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<div class="moz-cite-prefix">Ryan,<br>
I may have found the answer to my original post, but it raises
more questions. <br>
<br>
I wrote that these were MV units (MNSPD300), but I checked with my
lead tech and learned that in both cases he used LV units
(MNSPD115). Could this be the reason? He told me that he has used
the LV with 120V inverters and the MV with 120/240V inverters. The
instruction manual states that the LV units are designed to be
used on nominal 90VAC and 115VDC circuits, and have a Maximum
Continuous Operating Voltage of 180V. The manual states: "The
MidNite Solar SPD voltage rating should be chosen according to the
nominal voltage of the system. Do not install an SPD with Maximum
Continuous Operating Voltage (MCOV) below the nominal voltage of
the system; this will deteriorate the SPD and making it
unavailable when you most need it." If this is true, then the LV
(with its 180 MCOV) should be fine at 120VAC. The instructions are
confusing: should we use an MNSPD115 or an MNSPD300 with 120VAC
output? And in this case, could this be the cause of the
failure-to-sleep problem?<br>
<br>
If we should be using the MNSPD300 with 120VAC inverter output,
then the description on the Midnite website is confusing at best.
It states that the MNSPD115 "is designed for both AC and DC
systems and provides protection to service panels, load centers or
where the SPD is directly connected to the electronic device
requiring protection." But service panels and load centers seldom
if ever carry AC at less than 90VAC, the nominal rating of the
MNSPD115. Please clarify all of this!<br>
<br>
Thanks, Allan<br>
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On 8/13/2013 11:28 AM, Ryan wrote:<br>
</div>
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Allan<br>
That is not expected behavior. Which model of SPD are you using?<br>
<br>
Ryan<br>
<img src="cid:part1.05020906.02010702@positiveenergysolar.com"
border="0"><br>
<br>
<br>
<div class="moz-cite-prefix">On 8/13/2013 1:08 PM, Allan Sindelar
wrote:<br>
</div>
<blockquote cite="mid:520A680E.1050302@positiveenergysolar.com"
type="cite">
<meta http-equiv="content-type" content="text/html;
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Wrenches,<br>
Very seldom do inverters in off grid systems ever go to sleep
anymore, given the increase in phantom electronic loads and
greater customer expectations. Coupled with lower module prices,
we usually size larger arrays and inverters remain on
continuously. However, we also service and upgrade many existing
systems, and some customers still want their inverters to go
into search mode. They typically either have gotten used to a
more energy frugal lifestyle over many years, or (to their
credit) choose to buck the system and live with a lighter energy
and resource footprint. <br>
<br>
Twice in recent months we have added Midnite MNSPD MV surge
arrestors to the AC output of smaller systems and discovered
that the inverters will no longer go into search mode. It
doesn't appear to make any difference where the search watts
threshhold is set. One system used a 24V Outback FX2524T (with
current boards following a nearby lightning strike) and the
other used a Magnum MS2812. In the former case, we defeated the
search (against the customer's preference, as she liked the
total silence once her day was done). In the latter, the
customer rejected and we removed the surge arrestor once it
became clear that the inverter wouldn't sleep.<br>
<br>
Has anyone else experienced this? Is there a fix for it? Robin,
can you chime in here (off list if necessary; I'll carefully
post your response)?<br>
<br>
Thank you,<br>
Allan<br>
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<p class="MsoNormal"><b>Allan <span class="SpellE">Sindelar</span></b><br>
<span style="font-size:10.0pt"><a moz-do-not-send="true"
href="mailto:Allan@positiveenergysolar.com"><u><span
style="color:#000099">Allan@positiveenergysolar.com</span></u></a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional <br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder and Chief Technology Officer<br>
<b>Positive Energy, Inc.</b>, a Certified B <span
class="SpellE">Corporation<sup><span
style="font-size:7.5pt">TM</span></sup></span><br>
3209 Richards Lane<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112 office 780-2738 cell</b><br>
<a moz-do-not-send="true"
href="http://www.positiveenergysolar.com/"
target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></p>
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