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<p>David,</p>
<p><br>
</p>
<p>The SW4024 inverter has a SELL mode that allows power to flow
back to the grid from the AC1 terminals. Make sure that the SELL
mode is not selected; that may take of the problem. If not,
connect the utility power to the AC2 terminals, it shouldn't be
possible for the SW inverter to backfeed power to the the AC2
terminals.</p>
<p><br>
</p>
<p>Kent Osterberg</p>
<p>Blue Mountain Solar<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 1/10/2026 1:12 PM, David Palumbo via
RE-wrenches wrote:<br>
</div>
<blockquote type="cite" cite="mid:DM6PR20MB2665BF894A97E2DB00E1E668A683A@DM6PR20MB2665.namprd20.prod.outlook.com">
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Wrench,</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
<br>
</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
An off-grid installation of mine from many years ago has is now
using grid power instead of a generator. The utility is telling
the homeowner that they are going to disconnect him because his
house is back feeding 1 amp into their grid power.</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
<br>
</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
I've been retired for many years now and did not do any of the
work to connect the utility power to his Trace SW4024
inverter/charger. The utility power became available when his
son brought in utility power for his maple sugaring operation in
the neighborhood, and the father connected power to his house to
replace his fossil fueled generator for additional charging into
his battery bank. They do not have a grid interconnect sellback
agreement with the utility.</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
<br>
</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
I have no experience with this, but I'm assuming that the
utility grid is seeing power from its input connection to his
Trace SW4024. Does that sound right? If so, is there a simple
solution to fix this problem while continuing to use the grid
power through his SW inverter? </div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
<br>
</div>
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Thanks for any advice that may help.</div>
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<br>
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David Palumbo</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Hyde Park, VT</div>
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