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This information helps greatly. I really appreciate all of your expert
advice.<br><br>
One other wild card in the installation is that the inverter is going to
be AC coupled with an Enphase system. The Enphase system will contribute
greatly to the overall power available in the protected loads panel. But,
with Magnum's slow voltage response I'm not sure if the Enphase system
will drop off line when the pump surges, or if the Enphase power will be
available to help with the startup surge. <br><br>
Any insights on this?<br><br>
Thank you,<br><br>
Drake<br><br>
<br><br>
At 02:10 PM 7/2/2014, you wrote:<br>
<blockquote type=cite class=cite cite="">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.<br><br>
<br>
Jason Szumlanski<br><br>
​Fafco Solar​<br><br>
<img src="http://ws-stats.appspot.com/ga/pixel.png?yes__count=true &e=legacy_impression" alt="[]">
<br><br>
<br>
On Wed, Jul 2, 2014 at 11:00 AM, Jason Szumlanski
<<a href="mailto:jason@fafcosolar.com">jason@fafcosolar.com</a>>
wrote:<br>
<dl>
<dd>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.<br><br>
<dd>I'm going to guess your 3/4HP well pump will be a breeze to start
with this inverter.<br><br>
<br>
<dd>Jason Szumlanski <br><br>
<dd>​Fafco Solar​<br><br>
<br><br>
<dd>On Wed, Jul 2, 2014 at 10:47 AM, Allan Sindelar
<<a href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a>
> wrote:<br>
<dl>
<dd>Drake,<br>
<dd>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>
<dd>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>
<dd>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>
<dd>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>
<dd>Allan<br><br>
<dd>Allan Sindelar</b><br>
<dd><a href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a>
<br>
<dd>NABCEP Certified PV Installation Professional<br>
<dd>NABCEP Certified Technical Sales Professional<br>
<dd>New Mexico EE98J Journeyman Electrician<br>
<dd>Founder (Retired), Positive Energy, Inc.<br>
<dd><a href="tel:505%20780-2738">505 780-2738</a> cell</b><br><br>
<dd>Â <br>
<dd>On 7/2/2014 8:17 AM, Drake wrote:<br>
<blockquote type=cite class=cite cite="">
<dd>Hello Wrenches,<br><br>
<dd>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>
<dd>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>
<dd>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>
<dd>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>
<dd>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:
<dd>Is there enough information to know if this setup will handle the
pump, and if so, will it?
<dd>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?
<dd>Does the surge current need to equal locked rotor. How long must the
inverter meet its required maximum surge?
<dd>From experience with Magnums and pumps, does this seem like a good
combination? <br>
<dd>Thank you,<br><br>
<dd>Drake <br><br>
<dd>Drake Chamberlin<br>
<dd>Athens Electric LLC<br>
<dd>OH License 44810<br>
<dd>CO License 3773<br>
<dd>NABCEP Certified Solar PV <br>
<dd><a href="tel:740-448-7328">740-448-7328</a><br>
</i>
<dd><a href="http://athens-electric.com/">http://athens-electric.com/</a>
 </blockquote><br>
</dl>
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