Solar Energy
6.
Electrical Installation
Module To Module Interconnection
Bosch Solar modules have been designed to be
easily interconnected. Each module comes with
one positive (+) wire with a plug on one end
and one negative (-) wire with a receptacle on
one end. Both wires are connected inside of
the junction box (diode housing). Modules are
interconnected by inserting the plug from one
module into the receptacle of the next module
in the array string. Secure the mated connector
pair to the inside flange of the module frame to
protect it from damage.
Building Source Circuit and Configuring
Modules
PV arrays are comprised of source circuits. A
source circuit is a series of modules connected
together to reach the desired power. The num-
ber of modules in a source circuit can vary de-
pending on the module voltage and desired
system voltage, provided the max system volt-
age does not exceed that allowed by NEC Sec-
tion 690-7 (600 volts).
When calculating the system operational volt-
ages use the module V
p
. However, for NEC
compliance, the maximum system voltage is
calculated using Voc.
When determining component voltage ratings,
conductor ampacities, fuse sizes, and size of
controls connected to PV output, use the values
of Isc and Voc marked on the module or found
in this instruction manual.
NOTE:
Under normal conditions, a photovoltaic module
is likely to experience conditions that produce
more current and/or voltage than reported at
standard test conditions. Accordingly, the val-
ues of Isc and Voc marked on this module must
be multiplied by a factor of 1.25 when determin-
ing component voltage ratings, conductor am-
pacities, fuse sizes, and size of controls con-
nected to PV output.
Refer to Section 690-8 of the National Electrical
Code for an additional multiplying factor of 125
percent (80 percent derating) which may be
applicable.
CAUTION
DO NOT connect or disconnect a Bosch Solar
module unless the array string is open-circuited
or all of the modules in the string are covered.
The connectors are not designed to make or
break the full system current.
CAUTION
Be aware that the artificially concentration
sunlight shall not be directed on the modules or
panels.
Module Grounding
The module frame must be properly grounded.
The installer shall ground the frame using the
grounding method described in NEC Article 250.
All USL/CNL installations shall be in accordance
with CSA C22.1, Safety Standard for Electrical
Installations, Canadian Electrical Code, Part 1.
The grounding wire must be properly fastened
to the module using a ground bonding lug. Use
only UL Listed grounding lugs suitable for out-
door use: Burndy P/N CL-50-DB or ILSCO P/N
GBL-4DB in conjunction with an 8-32 stainless
steel fastener and star washer. An uncoated
copper lug is not acceptable for attachment to
the aluminium frame.
Four grounding holes are provided on the inside
of the module frame located in the middle of
each of the four frame flanges. See Figure 3 for
location of module grounding holes.
See Figure 4 for installation of lug.
Note:
The star washers are required for making a
reliable electrical earth connection with the
anodized aluminium frame as well as to prevent
loosening of the screw over time.
To attach grounding lugs, use #8-32 (4mm)
bolts and nuts, star washers, and lock washers
that are provided for use with module ground
points. The ground lug shall be installed from
the bottom side of the frame using the paint
cutting star washers, lock washer and bolt.
Torque hex bolt to 50-70 in-lbs. This ground
hardware can accommodate a 14AWG through
4AWG bare (stranded or solid) wire.
8/9
photovoltaikforum.com
