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<p>There are a few of these EG4 solar hybrid units in my area, all
installed by homeowners on Off Grid homes, they have to be
connected to the homes AC system so that when the sun isn't
shining they will run just as well off 120vac. I'm assuming when
the sun is shining the outdoor and indoor unit are powered by the
solar modules, they don't run without the 120vac connected. They
also will heat the home in the winter but not as well as they
cool.</p>
<p> Carl Hansen</p>
<p> Hansen&Sun Electric</p>
<p> 505 470-0770 <br>
</p>
<div class="moz-cite-prefix">On 2025-06-19 11:53 AM, William Miller
via RE-wrenches wrote:<br>
</div>
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cite="mid:b3cdf3c409ade231d51632eafbaba708@mail.gmail.com">
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<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">There
are two reasons I could see:,</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span
style="font-family:Symbol;color:#1f497d"><span
style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman""> </span></span></span><span
style="font-family:"Verdana","sans-serif";color:#1f497d">Your
existing PV rating is too small.</span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><span
style="font-family:Symbol;color:#1f497d"><span
style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman""> </span></span></span><span
style="font-family:"Verdana","sans-serif";color:#1f497d">You
do not have any existing PV and you do not want to incur
more utility expenses.</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">I
do see a real limitation to direct-DC air conditioning
(which I think is what we are discussing): No AC when the
sun is not high in the sky. That alone makes this
impractical</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">William</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">Miller
Solar</span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">17395
Oak Road, Atascadero, CA 93422</span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">805-438-5600</span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d"><a
href="http://www.millersolar.com/" moz-do-not-send="true"><span
style="color:blue">www.millersolar.com</span></a></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">CA
Lic. 773985</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
RE-wrenches [mailto:<a
href="mailto:re-wrenches-bounces@lists.re-wrenches.org"
moz-do-not-send="true" class="moz-txt-link-freetext">re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b>Jason Szumlanski via RE-wrenches<br>
<b>Sent:</b> Thursday, June 19, 2025 10:25 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Cc:</b> Jason Szumlanski<br>
<b>Subject:</b> Re: [RE-wrenches] EG4 Mini Split</span></p>
<p class="MsoNormal"> </p>
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<div>
<p class="MsoNormal">I guess the secondary question is why
would anyone use this system anyway in a grid
interconnected environment. The only rationale I could see
is to have some level of air conditioning when the sun is
shining without having to go through the expense of adding
a hybrid inverter and batteries. But by the time you
install solar panels with a rapid shutdown system, the
return on that investment seems terrible considering that
much of the solar energy generated will be wasted unless
you somehow need maximum cooling from this unit 365 days a
year during the daylight hours. </p>
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<p class="MsoNormal"><br>
Jason Szumlanski</p>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#333333">Principal
Solar Designer | Florida Solar Design Group<br>
NABCEP Certified Solar Professional (PVIP)<br>
Florida State Certified Solar Contractor CVC56956</span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-family:"Helvetica","sans-serif";color:#333333">Florida
Certified Electrical Contractor EC13013208</span></p>
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<div>
<p class="MsoNormal">On Thu, Jun 19, 2025, 6:15 AM Jason
Szumlanski <<a
href="mailto:jason@floridasolardesigngroup.com"
moz-do-not-send="true" class="moz-txt-link-freetext">jason@floridasolardesigngroup.com</a>>
wrote:</p>
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<p class="MsoNormal">I'm getting requests to install 4-6
panels for these mini-splits. I'm saying no so far,
but it got me thinking... What are people doing for
rapid shutdown for these systems? I can't see them
being exempt. The manual is silent on the issue. It
just shows a DC isolator from the panels to the point
of connection in the unit. </p>
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<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Jason Szumlanski </p>
</div>
<div>
<p class="MsoNormal">Florida Solar Design Group </p>
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