VFX3524 and 1 HP 240V Gould sub pump....? [RE-wrenches]

[Matt Tritt]

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Hi Travis and Davis,

One way to avoid this type of  problem with submersible pumps is to 
exchange the pump with an SQ. Variable speed pumps have no start-up 
surge to clobber a single off-grid inverter, not to mention that 
Grundfos makes great pumps. It is certainly less expensive to replace a 
pump, provided it's not a huge one, than to add an inverter.

Matt T

Travis Creswell wrote:

>Hello Davis,
>
>Yes, we have done a 1hp 3-wire with a VFX3524/X-240 set up.  Are you using a
>3 wire?  The AC amps will be printed on the control box.  Confirm that your
>AC amps are in line with that before moving on to look at the inverter.  If
>you haven't got a control box then your problem has been identified as I
>don't think a single inverter is going to start a 1hp 2-wire pump.
>
>The inverter will shut off after a few seconds of 50 amps or greater.  What
>the DC voltage doing during all this?  Is it falling below the cut off of
>the inverter?
>
>190 amps sounds a lot higher then what I was seeing at our installation.
>>From memory we saw 90-120 amps at start up and ~70 amps running.
>
>We did have a problem which even damaged a few of the inverters boards
>several times before we figured it out. Turned out that the start winding of
>the pump was the problem not the inverter.  It was really hard to diagnose
>because it was intermittent.  No one involved had ever seen that happen (the
>story of my life).
>
>Best,
>Travis Creswell
>Ozark Energy Services
>
>
>-----Original Message-----
>From: Davis Terrell [mailto:cvsolar3 at sover.net] 
>Sent: Wednesday, September 20, 2006 7:15 AM
>To: RE-wrenches at topica.com
>Subject: VFX3524 and 1 HP 240V Gould sub pump....? [RE-wrenches]
>
>
>
>Anyone have any experience running 1 HP 240VAC submersible well pumps off of
>a single VFX3524 stepped up with an X-240?  The pump is approx 500' down.
>The trimetric reads about 190 A @ 24VDC (before their TFX2524 kicks off).
>Outback said the VFX3648 is good for a 1 HP and that the 24 V should handle
>it just as well. Just wanted to see what others thought before I did
>anything else. Thanks.
>
> 
>
>Davis Terrell
>
>Central Vermont Solar & Wind
>
>802-747-0577 / f: 802-773-0924
>
>www.cvsolar.com
>
> 
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>
>
>
>  
>


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