CC 12-05-2023 Item No. 8. Attachment F - Solar Array Seismic Design LetterDodd Mossa & Associates, LLC
Consulting Engineers
7490 Opportunity Rd. Suite 3500 San Diego, CA 92111
(619)260-0057
June 09, 2023
Desmond Wheatley
CEO Beam Global
5660 Eastgate Dr.
San Diego, CA 92121
(858) 799-4583
desmond.wheatley(a beamforall.com
Re: Beam Global - Solar Array Seismic Design (EV-ARC 2020)
Dear Desmond,
Based on our structural calculations preformed for the EV-ARC 2020 solar array, the
system appears to not be overstressed under the design of 160mph under the ASCE 7-
16. This wind speed is based on a nominal design speed for a 3 second gust as
prescribed in the American Society of Civil Engineers (ASCE). Calculations were been
based on an assumption of a maximum Exposure category of C, the installation location
not being atop an escarpment, or any type of hill, and with a maximum ground snow
load of Opsf based on Sunnyvale, California installation location, as a high seismic risk
region. Seismic load has been considered with a site specific Sds value of 1.2 for the
proposed installation. It should be noted that no sliding occurs against a concrete
surface, where the coefficient of friction was assumed as 0.55. Also, it should be noted
that the structure is not embedded into soil and full seismic ground motions will not
translate to the structure because of its construction type.
Please contact our office if you have any questions or concerns.
Sincerely,
ES
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Jerry Dodd, P.E.