4 ABERDEEN ST - BPA-14-1505 SOLAR PANELS 30Y
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q The Commonwealth of Massachusetts (YI4 SEPCITb OF" �� 0
1' Board of Building Regulations and Standards t 1
Massachusetts State Building Code,780 CMR = � SALEM
_ Revised.Mar 2011
Building Permit Application To Construct,Repair, Renovate Or Demolish
One-or Two-Family Dwelling is
This Section For Official Use Only
Building Permit Number: Date pp feed: p
Building Official(Print Name) Signature > Date
SECTION l:SITE INFORMATION
1.1 Property.Q dress: pn 1^ ,L.- 1.2 Assessors Map&Parcel Numbers
L la Is this an accepted street?yes x no Map Number Parcel Number
1.3 Zoning Information: 1.4 Property Dimensions:
Zoning District Proposed Use Lot Area(sq R) Frontage(it)
1.5 Building Setbacks(B)
Front Yard Side Yards Rear Yard
Required Provided Required Provided Required Provided
1.6 Water Supply:(M.G.L c.40,§54) 1.7 Flood Zone Information: 1.8 Sewage Disposal System:
Public❑ Private❑ Zone: _ Outside Flood Zone?
Check if yes❑ Municipal❑ On site disposal system ❑
SECTION 2: PROPERTY OWNERSHIP'
2.1 Owner'of Record: Scott Austin 50112 W1 IA IN,
Name(Print) City,Slate,ZIP
4 Aberdeen st, 978-821 -0583 Austinkirsten@yahoo.com
No.and Street Telephone Email Address
SECTION 3:DESCRIPTION OF PROPOSED WORK'(check all that apply)
New Construction b(I Existing Building❑ Owner-Occupied ❑ Repairs(s) ❑ Alteration(s) ❑ 1 Addition ❑
Demolition ❑ 1 Accessory Bldg.❑ Number of Units_ Other ❑ Specify:
Brief Description of Proposed Work': S
V QIC. So(0.r
SECTION 4:ESTIMATED CONSTRUCTION COSTS
Item Estimated Costs:
Labor and Materials Official Use Only
1.Building $1—ISO-(D'O 1. Building Permit Fee:$ Indicate how fee is determined:
2.Electrical ❑Standard City/Town Application Fee
$ 2�(p-Oa
❑Total Project Cost'(Item 6)x multiplier x
3.Plumbing $ 2. Other Fees: $
4. Mechanical (HVAC) $ List:
5.Mechanical (Fire $
Suppression) Total All Fees:$
Check No._Check Amount: Cash Amount:_
6.Total Project Cost: $�{7v,Zs6- ❑Paid in Full 0 Outstanding Balance Due:
SECTION 5: CONSTRUCTION SERVICES q
5.11-Construction Supervisor License(CSL) OL�5; 54 � 2g
-1LLYAe,S ��Py'L'V�C1.Xl License Number Expiration ate
Name of CSL Holder
-1 1 I cui/) S-iYeeL List CSL'I'ype(see below) U
No.and Street l!11C L 'type Description
SQ 1..IL (>S U Unrestricted(Buildings up to 35,000 cu.ft.
R Restricted 1&2 FamilyDwelling
City/Town,S tc,'LIP M Mason
ED
Rooftn CoverinWindow and Sidin', �� Solid Fuel Burning Appliances
V jVly 11 syUR,l! Insulation
Email address rr'1 Demolition
5.2 Registered Home Improvement Contractor(HIC)
ALMU t Sfllar[�2velo eY 1 l C ` 'o 1
HIC Registration Number E pirat on Date
HIC Cotnp�ny Name or HIC RSgistrant Name
4 . I N. 3 0� W . Yy�CLS0IL1 r c�V L V lt'L'FSo Ltr.
No.and Street Email address C-DM
pro no Ur $4tooq -1S'13D53DLpS
City/Town,State,ZIP Tele hone
SECTION 6:WORKERS'COMPENSATION INSURANCE AFFIDAVIT(M.G.L.c.152.§ 25C(6))
Workers Compensation Insurance affidavit must be completed and submitted with this application. Failure to provide
this affidavit will result in the denial of the Issuance of the building permit.
Signed Affidavit Attached? Yes .........-A No-.........❑
SECTION 7a:OWNER AUTHORIZATION TO BE COMPLETED WHEN
OWNER'S AGENT OR CONTRACTOR APPLIES FOR BUILDING PERMIT
1,as Owner of the subject property,hereby authorize Vlv 1lt S9 10-1 '
to act on my beh#M in all matters relative to work authorized by this building permit application.
qr � 9/8/14
Pnnt Owner' a e :.ectronie Signature) Date
SECTION 7b:OWNER` OR AUTHORIZED AGENT DECLARATION
By entering my name below, I hereby attest under the pains and penalties of perjury that all of the information
contained in th' p lion is true and accurate to the best of my knowledge and understanding. /\ /
Print Ow s r r'rzed Agent's Name(Electronic Signature) Date
NOTES:
I. An Owner who obtains a building permit to do his/her own work,or an owner who hires an unregistered contractor
(not registered in the Home Improvement Contractor(HIC)Program),will not have access to the arbitration
program or guaranty fund under M.G.L.c. 142A.Other important information on the HIC Program can be found at
www.mass.gov/oca Information on the Construction Supervisor License can be found at www.mass.aov/dos
2. When substantial work is planned,provide the information below:
Total floor area(sq.ft.) (including garage, finished basement/attics,decks or porch)
Gross living area(sq,ft.) Habitable room count
Number of fireplaces Number of bedrooms
Number of bathrooms Number of half/baths
Type of healing system Number of decks/porches
Type of cooling system Enclosed Open
3. "Total Project Square Footage"may be substituted for"Total Project Cost"
vivint. solar 4931 North 300 West
Structural Group Provo,UT84604
P: (801)234-7050
Scott E. Wyssling, PE
Head of Structural Engineering scott.wyssling@vivintsolar.com
August 16,2014
Mr. Dan Rock, Project Manager
Vivint Solar
24 Normac Road
Woburn MA 01801
Re: Structural Engineering Services
Austin Residence
4 Aberdeen Street, Salem MA
AR#3217667
8.750 kW System
Dear Mr. Rock:
Pursuant to your request, we have reviewed the following information regarding solar panel installation on
the roof of the above referenced home:
1. Site VisiWerification Form prepared by a Vivint Solar representative identifying specific
site information including size and spacing of trusses for the existing roof structure.
2. Design drawings of the proposed system including a site plan, roof plan and connection
details for the solar panels. This information was prepared by the Design Group and will
be utilized for approval and construction of the proposed system.
3. Photovoltaic Rooftop Solar System Permit Submittal prepared identifying design
parameters for the solar system.
4. Photographs of the interior and exterior of the roof system identifying existing structural
members and their conditions.
Based on the above information we have evaluated the structural capacity of the existing roof system to
support the additional loads imposed by the solar panels and have the following comments related to our
review and evaluation:
Description of Residence:
The existing residence is typical wood framing construction with the roof system consisting of truss system
with all chords constructed of 2 x 4 dimensional lumber at 24"on center. The attic space is unfinished and
photos indicate that there was free access to visually inspect the size and condition of the roof rafters. All
wood material utilized for the roof system is assumed to be Spruce-Pine-Fir #2 or better with standard
construction components. Our review of the photos of the exterior roof does not indicate any signs of
settlement or misalignment caused by overstressed underlying members.
Stability Evaluation:
A. Wind Uplift Loading
1. Refer to attached Ecolibrium Solar calculations sheet for ASCE/SEI 7-10 Minimum Design Loads
for Buildings and other Structures, wind speed of 100 mph based on Exposure Category"B" and
17 and 18 degree roof slopes on the dwelling areas. Ground snow load is 40 PSF for Exposure
"B", Zone 2 per(ASCE/SE17-10).
2. Total area subject to wind uplift is calculated for the Interior, Edge and Corner Zones of the
dwelling.
bibint. 3;) ;' C' I}
Page 2 of 2
B. Loading Criteria
• 10 PSF= Dead Load roofing/framing 40 PSF= Live Load (ground snow load)
• 5 PSF= Dead Load solar panels/mounting hardware
Total Dead Load=15 PSF
The above values are within acceptable limits of recognized industry standards for similar structures and
in accordance with the 2012 International Residential Code. Analysis performed of the existing roof
structure utilizing the above loading criteria indicates that the existing truss system will support the
additional panel loading without damage, if installed correctly.
C. Roof Structure Capacity
1. The photographs provided of the attic space and truss system show that the framing is in good
condition with no visible signs of damage caused by prior overstressing.
D. Solar Panel Anchorage
1. The solar panels shall be mounted in accordance with the most recent "Ecolibrium Solar
Installation Manual', which can be found on the Ecolibrium Solar website (ecolibriumsolar.com).
If during solar panel installation, the roof framing members appear unstable or deflect non-
uniformly, our office should be notified before proceeding with the installation.
2. Maximum allowable pullout per lag screw is 235 Ibs/inch of penetration as identified in the
National Design Standards (NDS) of timber construction specifications for Hem-Fir (North
Lumber) assumed. Based on our evaluation, the pullout value, utilizing a penetration depth of 2
'/z', is less than what is allowable per connection and therefore is adequate. Based on the
variable factors for the existing roof framing and installation tolerances, using a thread depth of 2
112" with a minimum size of 5/16" lag screw per attachment point for panel anchor mounts should
be adequate with a sufficient factor of safety.
3. Considering the roof slopes, the size, spacing, condition of roof, the panel supports shall be
placed at and attached to no greater than the panel length when installed parallel to the trusses
(portrait). No panel supports spacing perpendicular to the trusses shall be greater than two (2)
trusses or 48"o/c, whichever is less.
4. Panel supports connections shall be staggered to distribute load to adjacent trusses.
Based on the above evaluation, it is the opinion of this office that with appropriate panel anchors being
utilized the roof system will adequately support the additional loading imposed by the solar panels. This
evaluation is in conformance with the 2012 International Residential Code, current industry standards and
practice,and based on information supplied to us at the time of this report.
Should you have any questions regarding the above or if you require further information do not hesitate to
contact me.
Ve truly yours, E
naq
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-V L III�� I -�
CIVI y
Scott E. Wyss PE o w
MA License No.505 qOF FCISTEPe
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MODULE DETAIL mvener MaFelMmel Enpeana M215-ao-2U.-Si Tag oaempr n wim Gauge xofconavdom Conduit Type Cannot size
Max DC Volt Rating 411 Vol6
Max Power @40°C 315 WatR 1 Opinion engage cable-THAN-2 RFWG 4 Loul N/A-Free Nr /��
Nominal AC Voltage b0 VdLs 1 Bare Copper Ground(EGL/GEC) BAWG 1 NIA-Free Air N/A-Tom am ,W`
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NOTES POR INVERTER CIRCUITS(Guide Section 8 and 9): 3 THWN-2-Gmim BRAG 1 PVG 0'-1- •�inmw
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MICROINVERTER CONNECTION RATING AT DISCONNECT. Maximum Byslem Vale, +000(IECY600(UL) < 1-
TO ENGAGE TRUNK CABLE 4.)SIZE INVERTER OUTPUT(AC)CONDUCTORS ACCORDING Von Temperature CoeR¢rem -r I., %PC
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PV CIRCUIT.GOES TOTAL SUPPLY BREAKERS COMPLY
WITH 120%BUSBAR EXCEPTION IN 1.)Lowest expected ambient temperature based on ASHRAE minimum mean extreme
#6 BARE CU GROUND NEC690.64(B)(2)(a)? RYES NO cry,bulb temperature Mr ASHRAE location most similar to installation location: -19°C
(GROUNDING ARRAV) Signs(See Guide Section 7) temperature
continuous ASHRAE M1ion: 39-C month 2%dry bulb
temperature far ASHRAE location most similar to installation location: 39°C
Sign for inverter OCPD and AC Disconnect: 3.)2005 ASHRAE fundamental.2%design temperatures do not..road 47-C in the
United States(Palm Springs,CA is 44.1°C).For less than 9 curren-c InrAng Conductors t
Solar PV System AC Point of Connection in mnf_mnttnted sunlit conduit at east as•above roof and using the outdoor design _
AG Output Current 31.500000 Amps temperature of 47°C or less(all of United States). _ v
Nominal AC Voltage 240 Volta a.)12 AWG,90°C conductors are generally acceptable for modules with led of 7,68 Amps •IV1_�
PV CIRCUIT 1: 17 MODULES/PARALLEL or less when protected by a 12-Amp or smaller fuse. m
THIS PANEL FED BAND PLE SOI-AR)SOURCES o)10 AWG,90°C commandeers are generally acceptable for modules with lse of 9.6 Amps
(UTILITY AND SOLAR) or less when protectedb a I 5-Amp or smaller fuse. •�
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ALL INVERTER OUTPUT CIRCUITS WILL HAVE A NEUTRAL CONDUCTOR 05
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Vivint Solar - PV Solar Rooftop System Permit Submittal
1. Proiect Information
Project Name: Scott Austin
Project Address: 4 Aberdeen St,Salem MA
A. System Description:
The array consists of a 8.75 kW DC roof-mounted Photovoltaic power system operating in parallel with the utility grid.There are(35)
250-watt modules and(35) 215-watt micro-inverters,mounted on the back of each PV module.The array includes(3)PV circuit(s).The
array is mounted to the roof using the engineered racking solution from Ecolibrium Solar.
B.Site Design Temperature: (From Boston Logan INT'L ARPT weather station)
Average low temperature: -21.1 °C (-5.98'F)
Average high temperature: 38.4°C (101.12°F)
C. Minimum Design Loads:
Ground Snow Load: 40 psf (State Board BR&S)
Design Wind Speed: 100 mph (State Board BR&S)
2. Structural Review of PV Array Mounting SVstem:
A.System Description:
1.Roof type: Comp.Shingle
2.Method and type of weatherproofing roof penetrations: Flashing
B. Mounting System Information:
1.Mounting system is an engineered product designed to mount PV modules
2.For manufactured mounting systems,following information applies:
a.Mounting System Manufacturer: Ecolibrium Solar
b.Product Name: Ecorail
c.Total Weight of PV Modules and mounting hardware: 1505 Ibs
d.Total number of attachment points: 71
e.Weight per attachment point: 21.19 Ibs
E Maximum spacing between attachment points: * See attached engineering talcs
g.Total surface area of PV array: 616.35 square feet
h. Array pounds per square foot: 2.44 Ibs/square foot
i.Distributed weight of PV array on roof sections:
-Roof section 1: (27)modules,(32)attachments 22.32 pounds
-Roof section 2: (8)modules,(19)attachments 18.1 pounds per square foot
3. Electrical Components:
A.Module (UL 1703 Listed) Qty
Trina TSM 250-PA05.18 35 modules
Modulg Sixes
Pmax-nominal maximum power at STC - 250 watts
Vmp-rated voltage at maximum power - 30.3 volts
Voc-rated open-circuit voltage - 37.6 volts
Imp-rated current at maximum power - 8.27 amps
Ise-rate short circuit current - 8.85 amps
B.Inverter (UL 1741 listed) Qty
Enphase M215-60-21J--S22 35 inverters
Inverter Specs
1. Input Data(DC in)
Recommended input power(DC) - 260 watts
Max.input DC Voltage - 45 volts
Peak power tracking voltage - 22V-36V
Min./Max. start voltage - 22V/45V
Max.DC short circuit current - 15 amps
Max.input current - 10.5 amps
2. Output Data(AC Out)
Max.output power - 215 watts
Nominal output current - 0.9 amps
Nominal voltage - 240 volts
Max.units per PV circuit - 17 micro-inverters
Max.OCPD rating - 20 amp circuit breaker
C.System Configuration
Number of PV circuits 3
PV circuit t - 17 modules/inverters (20) amp breaker
PV circuit 2 - 10 modules/inverters (15) amp breaker
PV circuit 3 - 8 modules/inverters (15)amp breaker
2011 NEC Article 705.60(B)
vivint. �t� r
D.Electrical Calculations
1.PV Circuit current
PV circuit nominal current 15.3 amps
Continuous current adjustment factor 125% 2011 NEC Amde 705.60(B)
PV circuit continuous current rating 19.125 amps
2.Overcurrent protection device rating
PV circuit continuous current rating 19.125 amps
Next standard size fuse/breaker to protect conductors 20 amp breaker
Use 20 amo AC rated fuse or breaker
3.Conductor conditions of use adjustment(conductor ampacity derate)
a.Temperature adder
Average high temperature 38A°C (101.12°F)
Conduit is installed 1"above the roof surface Add 22°C to ambient 2011 NEC Arrde 705.60(B)
Adjusted maximum ambient temperature 60.4°C (140.72°F)
b.PV Circuit current adjustment for new ambient temperature
Derate factor for 60.4°C (f40.72-F) 71% 2011 NEC Article 705.60(B)
Adjusted PV circuit continuous current 26.9 amps
c.PV Circuit current adjustment for conduit fill
Number of current-carrying conductors 9 conductors
Conduit fill derate factor 700/4 2011 NFC Article 705.60(B)
Final Adjusted PV circuit continuous current 38.4 amps
Total derated ampacity for PV circuit 38.4 amps
Conductors(tag2 on 1-line)must be rated for a minimum of 38.4 amps
THWN-2(90°C) #lOAWG conductor is rated for 40 amps (Use#lOAWG or larger) 2011 NEC Article 705.60(B)
4.Voltage drop(keep below 3%total)
2 parts.
1.Voltage drop across longest PV circuit micro-inverters(from modules to j-box)
2.Voltage drop across AC conductors(from j-box to point of interconnection)
1.Mirco-inverter voltage drop: 0.48%
The largest number of micro-inverters in a row in the entire array is 10 inCircuit 2.According to
manufacturer's specifications this equals a voltage drop of 0.48%.
2.AC conductor voltage drop:
=I x R x D C 240 x 100 to convert to percent)
_ (Nominal current of largest circuit) x(Resistance of#10AWG copper) x(Total wire mn)
Total system voltage drop: #
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