5
Electrical Installation
Caution
• Avoid all electrical hazards when installing, wiring,
operating and maintaining a panel.
• Do not use panels of different electrical or
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physical configurations in the same system.
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• Match the polarities of cables and terminals when
making the connections; failure to do so may
result in damage to the panel.
• When reverse currents can exceed the value
marked on the name plate, a properly rated and
certified over-current device (fuse or circuit
breaker) must be connected in series with each
panel or string of panels.
• The rating of the over-current device shall not
exceed the maximum series fuse rating marked
on the name plate.
• The panel contains factory installed bypass
diodes located inside the junction box.
• When installing the system, it is recommended to
install the lightning rod to protect the system.
• The junction box should not be opened. Opening
the junction box may void the warranty.
• Panels with a suspected electrical problem
should be returned to LG Electronics for
inspection and possible repair or replacement as
per the warranty conditions provided by LG
Electronics.
Electrical Connections
• Modules may be connected in series and/or
parallel to achieve the desired electrical output as
long as certain requirements are met.
• Please use only the same type of modules in a
combined source circuit.
• Do not disconnect the module under load.
Shock hazard can occur near the solar modules
connection means.
Series Connection
• The solar modules may be wired in series to
produce the desired voltage output.
• The current of each module connected in series
should be same.
• The maximum number of series connected
modules can be determined by basis on max.
system voltage, the 125% safety factor, and the
module Voc which can be checked in “Product
Specifications” in this document.
Series connection for more voltage
Parallel Connection
• The solar modules may be combined in parallel
to produce the desired current output.
• When modules are combined in parallel, the total
current is equal to the sum of currents from each
module.
• The voltage of each module connected in parallel
should be same.
• When connecting plural strings of modules in
parallel every series string or solar module must
be fused prior to combining with other strings.
By pass diodes are factory installed in the solar
modules.
• Please refer to the applicable regional and local
codes for additional fusing requirements and
limitations on the maximum number of solar
modules in parallel.
• Maximum parallel strings without proper
measures, e.g. fuse 20A and/or blocking diode :
1 string
Parallel configuration is not limited if proper
measures are taken to block the reverse current
flow, e.g. fuses for the protection of the module
and cables from over-current and/or blocking
diodes for prevention of unbalanced string
voltage.
• A multiplying factor is required for increased
output of the PV modules. Under normal
conditions, a PV module is likely to experience
conditions that produce more current and/or
voltage than reported at standard test conditions.
Accordingly, the values of Isc and Voc marked on
this PV module should be multiplied by a factor of
125% when determining component voltage
ratings, conductor ampacities, fuse sizes, and
size of controls to the PV output.
• Depending on national directives additional
safety factors might be applicable for overcurrent
protection.
•
Do not exceed 80%
of maximum system voltage.
• The maximum solar module configuration can be
found in “Product Specifications”.
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Parallel connection for more current
