<font size="2"><font face="arial,helvetica,sans-serif">Use an ac charger to charge a small battery when the generator runs each evening, and then power a timer or photosensor from the battery. Sears, <$40. I wouldn't worry about the phantom load of the timer -- you're running an 8kW diesel genset throughout the night. It oughta keep up. <br clear="all">
</font></font><div><div><font class="Apple-style-span" face="arial, helvetica, sans-serif"><br></font></div><div><font class="Apple-style-span" face="arial, helvetica, sans-serif">The question I can't answer is how this makes sense, with diesel above $4/gallon and service every 100 hours. Did you look at an Aerovironment UPC controller running array direct with a standard AC pump? </font></div>
<div><font class="Apple-style-span" face="arial, helvetica, sans-serif"><br></font></div><div>Phil<div>-----------</div><div><span style="font-family:Arial, Helvetica, sans-serif;font-size:12px;line-height:15px">"</span><span style="font-family:Arial, Helvetica, sans-serif;font-size:12px;line-height:15px">When we learn how to store electricity, we will cease being apes ourselves; until then we are tailless orangutans. You see, we should utilize natural forces and thus get all of our power. Sunshine is a form of energy, and the winds and the tides are manifestations of energy. </span><span style="font-family:Arial, Helvetica, sans-serif;font-size:12px;line-height:15px">Do we use them? Oh, no! We burn up wood and coal, as renters burn up the front fence for fuel. We live like squatters, not as if we owned the property. </span></div>
<div><span style="font-family:Arial, Helvetica, sans-serif;font-size:12px;line-height:15px"><br></span></div><div><span style="font-family:Arial, Helvetica, sans-serif;font-size:12px;line-height:15px"></span><span style="font-family:Arial, Helvetica, sans-serif;font-size:12px;line-height:15px">There must surely come a time when heat and power will be stored in unlimited quantities in every community, all gathered by natural forces."</span></div>
<div><span style="font-family:Arial, Helvetica, sans-serif;font-size:12px;line-height:15px">-- Thomas Edison --</span></div><br>
<br><br><div class="gmail_quote">On Tue, Jul 5, 2011 at 4:28 PM, Allan Sindelar <span dir="ltr"><<a href="mailto:allan@positiveenergysolar.com">allan@positiveenergysolar.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<u></u>
<div bgcolor="#ffffff" text="#000000">
Wrenches,<br>
A good client of ours is a rancher in the New Mexico/Arizona border
area. He has a specific need for which I couldn't offer a simple
system.<br>
<br>
He needs to raise water from a lake 400+/- vertical feet to a 100K
gallon storage tank for agricultural use. The site is remote. The
amount is substantial - about 10-12 gpm continuously, 24/7. He would
like to use 4 Grundfos SQ Flex pumps at about 2.5-3 gpm, each
running array-direct feeding a common pipe to the tank. He then
wants to use about an 8kW (derated to 6kW for 7,500' elevation)
diesel generator (with standard two-wire automatic start) to run all
four pumps when the sun goes down, and shut off and transfer back to
PV when the sun comes up the next morning.<br>
<br>
How might this be done? If we assume that each pump has four 210W
modules, that would be an 80Vnom array with MPP around 120V and Voc
around 150V. I would assume that both of these voltages are too high
to use any stand-alone AGS, such as Atkinson or Magnum. We
considered a separate tiny 12V or 24V battery with small PV module,
used just to power an AGS voltage sense signal, with the voltage
difference between float (13.6V) and rest (12.7V) triggering a
voltage-actuated start signal, but rejected this as problematic as
battery temperatures affected charge voltages. A self-contained time
switch, such as some of the newer Intermatic units, might work, if
the right model can be identified and isn't a substantial phantom
load.<br>
<br>
We would also have to adapt a relay to switch between sources, with
a 120 or 240 V AC relay coil current, energized by the generator.
The Grundfos IO101 AC interface unit is manual only.<br>
<br>
Has anyone solved this problem? Any ideas for a reasonably simple
and trouble-free approach would be welcome.<br>
Thank you,<br>
Allan<br>
<br>
<div>-- <br>
<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a href="mailto:Allan@positiveenergysolar.com" target="_blank"><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
Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
<b>Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b><a href="tel:505%20424-1112" value="+15054241112" target="_blank">505 424-1112</a></b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a><u></u><u></u></span></font>
<p class="MsoNormal" style="margin-right:722.25pt"><span style="font-size:10pt"><font face="Times New Roman, Times,
serif"><u></u><u></u><u></u><u></u><u></u><u></u><u></u><u></u></font><b><br>
</b></span></p>
<span style="font-size:10pt"><br>
</span> </div>
</div>
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