SQFlex Setup and Sizing
SQFlex Battery Backup Systems
Battery backup systems can be used with an SQFlex pumping system. These systems are typically used in
applications where the pump will not be running during most of the peak sun hours of the day, or where it is
impossible or imprictical to store large volumes of water. Examples include remote homes or cabins, automatic
livestock waterers, and very low-yielding wells.
System Set-up
The system will be wired as shown in the accompanying diagram.
• Power will be provided by the calculated number of solar panels wired to produce 48 VDC (nominal)
• Power from the solar panels will feed into a 48 VDC charge controller, which will regulate the current
fed to the batteries
• From the charge controller, power passes into the battery bank, which consists of the number of
appropriately sized batteries, wired in series to achieve 48 VDC (nominal) output
• Power is drawn from the battery bank and routed through an SQFlex control box (IO 100/101, or CU 200)
• Power is run from the control box to the SQFlex pump
For domestic water supply applications
The CU200 pump control box should be selected, since it includes terminals for a pressure switch, which will
control the pump’s on/off operation via the pressure in the storage tank. The pressure switch should be of a
normally-open configuration, where the contacts within the switch are in the open position when the pressure
is below the maximum set-point. When the pressure in the system rises to the maximum desired pressure, the
contacts will close, signaling the pump to shut off.
Performance range: Flow up to 20 gpm
Head up to 139 ft
System pressure:
Up to 109 psi
Inlet pressure:
Max. 45 psi
Suction lift:
Max. 26 ft
Liquid temperature:
32°F to +95°F
Ambient temperature:
32°F to +113°F
Nominal voltage range:
1 x 110 - 120 V or
1 x 220 - 240 V
Weight: 29 pounds
Dimensions: 12.6 x 22.4 x 8.7 (in)
Thermal protection
Yes
Battery Backup System Diagram