The constant pressure pump types often do not need a big expansion tank. I did a test on Grundfos and counted cycles with the small pressure tank and the large. The large tank cut cycles by 1/3. They really are not cycles like a pressure switch system because of variable speeds.
I have even used a pressure switch on a constant pressure variable speed pump to reduce cycles at night for an offgrid restaurant. It does work. Big tanks save big bucks. If you have one, use it! Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ e-mail offgridso...@sti.net text 209 813 0060 On Wed, 23 Sep 2020 10:00:04 -0600, Dana Orzel <d...@solarwork.com> wrote: > It was an installed price with pump set at 100' - 3 years ago. I had the > wire.... > > > > Dana Orzel Great Solar Works, Inc. > C - 208.721.7003 d...@solarwork.com > Idaho Contractor - # 028765 Idaho PV # 028374 > NABCEP # 051112-136 www.solarwork.com > "Responsible Technologies for Responsible People since 1988" > Please consider the environment before printing this email. > > > -----Original Message----- > From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> On Behalf Of > Jay > Sent: Wednesday, September 23, 2020 9:25 AM > To: RE-wrenches <re-wrenches@lists.re-wrenches.org> > Subject: Re: [RE-wrenches] Pentair Pump power > > Hi Dana > > What did it cost? Just the parts. > > Thx > Jay > >> On Sep 23, 2020, at 8:31 AM, Dana Orzel <d...@solarwork.com> wrote: >> >> 3 years in service now & no service required or needed. I installed a >> large -120 gallon well expansion tank as usual [Typ off grid thinking -- >> reduce the # of start surge] & found out it was not necessary. The start >> up is so tapered smooth that I could have used a 40 gal tank, when I spec >> another OG system I will not use an oversized storage tank. Ghost load on >> the controller [super smart, digital & always awake] is very slight. The >> controller uses a transducer not a pressure switch measures PSI in tenths >> of a PSI. I have not tried to measure the controller load asleep, as it >> is hard wired in. >> >> >> >> Dana Orzel Great Solar Works, Inc. >> C - 208.721.7003 d...@solarwork.com >> Idaho Contractor - # 028765 Idaho PV # 028374 >> NABCEP # 051112-136 www.solarwork.com >> "Responsible Technologies for Responsible People since 1988" >> Please consider the environment before printing this email. >> >> >> -----Original Message----- >> From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> On >> Behalf Of frenergy >> Sent: Tuesday, September 22, 2020 7:18 PM >> To: re-wrenches@lists.re-wrenches.org >> Subject: Re: [RE-wrenches] Pentair Pump power >> >> Just curious, the 120VAC 1/2 HP submersible that has to date been in the >> well for the last 17 years has needed zero service, is there something >> about the Pentair set-up you're referring to that needs regular or >> occasional service? Believe me I understand your comment about >> schlepping service to some other poor soul, but.... >> >> Is the Pentair powered with 240 Vac inverter power? >> >> Bill >> >>> On 9/22/2020 2:58 PM, Dana Orzel wrote: >>> If you have 240 VAC look at the Pentair wild AC pumps I have one at 20 >>> GPM and am a believer. Tapers on - soft start, varies the volts & >>> amperage with flow and tapers the amperage down as it reaches a full >>> expansion tank. >>> >>> Even better my local well pump installer sells & services it so I do >>> not have to! Getting a little smarter as I get older. >>> >>> >>> >>> Dana Orzel Great Solar Works, Inc. >>> C - 208.721.7003 d...@solarwork.com >>> Idaho Contractor - # 028765 Idaho PV # 028374 >>> NABCEP # 051112-136 www.solarwork.com >>> "Responsible Technologies for Responsible People since 1988" >>> Please consider the environment before printing this email. >>> >>> >>> -----Original Message----- >>> From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> On >>> Behalf Of frenergy >>> Sent: Tuesday, September 22, 2020 1:12 PM >>> To: re-wrenches@lists.re-wrenches.org >>> Subject: [RE-wrenches] Pump power >>> >>> Wrenchers, >>> >>> We're upgrading an off-grid water system. Dynamic head >>> while pumping at 20 GPM is 150 ft from water level to wellhead and >>> then its 85 ft vertical to storage tank so 235 ft total head to open >>> discharge. We would like to get most of that 20 GPM, we need to know >>> if there is personal experience with starting a 1.5 or 2 HP, 240 vac, >>> 2 wire submersible pump against that kind of head with an Outback >>> Flex >>> Power2 (2 X VFXR3648A-01 inverters). >>> >>> The FP2 will also be powering standard off-grid loads. >>> There is plenty of battery behind the inverters. If a >>> soft-start solution is required, some specifics would be >>> great. Grundfos doesn't seem to have an option for these >>> requirements, solar-direct is not an option at this >>> location. >>> >>> Thanks, >>> >>> Bill >>> >>> Feather River Solar Electric >>> Bill Battagin, Owner >>> 4291 Nelson St. >>> Taylorsville, CA 95983 >>> 530.284.7849 >>> CA Lic 874049 >>> www.frenergy.net >>> >>> >>> -- >>> This email has been checked for viruses by Avast antivirus software. >>> https://www.avast.com/antivirus >>> >>> >>> _______________________________________________ >>> 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://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> www.members.re-wrenches.org >>> >>> >>> _______________________________________________ >>> 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://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> www.members.re-wrenches.org >>> >> -- >> Feather River Solar Electric >> Bill Battagin, Owner >> 4291 Nelson St. >> Taylorsville, CA 95983 >> 530.284.7849 >> CA Lic 874049 >> www.frenergy.net >> >> >> -- >> This email has been checked for viruses by Avast antivirus software. >> https://www.avast.com/antivirus >> >> >> _______________________________________________ >> 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://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> >> _______________________________________________ >> 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://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> > _______________________________________________ > 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://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > _______________________________________________ > 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://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org _______________________________________________ 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://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
