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4.12 AC Backup
Some solar pumps may not provide sufficient flow during all conditions, especially in unusually cloudy
weather or if sufficient storage is not provided. In a swimming pool system, backup power may be
necessary for some types of pool sweepers or automatic pool cleaners (see Section 5.2).
There are two ways to supply backup pumping. One is to install a second pump, powered by a different
energy source, and the other is to use a power converter to convert AC power from a conventional
source to the DC power required by the
SunCentric P
.
Installing a backup pump
The
SunCentric P
pump can be installed parallel to a conventional AC
pump or engine-powered pump. This is especially reasonable to do in a retrofit, where there is already a
conventional pump installed. To install two pumps in parallel, connect the pump intakes together using a
Y or a sweeping T fitting. Install a check valve at each pump's outlet, to prevent one pump from
bypassing the other. Finally, connect the check valve outlets together, again with a Y or sweeping T
fitting. Either pump can be turned on, with no need to turn any valves.
AC-DC power converter – “
AC Power Pack
” (Dankoff Solar Item #11930). This product allows the use
of 115 or 230VAC power to run
SunCentric P
for emergency or supplemental backup. Utility power or a
portable generator can be used, and interfaced automatically with solar. The flow rate will equal that
shown on the specifications for a system using a 600 watt solar array. If your solar array is of lesser
power rating, the pump will run faster with the
AC Power Pack
than it does under full-sun solar power.
See
AC Power Pack
specifications and instructions attached at the end of this manual.
If you anticipate installation of the
AC Power Pack
in the future, leave space for it near the pump.
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