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Project : <br />Project Number : <br />By : <br />Date : <br />UNIRAC <br />1411 Broadway Blvd, NE <br />Albuquerque, NM 87102 <br />RE: Battery Installation at 3117 S Pacific Ave, Santa Ana, CA 92704, USA <br />To Whom it May Concern, <br />CODE REFERENCES: <br />BUILDING CODE: 2022 CALIFORNIA BUILDING CODE <br />2021 INTERNATIONAL BUILDING CODE <br />ASCE 7-16 <br />SCOPE OF WORK: <br />DESIGN PARAMETERS <br />SDS : g <br />Enphase IQ Battery 5P :lbs <br />EXISTING STRUCTURE <br />WALL : 2x4 Stud Wall @ 16" O.C. <br />CONNECTION TO STRUCTURE <br />MOUNTING CONNECTION : <br />OBSERVED CONDITIONS: <br />Praneet R Erusu, P.E. <br />Principal Engineer <br />Erusu Consultants US Inc. <br />Allen Jensen <br />PE <br />04-29-2025 <br />29 April 2025 <br />The observed roof framing is described below. If field conditions differ, the contractor shall notify the engineer <br />prior to starting construction. The stud wall framing is supported by 2x4 wood stud @ 16" O.C. The maximum <br />allowed height of wall is 10ft, to be verified in field by the contractor. <br />Per your request, we have reviewed the connection of battery to existing wall. The purpose of our review was to <br />determine the adequacy of connection to the existing stud wall to support the proposed battery on wall. <br />The structural review that follows, including plans and calculations, only apply to the section of the wall that is <br />directly supporting the battery system and its supporting elements. <br />174 <br />1.029 <br />FOR BOTTOM MOUNTING BRACKET: (3) 5/16" LAG SCREWS w/ MIN. 2.5" <br />EMBEDMENT INTO (E) STUD (ON THE CENTERLINE), USING 1 STUD <br />MINIMUM FOR BATTERY SINGLE STACK <br />FOR TOP SHEID: (6) 1/4" LAG SCREWS w/ MIN. 2.5" EMBEDMENT INTO (E) <br />STUDS/STUD WALL (HEAD THICKNESS < 5 MM [0.2 INCH] <br />29 Apr 2025 <br />EXP : 30 Sep 2025 <br />Page 1