Great ideas on load management to save the DC/AC system sizing. I haven’t spent time researching their need for this 3hp pump or age and all, but definitely worth looking at that side. Since it does pump to the 3000g gravity feed tank up the hill. What’s strange is there is still a bladder tank in the garage, possibly decommissioned when they added the gravity system.
Sincerely, Chris Worcester Solar Wind Works NABCEP Certified PV Installer Phone: 530-582-4503 Fax: 530-582-4603 <http://www.solarwindworks.com/> www.solarwindworks.com <mailto:ch...@solarwindworks.com> ch...@solarwindworks.com "Proven Energy Solutions" From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Allan Sindelar Sent: Tuesday, June 15, 2010 8:48 PM To: jry...@netscape.com; RE-wrenches Subject: Re: [RE-wrenches] two VFX3524's and a Franklin 3hp sub pump Chris, We deal with deep wells routinely. Recently we installed a GTWB system for a very enjoyable retired couple. Their needs included the goat milker, sheep barn, two freezers and a fridge, and irrigation well pump, with the system sized for continuous operation in the event of a long-term (i.e. permanent) loss of the grid. This was on one acre in the suburbs south of Albuquerque. We used an XW4548, as it was the only battery-based, 120/240, single-inverter, grid-tie unit available currently. As part of the normal load-reduction process, we determined that the 2hp conventional well pump could be replaced with a 1hp soft-start SQ and have adequate head and flow for their sprinklers. Changing out the pump way more than paid for itself in the amount of inverter capacity we didn't need. I would encourage you to look at both of these related issues carefully as part of this situation: could a smaller pump meet the head and flow requirements of this site, and is a soft-start pump available? Usually, if an inverter or stack of them can't handle a big inductive load like a conventional pump, it's because of the starting surge. I suspect a smaller soft-start pump may be doable in your situation. Allan Allan Sindelar <mailto:al...@positiveenergysolar.com> al...@positiveenergysolar.com NABCEP Certified Photovoltaic Installer EE98J Journeyman Electrician Positive Energy, Inc. 3201 Calle Marie Santa Fe, New Mexico 87507 505 424-1112 <http://www.positiveenergysolar.com/> www.positiveenergysolar.com Hello offgrid Wrenches, I just inherited an off grid system with one VFX3524 inverter running the home loads, and a 17kW Guardian Generac they use for charging (through an X-240 back into the inverter) & to run their Franklin 3hp 240 VAC well pump, S. F. max amp 17.0 ( rated on its controller) This is a really convoluted system as they have another 120/240 VAC Transformer to have the inverter talk to the 240 volt signal the gen set needs to see. Yikes. So I am proposing to add a second inverter if it can run the well pump and eliminate the extra transformer. This will also reduce gen set run time in half while battery charging, a big plus with the nice 24V Hawker battery bank, 1020 AH at the 6 hour rate. There aren’t any other unusual large AC loads in the home, just the fridge, washer, computer, and such. LPG for cooking, water heating, clothes dryer. Thanks in advance for all ideas here! Sincerely, Chris Worcester Solar Wind Works NABCEP Certified PV Installer Phone: 530-582-4503 Fax: 530-582-4603 <http://www.solarwindworks.com/> www.solarwindworks.com <mailto:ch...@solarwindworks.com> ch...@solarwindworks.com "Proven Energy Solutions"
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