<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>I was reading up on the SQF pump and do remember seeing something about efficiency at higher voltages. Can't remember if it got better or worse. </div><div><br></div><div>Jesse<br><br>Sent from my iPhone</div><div><br>On May 30, 2013, at 6:44 PM, Allan Sindelar <<a href="mailto:allan@positiveenergysolar.com">allan@positiveenergysolar.com</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<div class="moz-cite-prefix">Todd,<br>
The SQF runs on 30V or more, but is happiest above 90V according
to Grundfos, and I have never heard anything suggesting a
disadvantage to the higher voltages.<br>
<br>
I think the 1400 watts is a theoretical maximum, and the pump will
vary its operation and output according to the available wattage (<i>not</i>
the available current). Most SQFs effectively max out at around
800-900 watts. In fact, my pump curves on the 11SQF-2 max out at
900 watts at 300' of head. <br>
<br>
You'd probably do just fine with a single series string of 10-12
modules.<br>
<br>
What I don't know is to what degree you need to worry about low
temperature VOC limits; I'd be careful about getting too close to
300V.<br>
Allan<br>
<br>
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<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a href="mailto:Allan@positiveenergysolar.com"><font color="#000099" face="Times New Roman, Times, serif"><u>Allan@positiveenergysolar.com</u></font></a></small><font face="Times New Roman, Times, serif"><br>
<span style="font-size: 10pt;">NABCEP Certified Photovoltaic
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Founder and Chief Technology Officer<br>
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On 5/30/2013 4:29 PM, Todd Cory wrote:<br>
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<font size="+1"><font face="Arial">this question is part 2 about
the customer with the used astropower 75 watt modules -<br>
<br>
he has a grundfos 11sqf-2 already set by the well driller. the
input specifications for the cu200 pump & controller are
30 to 300 vdc, 1400 watts, 8 amps. <br>
<br>
this will initially be running array direct and i am trying to
figure out the wire loss from the modules to the cu200
controller. to do that i need voltage and current numbers. im
assuming the higher the voltage the lower the running current?
<br>
from the specs above: 1400 watts divided by 8 amps = 175
volts... so if i feed this with closer to 300 volts would that
mean the running current would drop to around 4.6 amps?<br>
<br>
thanks for the help,<br>
<br>
todd<br>
<br>
<br>
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