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<p class="MsoNormal">On 2/24/2012 5:18 PM, jay peltz wrote: </p>
<p class="MsoNormal">Hi Allan, </p>
<p class="MsoNormal">Do I misunderstand you below that you are
saying you don't
need a LCB with a slow pump?</p>
<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal">jay</p>
<br>
<br>
Jay,<br>
The answer turns out to be "definitely maybe".<br>
<br>
The Slowpump spec sheet says: "A linear current booster (controller)
is required to start and run in low light."<br>
<br>
The manual says: "When working against a constant head (vertical
lift) Solar Slowpump requires nearly constant<br>
current, regardless of the voltage/speed. When low light conditions
are present, the PV array<br>
cannot supply full current. The voltage will drop to nearly zero,
and the pump will “stall” (like a<br>
truck trying to start in 4th gear). The remedy is either to add a
PUMP CONTROLLER, also<br>
called LINEAR CURRENT BOOSTER (LCB) to your system. This device will
match the power<br>
source to the load by transforming the voltage down while increasing
the current delivered to the<br>
motor (like an automatic transmission). If you are not using a
controller in your non-battery<br>
system, contact your dealer. It will greatly improve low-light
performance."<br>
<br>
See the last sentence. <br>
<br>
So, unsure about this, I called Windy. Here's what he said: "IF the
motor is being used near its capacity, AND the pump stalls due to an
unrelated obstacle (not just low-light stalling), AND the fuse is
NOT sized just above the normal amp draw of the motor (say a 7A fuse
on a 5A draw on a motor capable of pulling 20A) THEN the motor
windings could overheat before the thermal switch could trip, and
destroy the motor.<br>
<br>
So it's unlikely but possible, and probably a good idea. And it
certainly lengthens the pumping day.<br>
Allan<br>
<br>
<div class="moz-signature">
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
<title></title>
<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
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>505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></font>
<p class="MsoNormal" style="margin-right: 722.25pt;"><span
style="font-size: 10pt;"><font face="Times New Roman, Times,
serif"><st1:place w:st="on"><st1:city w:st="on"></st1:city><st1:state
w:st="on"></st1:state><st1:postalcode w:st="on"></st1:postalcode></st1:place></font><b
style=""><br>
</b></span></p>
<span style="font-size: 10pt;"><br>
</span> </div>
<br>
On 2/24/2012 5:18 PM, jay peltz wrote:
<blockquote cite="mid:32CB9B1B-FD2A-4DE5-A646-628B7FB591EE@asis.com"
type="cite">
<div><br>
</div>
Hi Allan,
<div>Do I missunderstand you below that you are saying you don't
need a LCB with a slow pump?</div>
<div><br>
</div>
<div>thanks,</div>
<div><br>
</div>
<div>jay<br>
<br>
</div>
</blockquote>
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