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<p>A Sunny Island (SI) will export excess energy to the grid when
the battery voltage is driven above its target voltage (IE absorb
or float) <br>
</p>
<p>so in the case of using a Classic or any other charge controller,
the charge controller needs to be set to a higher voltage than the
SI.</p>
<p> Typically I recommend setting the SI charge voltages about 1v
lower than your Charge controller. <br>
</p>
<p>The issue with using the Midnite MNSICOMM is the SI tells the
classic what to charge to so it never pushes the battery <br>
</p>
<p>voltage above the setpoint, therefore it never sells.</p>
<p>boB<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2/18/2019 7:54 AM, Mac Lewis wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAOABG488r6_UKjhEV69Ky+XmX=G--L7fMVSVMtFYctLi+DB=nQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Hi Brad,<br>
<div><br>
</div>
<div>I have heard that the selling from the Midnite charge
controllers doesn't work real well. There is a MNSI comm box
so it may be the best way (certainly the cheapest). Does
anyone have experience with this scenario, good or bad?</div>
<div><br>
</div>
<div>Thanks for your input as always</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Feb 18, 2019 at 8:27
AM Bradley Bassett <<a href="mailto:bbassett2@gmail.com"
moz-do-not-send="true">bbassett2@gmail.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div>I think you can leave it DC coupled and enable grid tie
in the Sunny Island inverters. It might not be quite as
efficient but a lot more cost effective. If you don't
already have it Midnite makes a comm box that makes the
Classic look like an SMA device. That might be helpful to
coordinate MPPT and grid tie.<br>
</div>
<div><br>
</div>
<div>Brad<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Feb 18, 2019 at
5:19 AM Mac Lewis <<a href="mailto:maclewis1@gmail.com"
target="_blank" moz-do-not-send="true">maclewis1@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div dir="ltr">Hello Wrenches,,
<div>
<div><br>
</div>
<div>We have been asked to take an SMA Sunny Island
System that is off-grid, and convert it to a backup
system (Quad stack). Currently, this is a DC
coupled system using Midnite charge controllers. We
would like to add SMA grid-tied inverters to
backfeed excess power. I have located this
document:</div>
<div><a
href="https://files.sma.de/dl/7910/SB-OffGrid-TI-US-en-19.pdf"
target="_blank" moz-do-not-send="true">https://files.sma.de/dl/7910/SB-OffGrid-TI-US-en-19.pdf</a></div>
<div><br>
</div>
<div>According to this document, there really isn't
Sunny Boy inverters available that can function as a
backup for a system like this. Is this true? </div>
<div>Do you know of any distributors that may have
stock of the SB XXXXTLUS-12 line of inverters that
would work for this.</div>
<div><br>
</div>
<div>Thanks for your assistance</div>
<div><br>
</div>
-- <br>
<div dir="ltr"
class="gmail-m_5762377754409523248gmail-m_8859024066426421094gmail_signature">
<div><br>
</div>
<div><font face="'times new roman', serif"
color="#305A78"><br>
</font></div>
<div><br>
</div>
Mac Lewis<br>
<br>
<span style="font-family:"Times New
Roman";font-size:medium;color:rgb(255,153,0)"><b><font
size="3" face="Arial, Helvetica, sans-serif">
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Helvetica, sans-serif" color="#000000"><span
style="font-size:small"><span
style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font
face="'times new roman', serif">"Yo
solo sé que no sé nada." </font><span
style="font-weight:700;color:rgb(104,104,104)"><font face="'times new
roman', serif">-Sócrates</font></span></span></span></font></p>
</font></b></span></div>
</div>
</div>
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-- <br>
<div dir="ltr" class="gmail_signature">
<div><br>
</div>
<div><font face="'times new roman', serif" color="#305A78"><br>
</font></div>
<div><br>
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Mac Lewis<br>
<br>
<span style="font-family:"Times New
Roman";font-size:medium;color:rgb(255,153,0)"><b><font
size="3" face="Arial, Helvetica, sans-serif">
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sans-serif" color="#000000"><span
style="font-size:small"><span
style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font
face="'times new roman', serif">"Yo solo sé que
no sé nada." </font><span
style="font-weight:700;color:rgb(104,104,104)"><font
face="'times new roman', serif">-Sócrates</font></span></span></span></font></p>
</font></b></span></div>
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