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<div class="moz-cite-prefix">Based on many successful installs, I'd
say a 3/4 HP pump is not a problem at all, and that the Magnum
could easily run a 1-1/2 HP submersible pump.<br>
2 HP probably, but that's where you start worrying.<br>
The Franklin Subpak controller can be used on regular AC pumps and
not only offers constant pressure, it removes the starting surge.
This is the future for all pumping systems, and it makes the solar
installer's life easier too. Grundfos makes the SQE line (as
others mentioned) but the Franklin Controller is an above ground
solution, that you can wire in without involving the well guy to
pull the pump.<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
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>
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