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4.3 Solar Arr ay Wir ing
WARNING: Your photovoltaic array generates hazardous voltages. A 48 Volt (nominal) array can
generate nearly 100 volts when disconnected from load. A short circuit or loose connection will
produce an arc that can cause serious burns. All wiring must be done by qualified personnel, in
compliance with local, state, and national electrical codes.
The solar array can produce hazardous voltage even under low light exposure. To prevent shock hazard
while wiring the array, leave one or more wires disconnected or cover it with opaque fabric.
SunCentric P
solar-direct (non-battery) systems use a variety of array configurations. Some use 12V
(nominal) modules, and some use 24V modules. Modules are connected in series for 36 or 48V, and
sometimes also in parallel to increase the current. Refer to the System Wiring Diagram for your system,
attached at the end of this manual. Be sure the modules (panels) match the description on your System
Wiring Diagram.
Solar module connections
The terminals in the module junction boxes can be confusing. Refer to the
module manufacturer’s instructions that are packed with the modules. Make strong connections that will
hold for many years. Most array failures are caused by loose,
corroded, or shorted connections.
PHOTOS
show two types of PV module junction systems.
TOP
Quick-connect system using “MC” connectors.
BOTTOM
Conventional junction box with conduit holes.
Type of wire
Use either electrical conduit or outdoor UV-
resistant wire. The solar array has a life expectancy beyond
twenty years. Don’t degrade it with inferior materials! Use
minimum wire size #12 (4 sq. mm) for the connections between
modules and for short distances to the controller. Some
appropriate types of wire are: USE, UF, SE and SOOW.
Solar tracker wiring
If you are installing a solar tracker, pay
careful attention to the wire section that leads from the moving
rack down to the stationary mounting pipe. Use materials that
are highly flexible. Form a drip loop to shed water and to
minimize stress. Secure the assembly mechanically at each
end so the insulation and the connections are not stressed by
the tracker’s motion. Swing the tracker fully in each direction,
at various seasonal tilt angles, to verify that the cable does not
rub or restrict the tracking motion. See tracker photo.
MC connectors
Some PV modules have these quick
connectors. If the connector is not appropriate at some
junctions, you can cut the wire and make a conventional
connection.
CAUTION Loose connections are the most common cause of system failures.
Pull on each connection to confirm that it is secure.
Содержание SunCentric P
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