<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">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.</div>
<div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">I'm going to guess your 3/4HP well pump will be a breeze to start with this inverter.</div>
<br><br><div id="WISESTAMP_SIG_gmail_session" href="http://WISESTAMP_SIG_gmail_session"><div style="font-size:13px;font-family:Verdana,Arial,Helvetica,sans-serif"><div style="margin:0 0 8px 0"><p style="margin:0"><span><span>Jason Szumlanski </span></span></p>
<p style="margin:0"><span><span></span></span></p><div class="gmail_default" style="font-family:verdana,sans-serif;display:inline">Fafco Solar</div><br><p></p></div></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Wed, Jul 2, 2014 at 10:47 AM, Allan Sindelar <span dir="ltr"><<a href="mailto:allan@sindelarsolar.com" target="_blank">allan@sindelarsolar.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="background-color:rgb(255,255,255);color:rgb(0,0,0)" bgcolor="#FFFFFF" text="#000000">
<div>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>
<div>
<div>
<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a href="mailto:allan@sindelarsolar.com" target="_blank">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>Positive Energy,
Inc.</span><br>
<b><a href="tel:505%20780-2738" value="+15057802738" target="_blank">505 780-2738</a> cell</b><br>
<br>
<b><u></u><u></u></b></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div><div><div class="h5">
On 7/2/2014 8:17 AM, Drake wrote:<br>
</div></div></div>
<blockquote type="cite"><div><div class="h5">
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>
<a href="tel:740-448-7328" value="+17404487328" target="_blank">740-448-7328</a><br>
</i><a href="http://athens-electric.com/" target="_blank">http://athens-electric.com/</a>
<br>
<br>
<fieldset></fieldset>
<br>
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