Kris,
I see that apparently to date no Wrench has responded to your question,
so I'll give it a wild-ass go. Although I've never used or even seen a
72V controller, I'll suspect from your description that it was made by
Dan Pringle of Solar Converters, now long gone.
But based on the limited information you have provided, I don't
understand your question. A DC pump is not normally regulated by
voltage, but by either a pressure switch, if it's a single-pump
pressurized system, or by a float switch in a dual-pump system with a
storage cistern. Cut-in and cut-out voltages would be set only to
protect the batteries from overvoltage and excessive discharge, and
these settings would be independent of what was being operated, in this
case the pump. Given this, if the DC relay (with a 12V coil to work with
the Midnite aux port) is there to set these battery protective limits, I
would suggest that you determine the conventional LBCO and HBCO voltages
for a 12V battery and multiply by 6 for 72V. Most likely at 72V, the
current would be quite low unless it's a huge pump, and DC pumps in
general have little surge, so a fairly low LBCO would be more acceptable
than with a lower voltage system, all other issues equal (which, of
course, they never are...).
Allan
On 7/2/2020 7:02 PM, Kristopher Schmid wrote:
Greetings All,
I have inherited a stand alone system at a state park originally
installed by Currin Corporation out of Michigan (I think that he did
work in a number of state parks in the region). Good install, but the
custom designed 72 volt controller (a Canadian company that slips my
mind at the moment) crapped out. I replaced it with a 72 volt midnite
controller and all is well except...
The original system used a dc relay to disconnect the 72 volt dc
submersible well pump. I kept the relay in the circuit controlled by
the midnite aux port. Since I was unable to read any programming from
the old controller, I am not sure where to set the cut-in and cut-out
voltages for the pump relay.
Battery bank: 12 Deka MK 8G27 (72 volts, 176 ah)
Pump current: unknown at the moment
Anyone?
Thanks,
Kris
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*Allan Sindelar*
[email protected] <mailto:[email protected]>
NABCEP Certified PV Installation Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*
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