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<p>If you use 100% duty rated breakers such as breakers sold my
Midnite, you can ignore the 1.25 multiplier for continuous duty. </p>
<p>Ray Walters<br>
Remote Solar</p>
<div class="moz-cite-prefix">On 5/18/2026 8:27 AM, Dave Tedeyan via
RE-wrenches wrote:<br>
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<div>I agree with David. I think the first 1.25 is for
continuous use, and the second is for when irradiance is
higher than the standard 1000w/m2. I've also seen irradiance
around 1200 in cloudy central NY.</div>
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<div dir="ltr" class="gmail_attr">On Mon, May 18, 2026,
3:36 PM David Quattro via RE-wrenches <<a
href="mailto:re-wrenches@lists.re-wrenches.org"
moz-do-not-send="true" class="moz-txt-link-freetext">re-wrenches@lists.re-wrenches.org</a>>
wrote:<br>
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<div dir="auto">The standard assumed irradiance for math
purposes has always been 1000W/m2. I’ve seen days where
base-line was 1200 on my Daystar meter, and elevation
was barely above sea level, say 500ft, max 1000ft. I
imagine Edge of cloud effect on a day like that could
send the current as high as 1.56</div>
<div dir="auto">David</div>
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<div dir="ltr" class="gmail_attr">On Mon, May 18, 2026
at 6:24 AM Dana Orzel via RE-wrenches <<a
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wrote:<br>
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<p class="MsoNormal"><span
style="font-size:14pt;font-family:"Century Gothic",sans-serif">VERY
High elevation 10,000’+ , with high wind
& very low temps. Not normal
installation definitely a “Special”
situation. I agree in 95% of installations
1.56 is an excessive.</span></p>
<p class="MsoNormal"><span
style="font-size:14pt;font-family:"Century Gothic",sans-serif"> </span></p>
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From: Drake Chamberlin via RE-wrenches <<a
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Bcc: <br>
Date: Mon, 18 May 2026 13:09:27 +0000<br>
Subject: [RE-wrenches] 1.56 Rule<br>
<div
style="font-size:10pt;font-family:Verdana,Geneva,sans-serif">
<div
style="margin:0px;padding:0px;font-family:monospace"><br>
The logic of this rule for calculating PV
amperage seems a little off to me. - It is a
calculation that is set in stone as a bedrock
truth of the solar industry. (1.25 X 1.25 =
1.56).</div>
<div
style="margin:0px;padding:0px;font-family:monospace"> </div>
<div
style="margin:0px;padding:0px;font-family:monospace">The multiplier of
1.25 for a continuous load is relevant for sure.
To multiply again by another 1.25 seems
excessive.</div>
<div
style="margin:0px;padding:0px;font-family:monospace">
<div style="font-family:monospace"> </div>
<div
id="m_7198349781701852366m_3148561063270621487signature"
style="font-family:monospace">Although it is
certainly true that modules put out
considerably more power when it is cold out,
in my experience that is almost all due to the
increase in voltage. The amperage goes up a
little, but no where near 25%. </div>
<div style="font-family:monospace"> </div>
<div style="font-family:monospace">Just because
I haven't seen it doesn't mean it can't
happen. Are there circumstances where the
amperage of a PV module can go up by 25%? </div>
<div style="font-family:monospace"> </div>
<div style="font-family:monospace">Thanks,</div>
<div style="font-family:monospace"> </div>
<div style="font-family:monospace">Drake </div>
<div style="font-family:monospace"> </div>
<div style="font-family:monospace">
<p style="font-family:monospace"><em
style="font-family:monospace">Drake
Chamberlin</em></p>
<p style="font-family:monospace"><em
style="font-family:monospace">Athens
Electric LLC</em></p>
<p style="font-family:monospace"><em
style="font-family:monospace">Ohio
Electrical Contractor’s License 44810</em></p>
<p style="font-family:monospace"><em
style="font-family:monospace">NABCEP
Certified PV Installation Professional</em></p>
</div>
<div style="font-family:monospace">-- <br>
<div
style="margin:0px;padding:0px;font-family:monospace"> </div>
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