Hi Jay, If it hasn’t been mentioned yet, a surface pump will break suction or cavitate if too high from the source, so I’d put it in the hole so it’s not more than 6’ to 9’ above the static water level in the well. You will need a way to prime the pump too.
Chris Worcester Solar Wind Works NABCEP Certified PV Installer Office 530-582-4503 Cell 530-448-9692 Fax 530-582-4603 www.solarwindworks.com [email protected] From: RE-wrenches [mailto:[email protected]] On Behalf Of Brian Teitelbaum Sent: Wednesday, August 03, 2016 9:40 AM To: RE-wrenches Subject: Re: [RE-wrenches] Pump ideas Jay, Is that 140 “feet” of head, or really 140 psi (about equal to 323 ft of head at sea level)? I’ll assume the 140 psi And I’ll assume that you want to run the pump PV-direct, without batteries or an inverter. Can the “well” be dug deeper? If they can dig it out another few feet or so, creating a deeper pool, that would keep the drawn-out water much cleaner You might want to look at the Grundfos CRFlex surface pumps. They have motors with the same AC/DC voltage specs as the SQFlex pumps, but they also have a control panel where you can adjust the motor speed. These pumps do have higher water flow-rate specs, but maybe you could adjust it down enough to get the 3-4 gpm rate. According to the pump chart, the CRFlex model 1-17 will pump about 4 gpm at 328 ft of head with about 750W of power. Unfortunately, I don’t have enough experience with these pumps to know for sure about the ability or limitations of adjusting the motor speed, but I am looking for a Guinea Pig. (If any of you fine Wrenches out there have any experience with adjusting the CRFlex motor speed, please contact me off-list) Jay - contact me off-list if want to discuss using one of these pumps. Brian Teitelbaum AEE Solar From: RE-wrenches [mailto: <mailto:[email protected]> [email protected]] On Behalf Of Jay Sent: Tuesday, August 02, 2016 9:44 AM To: RE-wrenches Subject: [RE-wrenches] Pump ideas Hi all I've got a pump choice question 140psi lift 3-4gpm max 12' suction out of shallow well 2' water depth in well 2' diameter well Slight sediment, clay mostly. 120/240vac power Submersible won't work, too shallow Slow pump I'm concerned about filter changes Surface pump makes most sense. Any recommendations? Thanks Jay
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