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<p>I've got some old systems running the QO breakers at 48 v
nominal, but the Voc of the array could be over 80. Never an
issue, but I agree just swap out that load center, since its that
old. Midnite has good stuff. If you're just running to a an FM80
or similar with 150 v limit, their regular breakers are 150 vdc
rated. I only use the 300 v rated breakers with the new FM 100
that can take 300 vdc. <br>
</p>
<p>Ray Walters<br>
Remote Solar<br>
</p>
<div class="moz-cite-prefix">On 10/25/2021 6:45 PM, Chris Sparadeo
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAAdbmLa84KL2-cg6hzxSAMvQJXMANJeiQLY+BFZPEeYL26ZqVA@mail.gmail.com">
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<div dir="auto">Hi Jeremy,</div>
<div dir="auto"><br>
</div>
<div dir="auto">According to the QO cut sheet the answer is
48VDC:</div>
<div dir="auto"><br>
</div>
<div dir="auto"><a
href="https://download.schneider-electric.com/files?p_Doc_Ref=0730CT9801"
moz-do-not-send="true" class="moz-txt-link-freetext">https://download.schneider-electric.com/files?p_Doc_Ref=0730CT9801</a></div>
<br>
</div>
<div dir="auto">My guess is that your string voltage would be much
greater than that. Not sure your exact application, but for the
slight added cost, I would definitely suggest using a reputable
NEMA3R combiner/disco with 300VDC breakers and throwing away the
ancient load center. </div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div><br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Oct 25, 2021 at 8:30
PM Jeremy Rodriguez <<a
href="mailto:allsolarjeremy@msn.com"
moz-do-not-send="true" class="moz-txt-link-freetext">allsolarjeremy@msn.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)">
<div dir="auto">
<div>Hello </div>
<div>Does anyone have a definitive answer to the DC rating
of the QO circuit breakers? I\u2019ve got a potential
client with an existing AC load center (>20 yrs)
being used for his array combiner. </div>
<div>He\u2019s looking to add to the array, with modules that
are higher voltage of course. </div>
<div>Thanks in advance. </div>
<br>
<div dir="ltr">Jeremy Rodriguez
<div>Solar Installation / <span style="font-size:13pt">Design
Expert </span></div>
<div>
<div>All Solar, Inc.
<div>1453 M St<br>
<div>Penrose Colorado 81240</div>
<div><br>
</div>
<div>Sent by Jeremy's iPhone. Sorry for typos and
shorthand. </div>
</div>
</div>
</div>
</div>
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<div>Chris Sparadeo</div>
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<div>C_802-369-4458</div>
<div>H_802-728-3059</div>
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