Even at 9600W, which is above the 5 second surge rating of the inverter, we're looking at about 200A on the DC side, which would be a 1-hr rate on an L-16 string. While that is high, it should not be an issue. Even at the 1ms surge of 16,800W, a 48 string of L16's should be able to handle that.
Jason Szumlanski Fafco Solar On Wed, Jul 2, 2014 at 2:35 PM, Roy Butler <[email protected]> wrote: > I haven't seen anyone mention the battery bank. If I understand > correctly, there's a single string of sealed > L16 batteries on this inverter. I have my doubts as to whether or not that > bank can provide the high current > the inverter needs to start this load. > > Roy Butler > NABCEP Certified Solar PV Installer® > NYSERDA eligible PV & wind installer > IREC Certified Master Trainer™ for Small Wind Installer > Four Winds Renewable Energy, LLC > 8902 Route 46, Arkport, NY 14807607-324-9747 www.four-winds-energy.com > > Join us at the 10th Annual Small Wind Conference > A Gathering of Installers, Manufacturers, Dealers, & Distributors > June 17 and 18, 2014 in Stevens Point, Wisconsinwww.smallwindconference.com > > Although no trees were killed in the sending of this message, > a large number of electrons were terribly inconvenienced. > > > > On 7/2/2014 2:10 PM, Jason Szumlanski wrote: > > To further qualify my statements, the inverter will start the pump > without issue, but I should echo the warnings by others that if there are > other loads present, especially other motor loads that could start > concurrently, you may experience issues. As long as your customer > understands the limitations and possibilities, you may be just fine. > > > Jason Szumlanski > > Fafco Solar > > > > On Wed, Jul 2, 2014 at 11:00 AM, Jason Szumlanski <[email protected]> > wrote: > >> For what it's worth, I've run a single speed 1.5HP pool pump with a >> MS4448PAE in a mobile application on a 38.4kWh battery bank (sixteen Rolls >> S-530's). I have also run a 2.5HP Hayward EcoStar Variable Speed pool pump >> at full RPM, but that startup current is likely less than you well pump. >> >> I'm going to guess your 3/4HP well pump will be a breeze to start with >> this inverter. >> >> >> Jason Szumlanski >> >> Fafco Solar >> >> >> >> On Wed, Jul 2, 2014 at 10:47 AM, Allan Sindelar <[email protected] >> > wrote: >> >>> Drake, >>> As a normal CYA, I'll always gently let a customer know that this (or >>> any) particular combination of inverter and load sometimes proves >>> incompatible, just in case the unexpected happens. (We once had a MS4448 >>> that would not reliably start and run a condensing boiler; a switch to a >>> different boiler resolved the issue.) >>> >>> Having said that note of caution, I wouldn't give it any concern. 3/4 HP >>> and 1 HP well pumps have never been an issue; I would expect 1.5 HP to be >>> easy to run. At 2 HP I'd be asking these questions here. >>> >>> You might check that it's a 3-wire, capacitor-start motor, but nowadays >>> nearly all are. Two-wire pumps (with no control box) can add 50% to the >>> surge. >>> >>> The Magnum has a fairly poor voltage regulation response. Sometimes the >>> AC voltage can drop to ~80 VAC momentarily. So you might also caution your >>> customer that the lights may flicker when the pump starts. In our home we >>> know whenever our Kenmore fridge turns on. >>> >>> Allan >>> >>> *Allan Sindelar* >>> [email protected] >>> NABCEP Certified PV Installation Professional >>> NABCEP Certified Technical Sales Professional >>> New Mexico EE98J Journeyman Electrician >>> Founder (Retired), Positive Energy, Inc. >>> *505 780-2738 <505%20780-2738> cell* >>> >>> >>> On 7/2/2014 8:17 AM, Drake wrote: >>> >>> Hello Wrenches, >>> >>> We are hoping to use a Magnum PAE 4448 to back up a household that >>> includes a 3/4 HP deep well pump. There is about 120 feet of vertical rise >>> and about 1000 feet of horizontal distance. >>> >>> I have been told that there is a correlation between the locked rotor >>> current of a pump and the predictable ability of a specified inverter to >>> power that pump. >>> >>> The plumber who installed the pump left no paperwork and retained no >>> records of what pump he put in the hole last year. He could only say it was >>> a 3/4 HP pump. We are therefore unable to obtain the manufacturer's >>> nameplate specifications. >>> >>> The Magnum PAE 4448 has a 1 mS surge of 70 A (at 240 V) and a 100 MS >>> surge of 40 A. According to the NEC Table 430.251(A), a 3/4 HP motor has a >>> locked rotor current of 41.4 amps at 230 V. >>> >>> This inverter can surge at 35.4 A for 5 seconds. The specified battery >>> bank will be 8 Full River L-16 AGMs. Can anyone say if: >>> >>> - Is there enough information to know if this setup will handle the >>> pump, and if so, will it? >>> - How can an inverter's ability to power a motor or pump be >>> calculated by knowing its locked rotor current? Which surge periods >>> should >>> be compared to the locked rotor current? >>> - Does the surge current need to equal locked rotor. How long must >>> the inverter meet its required maximum surge? >>> - From experience with Magnums and pumps, does this seem like a good >>> combination? >>> >>> >>> Thank you, >>> >>> Drake >>> >>> Drake Chamberlin >>> >>> >>> >>> >>> >>> *Athens Electric LLC OH License 44810 CO License 3773 NABCEP Certified >>> Solar PV 740-448-7328 <740-448-7328> *http://athens-electric.com/ >>> >>> >
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