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<div class="moz-cite-prefix">Drake,<br>
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.)<br>
<br>
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. <br>
<br>
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.<br>
<br>
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.<br>
<br>
Allan<br>
<br>
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<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a
href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span
style="mso-bidi-font-weight:bold">Positive Energy,
Inc.</span><br>
<b>505 780-2738 cell</b><br
style="mso-special-character:line-break">
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On 7/2/2014 8:17 AM, Drake wrote:<br>
</div>
<blockquote cite="mid:20140702141702.3F5231036C@che.dreamhost.com"
type="cite">
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>
<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>
<li>Does the surge current need to equal locked rotor. How long
must the
inverter meet its required maximum surge?
</li>
<li>From experience with Magnums and pumps, does this seem like
a good
combination?
</li>
</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 moz-do-not-send="true" href="http://athens-electric.com/">http://athens-electric.com/</a>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
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