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Collector Mounting

Roof Penetrations

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Large roof mounted systemUniversity of Wisconsin

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COLLECTOR POSITIONING

SOUTH ORIENTATION– 30-45 DEGREE EITHER EAST OR WEST OF DUE

SOUTH SATISFACTORYLATITUDE – +15 FOR WINTER– - 15 FOR SUMMER

ROOF AESTHETICSPIPE RUN BETWEEN COLLECTOR AND TANK– 100 FEET MAXIMUM

PROPER DRAINAGE FOR COLLECTOR AND LINES

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Collector Positioning

South Orientation– 30-45 Degree Either East Or West Of Due South

SatisfactoryTilt of Collector is Typically Latitude – +15 For Winter– - 15 For Summer

Roof Aesthetics is important to the customerPipe Run Between Collector And Tank– 100 Feet Maximum (as a rule, could be longer)

Proper Drainage For Collector And Lines for Direct and Drain Back Systems

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Roof Mounting

Rack Mounting– Pre-built Structural Frame– Not Common

Standoff Mounting– Standoffs Separate Collector From Roof– Allow Leaves, Water, Etc To Pass Between Collector

And Roof– Allows For Mounting The Collector At Various Slopes– Most Common Method Used

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WIND LOADING

WIND LOAD RESISTANCE– INTERMITTENT WIND LOADS OF 130 MPH

COLLECTOR PLACEMENT– AWAY FROM RIDGES– PARALLEL TO ROOF PLANE

COLLECTOR ANCHORS AND FASTENERS WIND LOAD– MAY REQUIRE SPECIFIC PE EVALUATION

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WIND LOADING-COLLECTOR

BACK SIDE WINDS - WANT TO PULL COLLECTOR UPFRONT SIDE WINDS - WANT TO PUSH COLLECTOR INTO GROUND (DOWN)COLLECTOR AND STRUCTURAL MOUNTING HAVE TO WITHSTAND ALL THIS FORCE

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Many Manufacturers Have Integrated Mounting Hardware

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Wind Loading

Dead Load: Structural-weight Of PanelLive Load: Walking On PanelWind Load: Check Wind Load Maps For Various Geographical AreasSnow Load: Snow Weight

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Wind Loading

Building Code Calculations– Velocity Pressure (From Wind Map And Ground Height)

X– Force Co-efficient (Tilt Of Array To Roof) X– Use Factor (How Hazardous In The Event Of Failure)

All of these issues are to be your guide and will be used by a structural engineer to determine the mounting method used on a building.

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Roof Penetration

Critical Part Of InstallationSolar And Roofing Industry Standards Are AppliedDiffering Methods– Flat Versus Pitched Roof– Truss Attachment

Flat Roof– Pitch Pans/epdm Boots

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Bracket Mounting

Spanner Mounting– SPANNERS or STRUT/ANGLE STEEL– Must Have Access To Attic Or Crawl Space– Spanner Acts As Anchor For Threaded Rod– Can Loosen Up In Time

J-bolt Mounting– Grip Truss– Can Access From Roof / Attic Is Better

Lag-bolt Mounting– Best Method When Done Correctly– Have To Lag Into Truss Not Just Sheathing

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Roof Rails

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Roof Rails

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Heritage Middle School

Raleigh, NC

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Millbrook Elementary SchoolRaleigh, NC

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Metal RoofsStanding seam “S-5 Clips”

Match the manufacturers roof model profile

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S-5 Clip attached to standing seam

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Ground Mounting

Applicable when collector can not be mounted on roof – Shade, etc.

Footers must be used to provide stabilityGap between bottom of collector and groundIdeal for THERMOSIPHON systems

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Curb design is calculated for the load

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390 Pounds of Weight Per Vertical Rail

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Roof Curbs

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Curbs and Rack

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Roof Curbs

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Roof Curbs

Cleaned to the Membrane

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Roof Curbs

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Spanneracross the

metal truss system

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Strut and All Thread

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64 Collector ArrayNew York City

Mixed Use Building

Commercial

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Refurbished – (3) 6,000-Gallon – 100 Collector Solar Water Heating SystemsUSMC Camp Lejeune, NC

Rack

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Manufactured Mounting System

Designed to less than 1-5 psf

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Crash #3 Chicago O’Hare

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Roof Curbs

Cleaned to the Membrane

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Crash #3 Chicago O’Hare

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End