<div dir="ltr"><div dir="ltr"><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">It just hit <span class="gmail-Q6ibn gmail-ng" style="border-style:none;background:none"><span class="Q6ibn ng" style="border-style:none;background:none">me -</span></span> this must be a carryover from their older version of the GridBOSS that did not accept standard Eaton BR circuit breakers. They sold the original GridBOSS v1 with a breaker <span class="gmail-Asgive gmail-ng" style="border-style:none;background:none">kit with</span> B3S1 breakers manufactured by BSB Electric. You had to buy the breakers from EG4, and they did not offer 15A or 20A breakers for <span class="gmail-Asgive gmail-ng" style="border-style:none;background:none">these</span> circuits. <span class="Q6ibn ng" style="border-style:none;background:none">Intiially</span> they shipped the breakers with the GridBOSS. I remember thinking how wasteful it was for them to send each unit with a bunch of breakers that we didn't use. And then they suddenly started selling the GridBOSS without the breaker kits, and I was derailed on a <span class="Asgive ng" style="border-style:none;background:none">job, not realizing</span> they had made that change.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Here is the excerpt from that manual:</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><img src="cid:ii_mrzergq90" alt="Image 2427.jpg" width="562" height="464"><br></div><br clear="all"></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><br>Jason Szumlanski<br>Principal Solar Designer | Florida Solar Design Group<br>NABCEP Certified Solar Professional (PVIP)<br>Florida State Certified Solar Contractor CVC56956<br>Florida Certified Electrical Contractor EC13013208<br></div><div><br></div><div><br></div></div></div></div><br></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Fri, Jul 24, 2026 at 4:33\u202fPM Jay <<a href="mailto:jay.peltz@gmail.com">jay.peltz@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="auto"><div dir="ltr"></div><div dir="ltr">Is it possible they have the UL listing with those specific breakers?</div><div dir="ltr"><br></div><div dir="ltr">It\u2019s just a breaker. As long as it\u2019s physically compatible in mounting electrically it\u2019s fine. </div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr"><br><blockquote type="cite">On Jul 24, 2026, at 2:25\u202fPM, Jason Szumlanski via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">\ufeff<div dir="ltr"><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">We don't have #10/2 Romex on the trucks usually. It's most convenient to run #14 or #12 to a light fixture usually (if not running it in conduit). And some fixtures <span style="border-style:none;background:none">are not very friendly</span> with a larger <span style="border-style:none;background:none">wire</span> or cables.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">I can't think of any logical reason <span style="border-style:none;background:none">that</span> a lower rated breaker would be a problem. I truly think they just didn't think it through very well when writing the documentation. The lack of 25, 35, and 45A breakers is a prime example. Surely these are okay, right?</div><br clear="all"></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><br>Jason Szumlanski<br>Principal Solar Designer | Florida Solar Design Group<br>NABCEP Certified Solar Professional (PVIP)<br>Florida State Certified Solar Contractor CVC56956<br>Florida Certified Electrical Contractor EC13013208<br></div><div><br></div><div><br></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jul 24, 2026 at 1:00\u202fPM Christopher Warfel via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</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"><u></u>
<div>
<p>Would it make sense just to upsize the conductor for this short
run? </p>
<div>On 7/24/2026 5:47 AM, Jason Szumlanski
via RE-wrenches wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>My read: EG4 likely omitted 15A and 20A because these are <span class="gmail_default" style="font-family:arial,helvetica,sans-serif"></span>c<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">ontemplated</span> as
high-current smart load or AC-coupled inverter ports, not
branch circuit protection for small loads. The GridBOSS is
sized for things like EV chargers, HVAC, <span class="gmail_default" style="font-family:arial,helvetica,sans-serif"></span>w<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">ater heaters
\u2013</span> not standard household <span class="gmail_default" style="font-family:arial,helvetica,sans-serif"></span>r<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">eceptables
and lighting. They expect those to be regular backup loads</span>.<span class="gmail_default" style="font-family:arial,helvetica,sans-serif"> The biggest
example I have to support the need to shed a 20A load is a
pool pump.</span></div>
<div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br>
</span></div>
<div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">Anyway, when
I use a GridBOSS for an off-grid installation, I almost
always use Port 4 for a 15A multiwire branch circuit to
support a convenience outlet and lighting for the area on
one leg and a generator battery charging circuit on the
other leg. I see no issue with it.</span></div>
<div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br>
</span></div>
<div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">One thing
that supports my theory that the breaker ratings are the
maximum supported per port <span style="border-style:none;background:none">is that the
ratings in the table overlap.</span> Looking at the table,
<span style="border-style:none;background:none">on line 1, port
1 supports 90-125A breakers, then the table goes on to
support 30-80A breakers for port</span> 1. The whole <span style="border-style:none;background:none">tables</span>
is a confusing mess. And what about 35A breakers? 45A?
These are common for some mini-split units. They are not in
the table, but surely would not be a problem.</span></div>
<div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br>
</span></div>
<div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">EG4 needs to
revamp this table for clarity.</span></div>
<div><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br>
</span></div>
<div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif">P.S. I have
started using Port 1 as the main load port for smaller
off-grid jobs without even using the 200A backup load port.
I just set port 1 to operate 24 hours a day. This way, you
don't need additional overcurrent protection from an
external main breaker. The downside is that the manual
bypass becomes non-functional, but otherwise it has worked
out well for me.</div>
<br>
</div>
<div>
<div dir="ltr" class="gmail_signature">
<div dir="ltr">
<div><br>
Jason Szumlanski<br>
Principal Solar Designer | Florida Solar Design Group<br>
NABCEP Certified Solar Professional (PVIP)<br>
Florida State Certified Solar Contractor CVC56956<br>
Florida Certified Electrical Contractor EC13013208<br>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
</div>
</div>
<br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Jul 23, 2026 at
9:24\u202fPM Dave Tedeyan via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</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>Hi All, </div>
<div><br>
</div>
<div>I will soon be installing one of these in a detached
shed, where it would be useful to have a light installed.
There will be no panel in there other than the GridBOSS,
inverters and batteries. The manual says that the smallest
breaker size that is supported is a 30a breaker. See table
below.</div>
<div><br>
</div>
<div>I emailed their tech support to ask if there would be a
problem with a 20a breaker. They gave a very basic answer
pointing me back to this same table, and then recommended
to add a subpanel, and then run a 20A circuit from there.
That seems a bit overkill for a light. I cannot see why if
a 30A breaker is allowed, a 20A breaker would not be
allowed. It is just a simple Eaton breaker. Am I missing
something here?</div>
<div><br>
</div>
<div>Cheers, </div>
<div>Dave</div>
<div><br>
</div>
<div><div><image (4).png></div><br>
</div>
<div><br>
</div>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature">
<div dir="ltr"><br style="color:rgb(34,34,34)">
<div dir="ltr" style="color:rgb(34,34,34)">
<div dir="ltr">
<div dir="ltr">
<table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;color:rgb(68,68,68);width:525px;font-size:11pt;font-family:Arial,sans-serif">
<tbody>
<tr>
<td width="125" valign="top" rowspan="6" style="padding:0px 10px 0px 0px;font-size:10pt;border-right:1px solid rgb(236,189,0);width:125px;vertical-align:top"><img width="96" height="95" src="https://ci3.googleusercontent.com/mail-sig/AIorK4w9B8ItkbLOVj_3kXSEToNSG4GqEc1qAkl0q-KvGLgH-Zo8UhpcOQ_YebOrq3ZUuLGNqPigeSx2_7i8"><br>
</td>
<td style="padding:0px 0px 0px 10px">
<table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;background-color:transparent">
<tbody>
<tr>
<td valign="top" style="padding:0px 0px 5px 10px;width:400px;vertical-align:top"><span style="color:rgb(236,189,0);font-size:11pt;font-weight:700">Dave
Tedeyan, P.E.<br>
</span><span style="font-size:11pt;font-weight:700"><font color="#ecbd00">Owner |
Sungineer Solar</font><br>
</span></td>
</tr>
<tr>
<td valign="top" style="padding:5px 0px 5px 10px;font-size:10pt;vertical-align:top;line-height:17px"><span style="color:rgb(236,189,0)"><span style="font-weight:700">p: </span></span><span style="font-size:10pt;color:rgb(0,0,0)">he | him | his</span><span style="color:rgb(236,189,0)"><span style="font-weight:700"><br>
a: </span></span><span style="font-size:10pt;color:rgb(0,0,0)">1653 Slaterville Rd.</span> <span style="font-size:10pt;color:rgb(0,0,0)">| Ithaca, NY 14850</span><br>
<span style="color:rgb(236,189,0)"><span style="font-weight:700">w:</span></span><a href="http://www.sungineersolar.com/" rel="noopener" style="color:rgb(51,122,183);background-color:transparent" target="_blank"><span style="font-size:10pt;color:rgb(0,0,0)"> www.sungineersolar.com</span></a><br>
<span style="color:rgb(236,189,0)"><span style="font-weight:700">c:</span></span><span style="font-size:10pt;color:rgb(0,0,0)"> (607) 270-0370</span></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
Pay optional member dues here: <a href="http://re-wrenches.org" rel="noreferrer" target="_blank">http://re-wrenches.org</a><br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br>
<br>
Change listserver email address & settings:<br>
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
There are two list archives for searching. When one doesn't
work, try the other:<br>
<a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" rel="noreferrer" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br>
<a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank">http://www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="http://www.members.re-wrenches.org" rel="noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote>
</div>
<br>
<fieldset></fieldset>
<pre>_______________________________________________
List sponsored by Redwood Alliance
Pay optional member dues here: <a href="http://re-wrenches.org" target="_blank">http://re-wrenches.org</a>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a>
Change listserver email address & settings:
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a>
There are two list archives for searching. When one doesn't work, try the other:
<a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a>
<a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a>
List rules & etiquette:
<a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">http://www.re-wrenches.org/etiquette.htm</a>
Check out or update participant bios:
<a href="http://www.members.re-wrenches.org" target="_blank">http://www.members.re-wrenches.org</a>
</pre>
</blockquote>
<pre cols="72">--
Christopher Warfel, PE
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
(401) 447-5773</pre>
</div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
Pay optional member dues here: <a href="http://re-wrenches.org" rel="noreferrer" target="_blank">http://re-wrenches.org</a><br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br>
<br>
Change listserver email address & settings:<br>
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
There are two list archives for searching. When one doesn't work, try the other:<br>
<a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" rel="noreferrer" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br>
<a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank">http://www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="http://www.members.re-wrenches.org" rel="noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote></div>
<span>_______________________________________________</span><br><span>List sponsored by Redwood Alliance</span><br><span></span><br><span>Pay optional member dues here: <a href="http://re-wrenches.org" target="_blank">http://re-wrenches.org</a></span><br><span></span><br><span>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a></span><br><span></span><br><span>Change listserver email address & settings:</span><br><span><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a></span><br><span></span><br><span>There are two list archives for searching. When one doesn't work, try the other:</span><br><span><a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a></span><br><span><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a></span><br><span></span><br><span>List rules & etiquette:</span><br><span><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">http://www.re-wrenches.org/etiquette.htm</a></span><br><span></span><br><span>Check out or update participant bios:</span><br><span><a href="http://www.members.re-wrenches.org" target="_blank">http://www.members.re-wrenches.org</a></span><br><span></span><br></div></blockquote></div></blockquote></div>