Sun Pumps SCP 48-18-48Y BC - Manual (Page 6)

Before installing any pump system read all product manuals then review all system components to become
familiar with the physical and electrical layout. Check all equipment for any product damage. Refer to
applicable figure(s) as a guide during the installation. Controller door must be closed during normal operation.
Warning
Reverse polarity on a panel system capable of producing over 20 amps will result in non-
warranted product damage. Please check polarity before connecting power to the controller.
These controllers are for SunPumps Sensorless Brushless DC Motors only. Do NOT use this
controller on Brush-Type motors, Sensor Type Brushless DC motors or on any AC motor.
Damage to the controller will result.
3.1 System Location
As the majority of system installations vary greatly, only general comments can be made as to location. Prior to
installing the system, it is suggested to make a system layout plan. During the system layout, take into
consideration any potential shading of the solar electric modules, wire runs, wire size, conduit runs, trenching,
controller accessibility, tank location, pump head etc. Shading even a small portion of the array can reduce the
output of the entire array and thus reduce or completely stop the output of the pump. There is no substitute for a
good plan!
For locating the pump, damp, non-ventilated locations should be avoided. Motors and controllers require free
circulation of air to aid in cooling.
The PCA and PCC-series controllers can either be mounted indoors or outdoors. Locate all system equipment as
close as possible to each other. The controller must be mounted in a vertical position for proper cooling and to
keep the electronics dry. The controller should be located close to the pump if possible. This general physical
layout is conducive to clean installation both aesthetically and electrically.
3.2 System Design Basics (Read carefully before installation)
1. The pump discharge piping should be sized for efficient pump operation. Pipe size being too small will create
greater friction losses which require more power to operate and thus a higher solar module cost.
2. Make sure the pool filter is size correctly for the flow rate of the pump. A filter sized too small will create higher
friction losses and will increase the power requirements and thus the cost of the system.
3.
For optimum pump performance make sure that the wire is sized properly for the length of run between the pump
and the solar modules as specified by the National Electric Code. Wire sized too small will cause a decreased
output from the pump. Keep the distance from the solar modules to the pump as short as possible. Refer to a DC
wire loss chart for proper sizing. It is recommended to keep the voltage drop under 3%. Refer to the wire sizing
guide on the SunPumps web site under Engineering. Always use liquid-tight flexible metallic conduit and liquid-
tight fittings between the controller and the pump motor.
4. Never install the controller in direct sunlight. Direct sunlight on the controller may cause over-heating of the
controller.
5. Never lay the controller on the ground or mount the controller in a horizontal position. The controller should be
mounted in a vertical position only. The controller should be mounted as close to the pump as possible.
6. The controller should be grounded to the pump motor housing, the frame of the solar modules and to an 8-foot
ground rod. Use only a copper lug to attach the ground rod. Always use a DC surge/lightning arrestor on the panel
side of the controller. (Midnight Solar MN-SPD surge arrestor is recommended)
7. Do not ground the PV array positive or negative electrical wires.