pool pump and sunnyboy/sw4048 hybrid [RE-wrenches]

[Paul Benson, Dankoff Solar]

As all you wrenches know, point of use investment in efficiency is often the
most appropriate way to reduce long term costs; the compact florescent bulb
is the most accessible example.  From this perspective, it makes sense to
invest initially in the most efficient pump to replace the existing AC pump,
as well as review the pool equipment to make sure it allows for the most
efficient pump.  For example, reducing friction loss (head loss) through the
filtration, maximizing pipe sizes, etc. will reduce the power requirement.

  Turning over the volume of the pool in two days instead of every day also
greatly reduces power consumption (and head loss).  When these measures have
been taken, it can make sense to replace the AC pump entirely with a PV
driven pump.  Dankoff Solar Products now manufactures a PV direct pool pump
which integrates the basket strainer in a conventional plastic pump head,
which is coupled to a custom made high efficiency DC motor, which can run
without a controller PV direct.  These systems can use as little as 230
watts.  The AC pump can be left in parallel with the solar pump to cover
periods of heavy pool use, or the DC pump can be configured with a power
converter to run the pump off AC power when needed.  For California users,
the system can be rebated by the CEC.

These pool pump systems can also be used in large pools to take over a
portion of the pumping load, such as pumping through a solar collector loop
for pool heating, leaving the AC pump to handle filtration for fewer hours
per day.

Paul Benson
Dankoff Solar Products

on 11/25/02 6:33 PM, keith at kcronin at lava.net wrote:

> Hello Wrenches
> 
> Two questions:
> 
> 1. I am looking to create an energy star home.  I have complied with
> every energy consuming appliance we have from the refrigerator, washer,
> dryer, solar hot water.  The last item is the pool pump.  It is a 1 hp
> filter/circulation pump and it came with the house when we bought it
> last month.  I have spoken to a few pool dudes and they seem to all push
> the 8 hour a day running concept.  That’s 8 kW a day I am not
> enthusiastic about.  I recently whittled the time down to 7 hours to see
> if the algae liked this new additional hour for growth and haven’t seen
> any appreciable difference. I get the feeling that if you’re a pool guy,
> you have a route and want to get in and out as quickly as possible:
> i.e.: run the pump longer. Anyway, does anyone have any guidelines for
> hours of operation in relationship to pump size, pool size, and distance
> to the pool from the pump etc. and can anyone recommend perhaps a super
> efficient ¾ or ½ hp pump?
> 
> 2. Since our move, I took my 4048, SP75s, C-40, DC175, Concorde AGM’s
> with me.  I will have a stand alone system and a newly installed (this
> weekend) 12- bp160’s on a
> SB2500.  I was considering using the outback combiner box and rewire the
> panels with three (3) homeruns into a 48 volt configuration.  I was
> going to purchase a 120/240 transformer and have an AB switch.  This
> way, I can proverbially have the best of both worlds.  One system is
> grid tied for max efficiency, the other for keeping the refrigeration
> cold.  In the event of an extended power outage, divert the sunny boy
> string to the input of the 4048 and have a slick backup system and keep
> those batteries topped off.  I understand everyone must be thinking why
> bother, but my 4048 is only 3.5 years old.
> 
> Any suggestions or comments would sincerely be appreciated.
> 
> Keith Cronin
> Island Energy Solutions
> 318 A Kuulei Road
> Kailua, Hawaii 96734
> 808-262-3268 Tel
> 808-263-0338 Fax
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
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