<div dir="ltr" gmail_original="1"><div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">I have had AHJs try to shoehorn solar panels into the mechanical code before. I think your best bet is to argue the applicability of the mechanical code entirely. Expressio unius est exclusio alterius / The expression of one thing implies the exclusion of others. If the IRC authors wanted M1307.3 to apply to ESS, they would have said so in R328.</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 would go with something like:</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;">This equipment is a UL 9540-listed energy storage system, specifically tested to the UL 9540A standard. The applicable section of the IRC is R328 (or 2023 IRC Section 327), not the mechanical code. Chapter 13 applies to mechanical appliances such as HVAC equipment or combustion devices—not sealed electrical ESS. This product does not fall under the scope of M1301.1 and is not subject to M1307.3.</div><br></div><div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">If they don't accept that, I would ask them to:</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;">Point to the section in M1301.1 that covers ESS. Explain why R328 doesn’t apply, despite being specifically titled “Energy Storage Systems.”</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;"><br></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;">On another subject, I have been involved in another AHJ battle regarding protection against vehicular traffic, and I have a blog post on the subject coming out soon. Fortunately, the next Florida Building Code draft mirrors the IRC, which includes a clear schematic that clarifies the requirements. </div><br></div><div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">Good luck, and don't let them win!</div><br></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><br>Jason Szumlanski<div><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Principal Solar Designer | Florida Solar Design Group</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">NABCEP Certified Solar Professional (PVIP)</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Florida State Certified Solar Contractor CVC56956</span></div><div><font color="#333333" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif">Florida Certified Electrical Contractor EC13013208</font></div></div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Sep 9, 2025 at 3:46 PM scot.arey--- via RE-wrenches <re-wrenches@lists.re-wrenches.org> 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 class="msg1582706920824597941">
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Seeking your suggestions and direction. My AHJ - after acknowledging that the Enphase 5p battery has a floor mount option - now insists that it must be 18-inches above the garage floor unless I can produce something that says it is "Flammable Vapor Ignition
Resistant."<br>
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We all know there is no open flame from an ESS and I know the 9540A depicts a battery at 6-inches.<br>
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Anybody run into this and have suggestions on what I might show back to the AHJ?</div>
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<b>Howard "Scot" Arey</b></div>
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<b>Owner, Solar CenTex</b></div>
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NABCEP PV Installation Professional</div>
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TECL 29755</div>
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