[RE-wrenches] Magnum and Pumps

[Drake]

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/>http://athens-electric.com/
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