HomeMy WebLinkAbout913 E Virginia Avenue - PlanVSE Project Number: U3211.0077.211
December 3, 2021
GC Electric Corporation, dba Electric Solar
ATTENTION: Sepehr
7950 Silverton Ave #109
San Diego, CA 92126
REFERENCE: Bryan Nih Residence: 913 East Virginia Avenue, Santa Ana, CA 92706
Solar Array Installation
To Whom It May Concern:
Per your request, we have reviewed the existing structure at the above referenced site. The purpose of our review was to
determine the adequacy of the existing structure to support the proposed installation of solar panels on the roof as shown on
the panel layout plan.
Based upon our review, we conclude that the existing structure is adequate to support the proposed solar panel installation.
Design Parameters
Code: California Residential Code, 2019 Edition (2018 IRC)
Risk Category: II
Design wind speed, Vult: 110 mph (3-sec gust)
Wind exposure category: C
Seismic design category: D
Connection to Roof
Mounting connection: (1) 5/16" lag screw w/ min. 2.5" threaded embedment into framing at max. 72" o.c. along rails
(2) rails per row of panels, evenly spaced; panel length perpendicular to the rails not to exceed 67 in. Rail cantilever shall
not exceed 50% of connection spacing.
Conclusions
Based upon our review, we conclude that the existing structure is adequate to support the proposed solar panel installation.
In the area of the solar array, other live loads will not be present or will be greatly reduced (2019 CRC, Section R324.4.1.1).
The gravity loads, and thus the stresses of the structural elements, in the area of the solar array are either decreased or
increased by no more than 5%. Therefore, the requirements of Section 503.3 of the 2019 CEBC are met and the structure is
permitted to remain unaltered.
The solar array will be flush-mounted (no more than 10" above the roof surface) and parallel to the roof surface. Thus, we
conclude that any additional wind loading on the structure related to the addition of the proposed solar array is negligible.
The attached calculations verify the capacity of the connections of the solar array to the existing roof against wind (uplift),
the governing load case. Regarding seismic loads, we conclude that any additional forces will be small. Conservatively
neglecting the weight of existing wall materials, the installation of the solar panels represents an increase in the total weight
(and resulting seismic load) of 2.5%. Because the increase in lateral forces is less than 10%, this addition meets the
requirements of the exception in Section 503.4 of the 2019 CEBC. Thus the existing lateral force resisting system is
permitted to remain unaltered.
651 W. Galena Park Blvd., Ste. 101 / Draper, UT 84020 / T (801) 990-1775 / F (801) 990-1776 / www.vectorse.com
913 E Virginia
Avenue03/11/22
VSE Project Number: U3211.0077.211
Bryan Nih Residence
12/3/2021
Limitations
Installation of the solar panels must be performed in accordance with manufacturer recommendations. All work performed
must be in accordance with accepted industry-wide methods and applicable safety standards. The contractor must notify
Vector Structural Engineering, LLC should any damage, deterioration or discrepancies between the as-built condition of the
structure and the condition described in this letter be found. Connections to existing roof framing must be staggered, except
at array ends, so as not to overload any existing structural member. The use of solar panel support span tables provided by
others is allowed only where the building type, site conditions, site-specific design parameters, and solar panel configuration
match the description of the span tables. The design of the solar panel racking (mounts, rails, etc.) and electrical engineering
is the responsibility of others. Waterproofing around the roof penetrations is the responsibility of others. Vector Structural
Engineering assumes no responsibility for improper installation of the solar array.
VECTOR STRUCTURAL ENGINEERING, LLC
12/03/2021
_______________________________________________________
Jacob Proctor, P.E.
CA License: 70567 - Expires: 06/30/2023
Project Engineer
Enclosures
JSP/joc
12/03/2021
651 W. Galena Park Blvd., Ste. 101 / Draper, UT 84020 / T (801) 990-1775 / F (801) 990-1776 / www.vectorse.com
913 E Virginia
Avenue03/11/22
JOB NO.: U3211.0077.211
SUBJECT: SEISMIC LOADS
PROJECT: Bryan Nih Residence
CHECK INCREASE IN OVERALL SEISMIC LOADS
10.2 psf
3.0 psf
8%
10.4 psf
2.5%
Conservatively neglecting the weight of existing wall materials, the installation of the solar panels represents an
increase in the total weight (and resulting seismic load) of 2.5%. Because the increase is less than 10%, this
addition meets the requirements of the exception in Section 503.4 of the 2019 CEBC. Thus the existing structure
is permitted to remain unaltered.
Addt'l Seismic Weight
Estimated Roof Dead Load
Solar Dead Load
% Roof Covered
Equiv. Total Dead Load
913 E Virginia
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JOB NO.: U3211.0077.211
SUBJECT: WIND PRESSURE
PROJECT: Bryan Nih Residence
Label: Note: Calculations per ASCE 7-10
SITE-SPECIFIC WIND PARAMETERS:
Basic Wind Speed [mph]: 110 Notes:
Exposure Category: C
Risk Category: II
Importance Factor, I:
ADDITIONAL INPUT & CALCULATIONS:
Height of Roof, h [ft]:15 (Approximate) Hip?
Comp/Cladding Location:No
Enclosure Classification:
Zone 1 GCp:0.9 Figure 30.4-2B (enter negative pressure coefficients)
Zone 2 GCp: 1.6
Zone 3 GCp: 2.5
α: 9.5 Table 26.9-1
zg [ft]: 900 Table 26.9-1
Kh: 0.85 Table 30.3-1
Kzt: 1 Equation 26.8-1
Kd: 0.85 Table 26.6-1
Velocity Pressure, qh [psf]: 22.4 Equation 30.3-1
GCpi: 0 Table 26.11-1
PRESSURES: Equation 30.9-1
Zone 1, p [psf]: 19.6 psf (1.0 W, Interior Zones, beyond 'a' from roof edge)
Zone 2, p [psf]: 35.5 psf (1.0 W, End Zones, within 'a' from roof edge)
Zone 3, p [psf]: 55.1 psf (1.0 W, Corner Zones, within 'a' from roof corner)
(a= 3 ft)
Solar Panel Array
Gable/Hip Roofs 7° < θ ≤ 27°
Enclosed Buildings
Components and Cladding Wind Calculations
()( ) pi p h GCGCqp −=
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Avenue03/11/22
JOB NO.: U3211.0077.211
SUBJECT: CONNECTION
PROJECT: Bryan Nih Residence
Calculate Uplift Forces on Connection
Pressure
(0.6 Dead -0.6 Wind)
(psf)
Max Trib. Width1
(ft)
Max Trib.
Area2
(ft2)
Max Uplift
Force
(lbs)
Zone 1 10.0 6.0 16.8 167
Zone 2 19.5 6.0 16.8 327
Zone 3 31.2 6.0 16.8 523
Calculate Connection Capacity
Lag Screw Size [in]:5/16
Cd:1.6 NDS Table 2.3.2
Embedment3 [in]:2.5
Grade:
Nominal Capacity [lbs/in]:205 NDS Table 12.2A
Number of Screws:1
Prying Coefficient:1.4
Total Capacity [lbs]:586
Determine Result
Maximum Demand [lbs]: 523
Lag Screw Capacity [lbs]: 586
Result: Capacity > Demand, Connection is adequate.
Notes
1. 'Max Trib. Width' is the width along the rails tributary to the connection.
2. 'Max Trib Area' is the product of the 'Max. Trib Width' and 1/2 the panel width/height perpendicular to the
rails. (2) rails per row of panels. Length of panels perpendicular to the rails shall not exceed 67".
SPF (G = 0.42)
3. Embedment is measured from the top of the framing member to the beginning of the tapered tip of the lag
screw. Embedment in sheathing or other material is not effective. The length of the tapered tip is not part of the
embedment length.
913 E Virginia
Avenue03/11/22
VECTOR STRUCTURAL ENGINEERS
JOB NO.: U3211.0077.211
SUBJECT: GRAVITY LOADS
PROJECT: Bryan Nih Residence
GRAVITY LOADS Roof Pitch:3.9 :12
ROOF DEAD LOAD (D)
Increase due to
pitch
Material weight
[psf]
Composite Shingles 1.05 2.0
1/2" Plywood 1.05 1.0
Framing 1.00 3.0
Insulation 1.00 0.0
1/2" Gypsum Clg.1.05 0.0
M, E & Misc 1.00 0.0
Total Existing Roof DL
PV Array DL 1.05 3
DL:1.05
ROOF LIVE LOAD (Lr)
Existing Design Roof Live Load [psf]20 ASCE 7-10 Table 4.3-1
Roof Live Load With PV Array [psf]0
SNOW LOAD (S):w/ Solar Array
Roof Slope [x:12]:3.9
Roof Slope [°]:18
Ground Snow Load, pg [psf]:0 ASCE 7-16, Section 7.2
Terrain Category:C ASCE 7-16, Table 7.3-1
Exposure of Roof:Fully Exposed ASCE 7-16, Table 7.3-1
Exposure Factor, Ce:0.9 ASCE 7-16, Table 7.3-1
Thermal Factor, Ct:1.1 ASCE 7-16, Table 7.3-2
Risk Category:II ASCE 7-16, Table 1.5-1
Importance Factor, Is:1.0 ASCE 7-16, Table 1.5-2
Flat Roof Snow Load, pf [psf]:0 ASCE 7-16, Equation 7.3-1
Minimum Roof Snow Load, pm [psf]:0 ASCE 7-16, Section 7.3.4
Unobstructed Slippery Surface?Yes ASCE 7-16, Section 7.4
Slope Factor Figure:Figure 7-2b ASCE 7-16, Section 7.4
Roof Slope Factor, Cs:0.87 ASCE 7-16, Figure 7.4-1
Sloped Roof Snow Load, ps [psf]:0 ASCE 7-16, Equation 7.4-1
Design Snow Load, S [psf]:0
1.00
0
Design material
weight [psf]
2.1
1.1
3.0
0.0
0.0
0.0
6.2
3.2
#VALUE!
2019 CRC, Section R324.4.1.1
Existing
0
3.9
18
0
C
Fully Exposed
0.9
1.1
II
1.0
0
0
No
Figure 7-2b
913 E Virginia
Avenue03/11/22
JOB NO.: U3211.0077.211
SUBJECT: LOAD COMPARISON
PROJECT: Bryan Nih Residence
Summary of Loads
Existing With PV Array
D [psf]6 9
Lr [psf]20 0
S [psf]0 0
Maximum Gravity Loads:
Existing With PV Array
(D + Lr) / Cd [psf] 21 10 ASCE 7-10, Section 2.4.1
(D + S) / Cd [psf] 7 10 ASCE 7-10, Section 2.4.1
Maximum Gravity Load [psf]: 21 10
Ratio Proposed Loading to Current Loading:49% OK
The gravity loads, and thus the stresses of the structural elements, in the area of the
solar array are either decreased or increased by no more than 5%. Therefore, the
requirements of Section 503.3 of the 2019 CEBC are met and the structure is permitted
to remain unaltered.
(Cd = Load Duration Factor = 0.9 for D, 1.15 for S, and 1.25 for Lr)
913 E Virginia
Avenue03/11/22
Vector Structural Engineering has reviewed the existing
structure with loading from the solar array and screw
connections to the existing framing. The design of the
racking system, racking connections, and all other
structural is by others. Mechanical, architectural, and all
other nonstructural aspects of the design are by others.
Electrical is by others, unless stamped by Dean Levorsen.
12/03/2021
VSE Project Number: U3211.0077.211
BLDG# 101109211
ELEC# 20175182
ISSUED 03/11/22
913 E Virginia
Avenue03/11/22
913 E Virginia
Avenue03/11/22
913 E Virginia
Avenue03/11/22
Vector Structural Engineering has reviewed the existing
structure with loading from the solar array and screw
connections to the existing framing. The design of the
racking system, racking connections, and all other
structural is by others. Mechanical, architectural, and all
other nonstructural aspects of the design are by others.
Electrical is by others, unless stamped by Dean Levorsen.
12/03/2021
VSE Project Number: U3211.0077.211
913 E Virginia
Avenue03/11/22
Vector Structural Engineering has reviewed the existing
structure with loading from the solar array and screw
connections to the existing framing. The design of the
racking system, racking connections, and all other
structural is by others. Mechanical, architectural, and all
other nonstructural aspects of the design are by others.
Electrical is by others, unless stamped by Dean Levorsen.
12/03/2021
VSE Project Number: U3211.0077.211
913 E Virginia
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Step 1: Structural Review of PV Array Mounting System
.
Step 2: Electrical Review of PV System (Calculations for Electrical Diagram)
Unirac Unirac Flashkit
624
20
31.2
6'
280
2.22
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Planset attached
913 E Virginia
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Contractor Name,
Address and Phone:
One-Line Standard Electrical Diagram
for Micro-Inverter PV Systems
Site Name:
Site Address:
System AC Size:
SIZE FSCM NO DWG NO REV
E1.1a
SCALE NTS Date: SHEET
Drawn By:
Checked By:
DESCRIPTION OR CONDUCTOR TYPE
USE-2 or PV WIRE
GEC EGC X ALL THAT APPLY
EXTERIOR CABLE LISTED W/ INV.
THWN-2 or XHHW-2 or RHW-2
GEC EGC X ALL THAT APPLY
NO DC GEC IF 690.35 SYSTEM
THWN-2 or XHHW-2 or RHW-2
GEC EGC X ALL THAT APPLY
TAG
1
2
3
4
5
CONDUIT AND CONDUCTOR SCHEDULE
COND.
GAUGE
MFG
MFG
NUMBER OF
CONDUCTORS
MFG Cable
MFG Cable
CONDUIT
TYPE
N/A
N/A
N/A
SAME
SAME
CONDUIT
SIZE
N/A
N/A
N/A
SAME
SAME
DESCRIPTION
PV DC or AC MODULE
DC/AC INVERTER (MICRO)
J-BOX (IF USED)
PV ARRAY
AC COMB. PANEL (IF USED)
GEN METER (IF USED)
AC DISCONNECT (IF USED)
SERVICE PANEL
TAG
1
2
3
4
5
6
7
8
PART NUMBER NOTES
FOR UNUSED MODULES
PUT "N/A” in BLANK ABOVE
EQUIPMENT SCHEDULE
_____
MICRO-INVERTERS
IN BRANCH-
CIRCUIT
MOD
____
DC
AC
MOD
____
DC
AC
MOD
____
DC
AC
MOD
____
DC
AC
MOD
____
DC
AC
MOD
____
DC
AC
J-BOX
AC DISCO
M
BUILDING
GROUNDING
ELECTRODE
G
M
UTILITY
SERVICE
MAIN SERVICE PANEL
MAIN
OCPD
INVERTER
OCPD
G
SEE GUIDE APPENDIX D FOR
INFORMATION ON MODULE AND
ARRAY GROUNDING
AC COMBINER
PANEL
G
____
MICRO-INVERTERS
IN BRANCH-
CIRCUIT
Planset atatched
913 E Virginia
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5
Contractor Name,
Address and Phone:
Notes for One-Line Standard Electrical
Diagram for Single-Phase PV Systems
Site Name:
Site Address:
System AC Size:
SIZE FSCM NO DWG NO REV
E1.2a
SCALE NTS Date: SHEET
Drawn By:
Checked By:
MAX POWER-POINT CURRENT (IMP)
MAX POWER-POINT VOLTAGE (VMP)
OPEN-CIRCUIT VOLTAGE (VOC)
SHORT-CIRCUIT CURRENT (ISC)
MAX SERIES FUSE (OCPD)
MAXIMUM POWER (PMAX)
MAX VOLTAGE (TYP 600VDC)
VOC TEMP COEFF (mV/oC or %/oC )
IF COEFF SUPPLIED, CIRCLE UNITS
MODULE MAKE
MODULE MODEL
PV MODULE RATINGS @ STC (Guide Section 5)
MAX DC VOLT RATING
MAX POWER @ 40oC
NOMINAL AC VOLTAGE
MAX AC CURRENT
MAX OCPD RATING
INVERTER MAKE
INVERTER MODEL
INVERTER RATINGS (Guide Section 4)
1) IF UTILITY REQUIRES A VISIBLE-BREAK SWITCH, DOES THIS SWITCH MEET THE
REQUIREMENT? YES NO N/A
2) IF GENERATION METER REQUIRED, DOES THIS METER SOCKET MEET THE
REQUIREMENT? YES NO N/A
3) SIZE PHOTOVOLTAIC POWER SOURCE (DC) CONDUCTORS BASED ON MAX
CURRENT ON NEC 690.53 SIGN OR OCPD RATING AT DISCONNECT
4) SIZE INVERTER OUTPUT CIRCUIT (AC) CONDUCTORS ACCORDING TO INVERTER
OCPD AMPERE RATING. (See Guide Section 9)
5) TOTAL OF ______ INVERTER OUTPUT CIRCUIT OCPD(s), ONE FOR EACH MICRO-
INVERTER CIRCUIT. DOES TOTAL SUPPLY BREAKERS COMPLY WITH 120% BUSBAR
EXCEPTION IN 690.64(B)(2)(a)? YES NO
NOTES FOR INVERTER CIRCUITS (Guide Section 8 and 9):
1.) LOWEST EXPECT AMBIENT TEMPERATURE BASED ON ASHRAE MINIMUM MEAN
EXTREME DRY BULB TEMPERATURE FOR ASHRAE LOCATION MOST SIMILAR TO
INSTALLATION LOCATION. LOWEST EXPECTED AMBIENT TEMP ____oC
2.) HIGHEST CONTINUOUS AMBIENT TEMPERATURE BASED ON ASHRAE HIGHEST
MONTH 2% DRY BULB TEMPERATURE FOR ASHRAE LOCATION MOST SIMILAR TO
INSTALLATION LOCATION. HIGHEST CONTINUOUS TEMPERATURE ____oC
2.) 2009 ASHRAE FUNDAMENTALS 2% DESIGN TEMPERATURES DO NOT EXCEED
47oC IN THE UNITED STATES (PALM SPRINGS, CA IS 44.1 oC). FOR LESS THAN 9
CURRENT-CARRYING CONDUCTORS IN ROOF-MOUNTED SUNLIT CONDUIT AT
LEAST 0.5" ABOVE ROOF AND USING THE OUTDOOR DESIGN TEMPERATURE OF
47oC OR LESS (ALL OF UNITED STATES),
a) 12 AWG, 90 oC CONDUCTORS ARE GENERALLY ACCEPTABLE FOR MODULES
WITH Isc OF 7.68 AMPS OR LESS WHEN PROTECTED BY A 12-AMP OR SMALLER
FUSE.
b) 10 AWG, 90oC CONDUCTORS ARE GENERALLY ACCEPTABLE FOR MODULES
WITH Isc OF 9.6 AMPS OR LESS WHEN PROTECTED BY A 15-AMP OR SMALLER
FUSE.
NOTES FOR ARRAY CIRCUIT WIRING (Guide Section 6 and 8 and Appendix E):
OCPD = OVERCURRENT PROTECTION DEVICE
NATIONAL ELECTRICAL CODE®REFERENCES
SHOWN AS (NEC XXX.XX)
NOTES FOR ALL DRAWINGS:
SIGNSSEE GUIDE SECTION 7
SIGN FOR DC DISCONNECT
SIGN FOR INVERTER OCPD AND AC
DISCONNECT (IF USED)
No sign necessary since 690.51
marking on PV module covers
needed information
AC OUTPUT CURRENT
NOMINAL AC VOLTAGE
SOLAR PV SYSTEM
AC POINT OF CONNECTION
THIS PANEL FED BY MULTIPLE
SOURCES (UTILITY AND SOLAR)
Planset atatched
Panasonic
Evervolt 370W
9.90
37.4
44.1
10.55
370
25
1000
-0.24
Enphase
IQ7Plus
60
295
240
1
16.94
120/240
14
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Rev: 7/15/2021
RESIDENTIAL
PHOTOVOLTAIC
CHECKLIST
SOL-01 CBC 2019
Solar Photovoltaic (PV) Checklist for Detached SINGLE FAMILY RESIDENCES Only
Instructions: The licensed contractor of record shall complete all sections, answer the ten questions and
sign the certification section below. A copy of this form shall be attached to each of TWO sets of plans, of
minimum 11” x 17” size. If answering NO to any of the questions, plan check shall be required.
Project Address:
Contractor Company Name:
Contractor License Number:
YES NO Are the following applicable to the proposed project?
1. Will the PV system layout provide the required three-foot wide clear access pathways
per Section 605.11 of the California Fire Code, and is this shown on the roof plan?
2. Will the PV system be installed on a roof having only one roofing layer with no
overlays?
3. Will the PV array be flush mounted to the existing roof so that the plane of the
modules (panels) are parallel to the plane of the roof?
4. Will the PV system weigh maximum 4 pounds per square feet or less?
5. Will the PV system be installed where the modules do not overhang any roof edges
(such as eaves, gabled ends, ridges and hips)?
6. Will the PV system be installed with a space of 2” minimum to 10” maximum between
the underside of modules and the surface of the roof?
7. Will the PV system be installed without using any ballast system or counter-weight
system?
8. Will the anchors be installed with a maximum horizontal anchor spacing of 6 feet
and is this maximum horizontal spacing shown on the plans?
9. Will the minimum 5/16” lag screws be installed with a minimum of 2-1/2 inch
embedment into roof rafters (with pre-drilled holes) and is this minimum embedment
shown on the plans?
10. Are ALL the structural pages of the plans stamped and signed by a California
licensed professional engineer? (including project specific site plan, PV layout,
anchorage spacing, anchorage details and manufacturer’s PV support information.)
I certify under penalty of perjury under the laws of the State of California that the above is true:
Print Name: Signature:
Phone Number: Date:
Email Address:
Planning & Building Agency
Building Safety Division
20 Civic Center Plaza
P.O. Box 1988 (M-19)
Santa Ana, CA 92702
(714) 647-5800
www.santa-ana.org
913 E. Virginia Ave, Santa Ana CA 92706
G C Electric Solar
995108
sepehr nozari
8589993929 12/17/2021
sepehr@usa-gce.com
913 E Virginia
Avenue03/11/22