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Hello Wrenches,<br><br>
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. <br><br>
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. <br><br>
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.<br><br>
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. <br><br>
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:
<ul>
<li>Is there enough information to know if this setup will handle the
pump, and if so, will it?
<li>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?
<li>Does the surge current need to equal locked rotor. How long must the
inverter meet its required maximum surge?
<li>From experience with Magnums and pumps, does this seem like a good
combination?
</ul><br>
Thank you,<br><br>
Drake <br><br>
Drake Chamberlin<br>
<i>Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV <br>
740-448-7328<br>
</i><a href="http://athens-electric.com/">http://athens-electric.com/</a>
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