Wrenches:
I found some on-line pump HP calculators, such as this <https://engineeringunits.com/pump-power-calculator/> one. Plugging in 1 gpm of water pumped to 300 feet elevation results in 0.1 HP, not 5. I have no idea how Daryl arrived at 5 HP. Plugging in the 10 gpm we want, the HP required is a little over 1. I tried several calculators and worked the formula myself and all approaches resulted in the same answer. William Miller Solar 17395 Oak Road, Atascadero, CA 93422 805-438-5600 www.millersolar.com CA Lic. 773985 *From:* Wesley Kennedy [mailto:hathaso...@yahoo.com] *Sent:* Monday, March 28, 2022 9:58 AM *To:* RE-wrenches *Cc:* William Miller; Darryl Thayer *Subject:* Re: [RE-wrenches] Water Pumping 24/7 Hi Darryl, I’d love to see that math on that.you mind sharing? -Wes 303-653-3073 On Mar 27, 2022, at 1:27 PM, Darryl Thayer via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: Hello, Sorry to be so late but I have been overloaded. Just a note on physics of lifting water. The calculation indicates if you pump 1 gallon per minute up 300 feet it required a water hp of 5 HP Use this base number and good pumps are about 70% efficient. If the flow rate is not 1 GPM adjust the HP accordingly. For example, if you want to pump 10 GPM it requires 50 HP or if you want to pump 10 Gallons / day it requires (50HP/ 24h 60min )requiring 0,035 HP.. Again I apologize for delay. On Wed, Mar 16, 2022 at 1:33 AM William Miller <will...@millersolar.com> wrote: Hilton: A valid point. However in this region wells often do not recharge as well as we might like. In these cases, to meet gallons per day you have to pump long and slow--more hours per day than the sun will be up. That means of course generator or battery storage. The economics have shifted from when I started installing direct-DC water pumping. The money that is being spent today to provide commercial ag water is beyond what I would have comprehended back then. This means new technology--and questions need to be asked, including considering battery storage. Thanks for your reply. William Miller Solar 17395 Oak Road, Atascadero, CA 93422 805-438-5600 www.millersolar.com CA Lic. 773985 -----Original Message----- From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Hilton Dier Sent: Tuesday, March 15, 2022 6:56 PM To: RE-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] Water Pumping 24/7 Here’s a lateral take on this. A 500 gallon poly water tank is far cheaper than the batteries needed to fill it. Years ago I rigged up a seasonal pump system for a man who had two ponds on his property. The lower one was well fed by a spring but the upper one wasn’t. I used a 200 watt DC piston pump and a couple of modules with a linear current booster. A couple of breakers but no batteries. It just chugged away quietly all (moderately sunny) day, filling the upper pond. Using a positive displacement pump is key for minimizing power requirements. At 300 feet that’s about 125 psi, which is not out of line for a piston pump. Fill a big poly tank and pressurize it with a small DC diaphragm pump if necessary. Simple, efficient, cheap. Hilton Dier III Renewable Energy Design Missisquoi River Hydro LLC _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org 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 There are two list archives for searching. 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