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4 ELECTRICAL INSTALLATION
4.1 Controller, Junction Box, and Conduit
WARNING To be installed, connected and serviced by qualified personnel only. Ensure all power
sources are disconnected when making connections to the controller. Follow all appropriate
electrical codes. There are no user serviceable parts inside the motor or the controller.
System Wiring Diagram
If your pump was purchased as part of a pre-packaged system, a System
Wiring Diagram should be attached at the back of this manual.
Location
If the solar array is to be located more than about 100 feet (30m) from the pump, place the
controller close to the solar array, not the pump. This will reduce the risk of lightning damage.
Explanation — The controller’s input circuitry is more sensitive to surges than its output. It is safest to
minimize the length of the input wiring.
Protection from solar heat
Electronic devices are most reliable when they are protected from heat.
The ideal location is in the pump room. If there isn’t a pump room with adequate space, mount the
controller in the shade of the mid-day sun. If the controller is to be mounted at the solar array, an ideal
location is directly under the array, on the north side of the mounting pole. If shade is not available, cut a
piece of sheet metal and bolt it behind the top of the controller. Bend it over the controller to provide
shade. This is especially important in extremely hot locations.
Location of controller
For outdoor installation, mount the controller vertically to shed rainwater. It is
preferable to mount it ON THE NORTH SIDE of a pole or other structure, to help reduce solar heating.
This may also allow easiest access without hitting your head on the lower (south) edge of the array.
Junction box
A pre-wired junction box is included with your system. The junction box terminals will
handle pump wires as large as #6 (13 sq. mm). If large wires cannot be accommodated easily in the box,
you can join them to smaller wires in the junction box. #12 (4 sq. mm) or larger is acceptable for this very
short length. Do NOT remove terminal screws. If the key to the junction box gets lost, it can be opened
with a screwdriver.
ON/OFF switch
If the controller and junction box is not to be installed near the pump, and an ON/OFF
switch is required near the pump, or if a timer, float switch, or any other external on/off control is
required, refer to Section 4.10, External ON/OFF Switching.
Mounting the controller and junction box to a pole
See photos on the following page.
The controller
can be mounted onto the solar array support pole using materials available from your local electric
supply store. The best mounting hardware is “slotted strut” (
Unistrut
® or equivalent). This makes a
strong assembly that is easy to adjust. In USA, these materials are commonly available from electric
suppliers.
Other methods of mounting to a pole:
1. Make “U-bolts” from threaded steel rod. You may need to drill additional holes in the junction box.
Seal unused holes with a permanent sealant.
2. Attach a metal plate to the pole and bolt the boxes to the plate.
3. Drill and tap holes in the pole, drill matching bolt holes (centered) in the boxes.
Electrical conduit is recommended
Electrical conduit (pipe) protects outdoor wiring from the
weather, from human activities, and from chewing animals. If you don’t use conduit, use strong, high-
quality outdoor cable. Where cables enter the junction box, install sealed strain-relief cable clamps.
Содержание SunCentric P
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