Hi Jeff,
I probably should mentioned that many of our float switch wire runs
exceed 3,000 feet from tank to Cu200.
We use shielded, direct burial rated 18/2 cable, bury the wire and
ground the drain wire at the controller.
So with those "long distance" systems, do you think a relay would work?
It just doesn't seem feasible to run
coil voltage that far. That's why we've been relying on the CU-200
microprocessor to do the job. Also, I
don't like to run anything but the pump off a PV direct system.
As for the pressure tank/ switch option, we do have a few of those out
there and I agree, they work fine.
But on some of our systems the vertical rise between the pump and
storage tank is over 300 feet. That's
about 130 psi and those pressure tanks wouldn't like that too much. And
for various design reasons, a check
valve on the main feed line isn't feasible, so we ruled out the pressure
switch option on these "long distance"
systems.
I also like to keep things as simple as possible where livestock water
is concerned. Farmers have so many
maintenance items on their list now, I hate to add more. So at first
look, the Cu200 seemed to be the ticket.
Thanks for the info!
Roy Butler
NABCEP Certified Solar PV Installer®
NYSERDA eligible PV& wind installer
PA Sunshine Program Approved PV Installer
Four Winds Renewable Energy, LLC
8902 Route 46
Arkport, NY 14807
607-324-9747
www.four-winds-energy.com
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On 4/22/2010 4:20 PM, Jeff Oldham wrote:
Hi Roy,
You do have a choice about controllers, as I mentioned I use off-the-shelf
components. For your need you have at least 2 sweet options - 1) get a relay to
switch the pump power and use a float switch to control the coil, go with a SSR
for even higher reliability. This is a $50 substitute for a $300 CU-200. 2)
Use a Cla-val at the tank and a pressure switch and 2gal press. tank at the
pump. This works at any distance w/o control wires and is fully hydraulic and
highly reliable plus this valve does not throttle as it reaches full. This is
my control of choice if the distance between pump and tank is much over 400',
cost must be considered as this is about a $700 setup.
-jeff o
> From the Solar, Wind and Hydro powered office of Jeff Oldham/Regenerative
SOLutions
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