output and being damaged or destroyed by
reverse current flow.
KYOCERA modules do not contain a blocking diode
when shipped from the factory, however most battery
charging regulators do have this feature.
10. BYPASS DIODES
Partial shading of an individual module in a 12 volt or
higher "series" string (i.e. two or more modules) can
cause a reverse voltage across the shaded module.
Current is then forced through the shaded area by the
other modules in series.
By having a bypass diode, the forced current will bypass
the shaded module in a series circuit, thereby minimizing
module heating and array current losses.
For 12-volt systems and higher: Each solar module
junction box has a diagram illustrating the proper
direction for the by- pass diode to be installed between
two of the terminal screws (Figure 11, Figure 12). When
the solar modules are connected as individual series
strings first, and then these strings are connected in
parallel, bypass diodes should be used in each junction
box. This is the simplest wiring arrangement for most
installations.
At a minimum the bypass diodes must have the following
electrical characteristics:
•
Rated Average Forward Current [I
)$Y
] Above
maximum system current at highest operating
temperature.
•
Rated Repetitive Peak Reverse Voltage [V
UUP
]
Above maximum system voltage at lowest
operating temperature.
11. MAINTENANCE
Solar modules require very little maintenance. It is not
un- common for a remote site to be checked but once
per year. Under most conditions, normal rainfall is
sufficient to keep the module glass clean. If dirt build-up
becomes excessive, clean the glass with a soft cloth
using mild detergent and water. Modules that are
mounted, flat (O
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often, as they will not "self clean" as effectively as
modules mounted at a 15
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