Hi Allan and Kris, Is it possible the pump was programmed to pump when the batteries were pretty full, or at least not low? IE don’t pump at night.
If so then on a 72v System which is 3 X 24v, say a low start voltage of around 78v. It would be 26v on 24v system. Not sure if this helps or not Jay Peltz power. > On Jul 7, 2020, at 3:20 PM, Sindelar Solar <al...@sindelarsolar.com> wrote: > > > 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 >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> www.members.re-wrenches.org >> > -- > Allan Sindelar > al...@sindelarsolar.com > NABCEP Certified PV Installation Professional > New Mexico EE98J Journeyman Electrician > Founder (Retired), Positive Energy, Inc. > 505 780-2738 cell > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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