Sorry, typo - that's a 48V string (one string of 8 batteries). Jason Szumlanski
Fafco Solar On Wed, Jul 2, 2014 at 3:15 PM, Jason Szumlanski <[email protected]> wrote: > 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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