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.
2 HP probably, but that's where you start worrying.
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.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 7/2/2014 8:17 AM, Drake wrote:
Hello Wrenches,
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.
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.
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.
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.
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:
* Is there enough information to know if this setup will handle the
pump, and if so, will it?
* 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?
* Does the surge current need to equal locked rotor. How long must
the inverter meet its required maximum surge?
* From experience with Magnums and pumps, does this seem like a good
combination?
Thank you,
Drake
Drake Chamberlin
/Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328
/http://athens-electric.com/
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