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Back in the day, the old used Carrizo "Super Gold" 105W modules would do about 6 amps normally, but 10A plus on a cold Indiana day. </div>
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I had 12V customers with 4 of these blowing 40A fuses.</div>
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But that was years ago, in a different world.</div>
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<b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> on behalf of Drake Chamberlin via RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Sent:</b> Monday, May 18, 2026 9:09 AM<br>
<b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Cc:</b> drake.chamberlin@redwoodalliance.org <drake.chamberlin@redwoodalliance.org><br>
<b>Subject:</b> [RE-wrenches] 1.56 Rule </div>
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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>
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<div style="margin: 0px; font-family: monospace; font-size: 10pt;">The multiplier of 1.25 for a continuous load is relevant for sure. To multiply again by another 1.25 seems excessive.</div>
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<div style="font-family: monospace; font-size: 10pt;">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>
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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>
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Thanks,</div>
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Drake </div>
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<p style="margin: 1em 0px;"><span style="font-family: monospace; font-size: 10pt;"><i>Drake Chamberlin</i></span></p>
<p style="margin: 1em 0px;"><span style="font-family: monospace; font-size: 10pt;"><i>Athens Electric LLC</i></span></p>
<p style="margin: 1em 0px;"><span style="font-family: monospace; font-size: 10pt;"><i>Ohio Electrical Contractor’s License 44810</i></span></p>
<p style="margin: 1em 0px;"><span style="font-family: monospace; font-size: 10pt;"><i>NABCEP Certified PV Installation Professional</i></span></p>
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--<br>
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