5
-
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Parallel connection for more current
Electrical Installation
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 the same.
• When connecting plural strings of modules in
parallel every series string or solar module must be
fused prior to combining with other strings.
• Abide with all applicable federal, state, 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 : 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 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. The requirements of
the National Electrical Code (NEC) in Article 690
shall be followed to address these increased
outputs. In installations not under the requirements
of the NEC, the values of Isc and Voc marked on
this PV module should be multiplied by a 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.
• The junction box should not be opened. Opening
the junction box will 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
• Shock hazard may occur near the solar modules
electrical connections.
• Modules may be connected in series and/or
parallel to achieve the desired electrical output as
long as it is within the guidelines on the product
specification sheet.
• Please use only the same type of modules in a
combined source circuit.
• Do not disconnect the module under when it is
operating.
Shock hazard may occur near the solar modules
connection means.
Diodes
• All LG modules are equipped with factory installed
bypass diodes. The factory-installed diodes provide
proper circuit protection for the systems within the
specified system voltage.
Series connection for more voltage
+
-
1
D1
D2
D3
2
3
4
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 the same.
• The maximum number of series connected
modules can be determined by basis on max
system voltage, the 125% safety factor not
explained in specifications, and the module Voc
which can be checked in Product Specifications in
this document.
Do not exceed 80%
of maximum system voltage.
• Maximum Module configuration (recommend) :
refer to the ‘Product Specification’ in this manual.
Diode specification and configuration
[HUBER&SUHNER]
[JMTHY]
I
F
(AV)
V
F
(max)
V
RRM
T
j
(max)
R
TH
2X7.5A
0.84V
45V
175°C
1.7°C/W
I
F
(AV)
V
F
(max)
V
RRM
T
j
(max)
R
TH
25A
0.6V
50V
200°C
2.0°C/W