Tamarack Solar Ground Mount Kit User manual

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
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Tamarack Solar
Ground Mount Kit
Installation Manual
Solar Products
Tamarack

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
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Table of Contents
Features and Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installer Responsibilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Tools Required and Torque Specications . . . . . . . . . . . . . . . . . . . . . . . 6
Installation Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Vertical Post Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Foundation Design and Construction. . . . . . . . . . . . . . . . . . . . . . . . 9 - 15
Attaching Rails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
System Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Module Level Power Electronics (MLPE) Installation and Wire Management . . . . 18
Module Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 - 19
Module Compatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 - 21
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Customer Support
Tamarack Solar makes every e󰀨ort to ensure your mounting kit is easy to install. If you
need assistance at any point in your installation or have suggestions on how we can
improve your experience, call customer support at 1-800-819-7236 ext 556 or email us at
[e-mail]
Technical Support: 707-234-8107 or [e-mail]

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
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Tamarack Ground Mount System Features
• Designed for mounting photovoltaic (PV) arrays on the ground.
• Top clamps and rail attachments require the use of a single standard 1/2-inch socket
• 5050 Clamp for both mid-clamp and end-clamp use simplies ordering and stocking parts.
• Module clamps are spring loaded to ease module placement.
• Built-in wire management for module and microinverter cables
Tamarack Product Summary
The Tamarack Solar Ground Mount system is a visually appealing photovoltaic (PV) module installation system
that signicantly lowers PV module installation cost by allowing the installation professional to stock fewer
parts and to complete the installation in less time.
Certied to meet local and International Building Codes and ASCE/SEI-7
when installed in accordance with this manual.
ETL Listed to UL 2307 for bonding and grounding when in¬stalled in
accordance with this manual.
Rails, clamps, splices, and mounting devices are UL2703 Listed for
mounting at-plate Photovoltaic Modules and Panels
• Conforms to STD UL 2703 (2015) Standard for Safety First Edition: Mounting Systems, Mounting Devices,
Clamping/Retention Devices, and Ground Lugs for Use with Flat-Plate Photovoltaic Modules and Panels.
• Certied to CSA STD LTR AE-001-2012 Photovoltaic Module Racking Systems.
• Max Overcurrent Protective Device (OCPD) Rating: 20A
• Max Module Size: 25.6 ft²
• System Level Allowable Design Load Rating: meets minimum requirements of the standard (10 PSF down-
ward, 5 PSF upward, 5 PSF lateral). Actual system structural capacity is dened by PE stamped certication
letters.
Tamarack Solar Ground Mounts use Hollaender® structural aluminum pipe ttings that combined with pipe
make stable, secure, corrosion-free mounting rack systems for both ground and roof mounted solar arrays. Hol-
laender’s Speed-Rail® ttings are ideal for this application because the aluminum-magnesium 535 alloy used
to manufacture them is the most corrosion resistant aluminum alloy available. It can be used with steel without
any concern for galvanic corrosion. Hollaender Speed-Rail® ttings are now approved as UL 2703 Recognized
Components under ETL Mark 5006568. The system uses set-screws that penetrate the surface of the pipe to
ensure that ttings are electrically bonded to pipe and bracing, thereby eliminating the need for added bonding
components such as jumpers to provide a grounding path.
This manual describes proper installation procedures and provides necessary standards required for product
reliability. Warranty details are available on our website. www.tamaracksolar.com
All installers must thoroughly read this manual and have a clear understanding of the installation procedures
prior to installation. Failure to follow these guidelines may result in property damage, bodily injury or even
death.
5014275

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
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Installer Responsibilities
• Follow all applicable local or national building and re codes, including any that may supersede this manual.
• Electrical installation should be conducted by a licensed and bonded electrician or solar contractor.
• Module maintenance or removal must not break the bonding path of the system.
• Ensure all products used are appropriate for the installation and array under the site’s wind and snow loading
conditions.
• Ensure information is used for the system design is accurate. Any inaccurate information used for the system
design will cause errors and are the installer’s responsibility to correct.
• We recommend consulting with your local building department about local regulations and building require-
ments, including soil conditions, terrain, and wind and snow load requirements. Local conditions and
• Use only Tamarack Solar Products parts or parts approved by Tamarack; substituting parts may void any
applicable warranty.
• Ensure bare copper grounding conductors do not contact aluminum and zinc-plated steel components in order
to prevent the risk of galvanic corrosion.
• The Installation should be inspected periodically, and any loose components or fasteners should be retight-
ened. Any corroded parts found should be examined carefully to assess whether the corrosion compromises the
physical integrity or performance of the system, and if so, the corrosion should be remediated, or the aected
components replaced.
• Provide an appropriate method of direct-to-earth grounding according to the latest edition of the National
Electrical Code, including NEC 250: Grounding and Bonding, NEC 690: Solar Photovoltaic Systems, and CSA
C22.1, Safety Standard for Electrical Installations, Canadian Electrical Code, Part 1
• Disconnect AC power before servicing or removing microinverters and power optimizers.
• Review photovoltaic module manufacturer’s documentation to ensure compatibility and compliance with
warranty terms and conditions.
• Maximum Series Fuse Rating for the photovoltaic array is 20 Amps.
For Technical Support, call 707-234-8107 or 800-819-7236 ext.556, email us at
[e-mail]
Ground Mount Kit Description
• Kits contains all parts required except 2-inch schedule 40 pipe and concrete
• Choose one starter kit for rst column of 3 or 4 modules
• Expand with up to 7 add-on column kits
• Mount up to 64 modules on a single structure.
• Rated for up to 170 MPH wind speed and 50 psf of snow load
• Some situations require cross bracing (see table on page 8)

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Tamarack Ground Mount System Components
3.1 inch Rail
Pipe Mount Clamp
Rail Splice
5050 Clamp
Ground Lug
Wire Management Clip
MLPE Adapter
Module Frame Ground Lug
Rail End Cap
Socket Tee Flexible Tee

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Tools Required
• Post Hole Digger or Power Auger
• Torque Wrench (0-240 in-lbs recommended)
• Socket Driver with a 1/2-inch
• 3/16-inch Allen Head Driver Socket
• String Line and Level, or Transit
• Plumb Bob
• Tape Measure
• Chop Saw with metal-cutting blade (only required if cutting aluminum rails)
• Pipe Cutter for cutting 2” steel pipe (reciprocating saw or portable bandsaw could be used)
Torque Specications
Rail Adapter on Pipe Mount Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 in-lbs (12 ft-lbs)
U-Bolt Nuts on Pipe Mount Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 in-lbs (6 ft-lbs)
Socket Tees, Flex Socket Tees . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204 in-lbs (17 ft-lbs)
Rail Splice Lock bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 in-lbs (12 ft-lbs)
MLPE Rail Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 in-lbs (12 ft-lbs)
Ground Lug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144 in-lbs (12 ft-lbs)
5050 Clamp as Mid-Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 in-lbs (12 ft-lbs)
5050 Clamp as End Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72-108 in-lbs (6-9 ft-lbs)
Ground Lug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 in-lbs (12 ft-lbs)
Ilsco SGB-4 Module Frame Ground lug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 in-lbs (12 ft-lbs)
System Design
• Make a drawing showing the dimensions of the mount system and the location of the mounting peers.
• Read this manual before beginning installation.
• Purchase 2-inch schedule 40 pipe for vertical posts, horizontal supports and cross bracing if necessary for
your snow load and wind load requirement.
• Tamarack design information assumes the array is to be on ground with no more than 15 degrees of slope.
• Tamarack Ground Mount Kits are for use in sites with Class 3 or Class 4 soil type and terrain exposure
category B.
• If terrain and/or soils conditions are dierent, consult a structural engineer.
Class 3 Soil: Medium dense coarse sands, sandy gravels, very sti silts, and clays.
Class 4 Soil: Loose to medium dense sands, rm to sti clays and silts, alluvial ll.
• Exposure Category B is an urban, suburban or wooded area. Obstructions the size of single family dwellings
must surround the structure at within 2,630 ft or 10 times the mounting structure height in all directions,
whichever is greater.

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
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Preparations for Installation
Plan the PV array layout and conrm that plans comply with local AHJ requirements and applicable building
codes. Leave enough room to work safely around the array during the installation process. Some building and
re codes require minimum clearances around PV module installations.
The length of the rails for each column in the installation will be equal to the total width of all of the modules
in each column, plus 1/2-inch for each 5050 clamp used between modules, plus 2-inches total for end clamping
(1” on each rail end).
Purchase 2-inch (NPS) ASTM A53 Grade B Schedule-40 Steel Pipe (2.375-inch O.D.), galvanized to a min of
ASTM A653 G90 or ASTM A123 G35, or 2.375-inch (O.D.) Allied Mechanical Tubing with Gatorshield or
FlowCoat Zinc Coating (ASTM A1057)
Use the table below to estimate the length of the vertical pipe required. The pipe lengths shown are the above
ground portion. Determine the depth of the foundation holes (see pages 10 - 11) and add at least enough pipe to
reach down of 2/3 of each hole. If the ground is sloped to the south, subtract the ground height dierence of the
rear pier location from the front
Example: With a rear post that is 80-inches above ground, and with a required hole depth of 48-inches, add
32-inches (48 x 0.66) to the 80-inches for a total of 112-inches.
If the system to be installed requires cross bracing, one pipe will be required for each front to back brace. Pipe
length will be approximately 75 inches for systems with 3 modules per column and 95 inches for systems with 4
modules per column.
Slope
(deg)
Front Vertical
Pipe (inches)
Above Ground
Rear Vertical
Pipe (inches)
Above Ground
Front Vertical
Pipe (inches)
Above Ground
Rear Vertical
Pipe (inches)
Above Ground
030 30 30 30
530 36 30 38
10 30 43 30 46
15 30 49 30 54
20 30 56 30 63
25 30 64 30 72
30 30 72 30 82
35 30 80 30 93
40 30 90 30 106
45 30 102 30 120
3 Modules per Column
4 Modules per Column
For Vertical pipe length add foundation depth x .66

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
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Determine Post Spacing and Need For Cross Bracing
The Tamarack Ground Mount Kits allow for two potential design congurations,
either three or four modules per column in landscape orientation (long side of the
modules perpendicular to the ground).
North to South post spacing is always constant and depends on number of
modules in each column.
Mounts with 3 modules per column have 72-inch North/South spacing.
Mounts with 4 modules per column have 90-inch North/South spacing
Some congurations require cross bracing
between each North and South vertical
post. Bracing requirement is based on
maximum snow load, maximum wind load
and array tilt angle. See the table at right
to determine if cross bracing is required.
Dark gray cells require cross bracing. Light
gray cells do not require cross bracing.
Cells with [60] can only be used with
modules no longer than 67-inches. Black
cells will require more vertical posts.
This conguration is not allowed using a
standard kit.
Contact technical support.
• East to West post spacing will be:
69-inches when using 72 cell modules
with a length of 80-inches or less on
the long side
• 62-inches when using 60 cell modules
with a length of 66-inches or less on
the long side.
The minumum length of the horizontal pipe in inches must be equal to the ((L + 0.5) x N) – (L x 0.4)
Where L = Module Length in inches and N = Number of Columns in the array being installed.
The horizontal pipe will cantilever past the end posts and should extend past the end posts an equal distance on
each end.
Column
Height
Snow
Load (psf)
Tilt
Angle
100 110 120 130 140 150 160 170
20
30
40
20
30
40
20
30
40
20
30
40
20
30 60
40
20 60
30 60 60
40
20 60 60 60
30 60 60
40
20 60 60
30 60
40
Maximum Wind Rating (MPH)
3 Modules
in
Landscape
Orientation
20
30
40
50
4 Modules
in
Landscape
Orientation
20
30
40
50

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Foundation Hole and Post Layout
Using batter boards and string lines, lay out your footing
locations for both the front and back east-west rows of piers.
This will consist of two string lines, one for the front east-west
row of piers and one for the back row of piers. Be sure that
the two strings are parallel to each other, and with the proper
spacing between the two east-west rows (this spacing depends
on whether you use columns of 3 or 4 modules - see page 8).
Once you have the two east-west string lines properly in place,
place the rst north-south string across one end, at the location
where you want the rst piers to be located. The rst two piers
(front and back) will be located directly below
where the north-south string and two east-west
strings cross.
Continue to add batter boards and north south
strings, spaced apart according to the proper east-
west pier spacing. If you only need four piers (two
front and two rear), you will only need two north-
south strings. If you need six piers total, you will
need three north-south strings. Eight piers would
required four strings, etc.
Make sure that the strings are in the proper
locations and adjust as needed. Make sure that the
whole layout is square and aligned evenly.
Directly below where each north-south string crosses one of the east-west strings will be the location of the
center of a foundation hole and pier. Use a plumb bob to locate those points on the ground and drive a stake at
each location. These are the centers of where the holes will be excavated. Once the stakes are driven, the strings
may be temporarily removed.
Excavating Holes for Concrete Piers
Using a 12-inch power auger, excavate
footings at marked locations to the depth
required. See Charts on page 10 and 11.
Re-install the layout strings to make sure
that the holes are excavated at the proper
locations and adjust the hole centers if
necessary. Clean out as much loose soil as
you can from the augured holes.

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
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Determine Concrete Piers Depth - 3 Modules per Column
Hole depth for 12-inch diameter foundation piers for structures with 3 modules per column can be found in the
table below.
Larger diameter foundations with less depth may also be used. Please contact technical support for depths of
holes that are 16, 20 or 24 inches in diameter. They will require more concrete, but may be helpful if there is a
problem reaching the depths listed in the table below.
Minimum Foundation Depth (inches) - 3 Modules per Column
Soil
Type
Braced/
Unbraced
Slope
(deg) 90 95 100 105 110 120 130 140 150 160 170
036 36 36 36 36 36 36 36 36 36 36
536 36 36 36 36 36 36 36 36 36 36
10 36 36 36 36 36 36 36 36 36 36 36
15 36 36 36 42 42 42 42 42 48 48 48
20 42 42 42 48 48 48 48 48 48 48 48
25 48 48 48 48 48 48 48 48 48 48 48
30 48 48 48 48 48 48 48 48 48 48 48
35 48 48 48 48 48 48 48 48 48 48 48
40 48 48 48 48 48 48 48 48 48 48
45 48 48 48 48 48 48 48 48
036 36 36 36 36 36 36 36 36 36 36
536 36 36 36 36 36 36 36 36 36 36
10 36 36 36 36 36 36 36 36 36 36 36
15 36 36 36 36 36 36 36 42 42 42 42
20 36 36 36 42 42 42 42 48 48 48 48
25 42 42 42 42 48 48 48 54 54 54 60
30 48 48 48 48 54 54 54 60 60 60 60
35 48 54 54 54 54 60 60 60 66 66 66
40 54 54 54 60 60 60 66 66 66 72 72
45 60 60 60 60 66 66 66 72 72 78 78
036 36 36 36 36 36 36 36 36 36 36
536 36 36 36 36 36 36 36 36 36 36
10 36 36 36 36 36 36 36 42 42 42 42
15 42 42 42 42 42 48 48 48 54 54 54
20 42 42 42 48 48 48 48 48 48 48 48
25 48 48 48 48 48 48 48 48 48 48 48
30 48 48 48 48 48 48 48 48 48 48 54
35 48 48 48 48 48 48 48 48 48 54 54
40 54 54 54 54 54 54 54 54 54 54
45 54 54 54 54 54 54 54 54
036 36 36 36 36 36 36 36 36 36 36
536 36 36 36 36 36 36 36 36 36 36
10 36 36 36 36 36 36 36 36 42 42 48
15 36 36 36 36 42 42 42 42 48 48 54
20 42 42 42 42 48 48 48 48 54 54 60
25 48 48 48 54 54 54 60 60 60 66 66
30 54 54 54 60 60 60 66 66 66 72 72
35 54 60 60 60 60 66 66 72 72 78 78
40 60 60 66 66 66 72 72 78 78 78 84
45 66 66 72 72 78 78 78 84 84 90 90
Soil Class 4
Braced
Wind Speed Rating
Minimum Foundation Depth (inches) - 3 Modules per Column
Tamarack Ground Mount
Kit Foundation Info
Soil Class 3
Unbraced
Soil Class 3
Braced
Soil Class 4
Unbraced

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
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Determine Concrete Piers Depth - 4 Modules per Column
Hole depth for 12-inch diameter foundation piers for structures with 4 modules per column can be found in the
table below.
Larger diameter foundations with less depth may also be used. Please contact technical support for depths of
holes that are 16, 20 or 24 inches in diameter. They will require more concrete, but may be helpful if there is a
problem reaching the depths listed in the table below.
Minimum Foundation Depth (inches) - 4 Modules per Column
Soil
Type
Braced/
Unbraced
Slope
(deg) 90 95 100 105 110 120 130 140 150 160 170
036 36 36 36 36 36 36 36 36 36 36
536 36 36 36 36 36 36 36 36 36 36
10 36 36 36 36 36 36 36 36 36 42 42
15 36 42 42 42 42 42 48 48 48 48 48
20 42 48 42 48 48 48 48 48 48 48 48
25 48 48 48 48 48 48 48 48 48 48 48
30 48 48 48 48 48 48 48 48 48 48
35 48 48 48 48 48 48 48 48 48
40 48 48 48 48 48 48 48
45 48 48 48 48 48 48
036 36 36 36 36 36 36 36 36 36 36
536 36 36 36 36 36 36 36 36 36 36
10 36 36 36 36 36 36 36 36 36 36 42
15 36 36 36 36 36 36 42 42 42 42 48
20 36 42 42 42 42 48 48 48 48 54 54
25 48 42 48 48 48 54 54 54 54 60 60
30 48 48 54 54 54 54 60 60 66 66 66
35 48 54 54 54 60 60 66 66 66 72 72
40 54 60 60 60 60 66 66 72 72 78 78
45 60 60 60 66 66 72 72 78 78 84 84
036 36 36 36 36 36 36 36 36 36 42
536 36 36 36 36 36 36 36 36 36 42
10 36 36 36 36 36 42 42 42 42 48 48
15 42 42 48 48 48 48 48 54 54 54 54
20 48 54 54 54 54 54 54 54 54 54 54
25 54 54 54 54 54 54 54 54 54 54 54
30 54 54 54 54 54 54 54 54 54 54
35 54 54 54 54 54 54 54 54 54
40 54 54 54 54 54 54 54
45 54 54 54 54 54 54
036 36 36 36 36 36 36 36 36 36 42
536 36 36 36 36 36 36 36 36 42 42
10 36 36 36 36 36 36 42 42 48 48 54
15 36 42 42 42 42 42 48 48 54 54 60
20 42 48 48 48 48 48 54 54 54 60 66
25 48 54 54 54 54 60 60 60 66 66 72
30 54 60 60 60 60 66 66 72 72 72 78
35 60 60 66 66 66 72 72 78 78 78 84
40 66 66 66 72 72 72 78 78 84 84 90
45 72 72 72 78 78 78 84 90 90 90 96
Tamarack Ground Mount
Kit Foundation Info
Minimum Foundation Depth (inches) - 4 Modules per Column
Wind Speed Rating
Soil Class 3
Unbraced
Soil Class 3
Braced
Soil Class 4
Unbraced
Soil Class 4
Braced

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
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Assemble Pipe Structure and Prepare for Concrete
While there is a number of methods that can be used to set the vertical pipe posts in concrete, we recommend
the following method which makes it easier to align and level the pipe sub-structure:
Using the Socket Tee ttings and sections of 2-inch pipe, assemble both the front and back 2-inch pipe hori-
zontal beams, placing the Socket Tees at the proper distance apart based on the required pier spacing. Tighten
the Tee’s set screws just enough to hold them in place, but not fully tightened as their location may need to be
adjusted later. Leave the horizontal pipe longer than necessary until the rails are assembled. This will allow for
some adjustment from side to side.
NOTE: Schedule-40 steel pipe is available in lengths up to 21 feet. For arrays with more than 3 or 4
columns, you may need to couple two sections of pipe together. You can abut pipe sections in the center
of a Socket Tee, or by using a 2-inch threaded pipe coupling in a span between posts, however, coupled
splices should not be located in the middle 1/3 of any span between vertical posts.
The height of the north (rear) posts will be determined by the tilt angle of the array. See page 7.
North - South post spacing is:
• 72” for columns of 3 modules
• 90” for columns of 4 modules.
Support the horizontal pipe
beams at the proper height
above the ground level using
X-brace pipe supports made
with 2x4 or 2x6 wood boards
(or use commercially available
pipe supports). The X-braces
can be each be made using two
boards with holes drilled at the
proper location, and a connect-
ed together with a single bolt
and nut to act as a hinge.
Center the Socket Tee ttings
on the 2-inch pipe directly
above the excavated holes.
Level the two horizontal
beams; make sure they are
straight and parallel with each
other, and at the proper dis-
tance apart. The two boards
of each X-brace can be pulled
closer together at the bottom to raise the beam or drawn further apart to lower the beam to achieve level. Hold
the X-braces in place with another board going down to the ground set at 90° to the X-braces as shown in the
photos. Fine adjustment to level can also be done using shims between the beam pipes and the X-Braces. If the
horizontal beams are long, you can do this in sections for easier handling. Check for array tilt consistency along
the entire length of array and adjust if necessary.

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
13
Use stakes at the bases of the brace
boards to hold them in place. Steel
concrete form stakes are perfect for
this purpose, but you can also use
wooden stakes.
Tops of the concrete piers need
to be above ground level to keep
water from pooling around the pipe
posts. Use of Sonotube material to
form a pedestal above the in-ground
section of the concrete piers. Use
12-inch diameter Sonotube material
or equivalent. It is only necessary
for the tubes to be located from the
ground level up. They do not need to
extend into the holes. 6-inches above
ground is plenty to produce a proper
pier pedestal.
Temporarily hang Sonotube sections from the horizontal beams at each vertical post location before installing
the pipe posts into the assembly. They will need to remain suspended until the concrete is poured, and then
placed into position above ground level during the concrete pour.
NOTE: For systems with North-South cross bracing, slide a Flex Socket Tee onto each of the vertical pipe
posts before installing them onto the horizontal beams. Tighten the set screws just enough to hold them to
the pipes at some point near the center so that they are not in the way as you construct the rest of the pipe
sub-structure. Their exact position will be determined and set later. If you neglect to do this before the
concrete is poured, you will need to remove the horizontal pipe beams after the concrete has set in order
to slide the Adjustable Socket Tees onto the posts.
Next, hang the pipe posts from the Socket Tee ttings. Insert a the each vertical post down into each hole at
each of the post locations, and lift them up through the suspended Sonotube rings and into the bottom parts of
the Socket Tees. Make sure that each post is fully inserted into each Socket Tee. Try not to allow the posts to
contact the soil on the sides or bottom of the holes. If they do, do not allow any soil material to remain on or
inside the pipes. Tighten the set screws in the Socket Tees just enough to hold the vertical pipes in place. Ensure
that the bottom of each pipe extends 2/3 of the way to the bottom of the hole. Then tighten the Socket Tee’s set
screws on the vertical pipe to make sure that they stay in place.
Make any horizontal adjustments to the Socket Tees required to center the vertical pipe in the holes. Do a nal
check to make sure that the horizontal beams are level and properly located at the correct spacing between each
other, and that the posts are plumb and centered in the holes.

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
14
Pouring Concrete
Pour mixed concrete (minimum 2500 psi) into excavated holes. Use a tamping tool (a length of 2x4 works well)
to compress the wet concrete and make sure there are no trapped air pockets. As you ll the hole with concrete
make sure that the vertical post remains centered and plumb.
Fill the holes to ground level, and then lower the previously hung Sonotube sections down onto the wet
concrete, with the pipe posts centered. Twist or shake the Sonotube to make sure it is in full contact with the wet
concrete. Use a short level to make sure that the sides of the Sonotubes are plumb and
ll the tubes with concrete. Trowel the tops of the concrete into a slight dome formation
to allow for water drainage. See drawing at right.
Allow the concrete to cure for at least 24 hours before proceeding.
System With Cross Braces
Skip this step if cross bracing is not required.
On each North-South post pair, loosen the set screws on the Flex Tees which were previously slid onto the
vertical pipe before they were installed.
Slide the one on the rear (north) post all the way to the bottom and slide the one on the front (south) post to the
Socket Tee on the top of the vertical pipe. (this will allow space as you insert the brace pipes).
Face and align the two swivel sockets towards each other – the socket on the raised south Flex Tee facing down
towards the Flex Tee on the north post. Tighten the set screws just enough to hold both Flex Tees in place.
Measure the length of pipe needed to be the brace
pipe. The pipe ends can be inserted 2 inches into
each Flex Tee, but in order to insert the pipe into both
Tees, the pipe will need to cut shorter. Measure from
the very inside of one of the Flex Tees to the outside
edge of the other Flex Tee. Cut the pipe for the brace
to this length.
To assemble the brace, rst loosen the set screws on Flex Socket Tee at the bottom of the north post. Slide one
end of the brace pipe fully into this Flex Tee’s socket until it bottoms out, and tighten the set screw on the brace
pipe, but do not tighten the set screws on the post pipe yet.
Angle the brace pipe up toward the Flex Tee on the south post. After loosening the set screws on this Flex Tee,
guide the end of the pipe into the socket and lower the Flex Socket Tee assembly down until the pipe end is

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
15
fully seated into the socket and tighten the set screw onto the brace pipe.
Loosen the set screws on both of the Flex Tees that attach to the vertical posts. Position the brace assembly
up so that there no more than 6-inches from the center of the north-post Flex Socket Tee to the surface of the
concrete, and no more than 6-inches from the center of the south horizontal beam and the center of the Flex
Socket Tee on the south post. See drawing below.
Repeat this whole process for installing the cross braces on each north/south pair of posts. There may need to
be changes to the lengths of the brace pipes from location to location, especially if the installation site is not
completely level.

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
16
Assemble Module Support Rails
Rails for 4 modules consist of two 85-inch 3.1 rails connected together with a Rail Splice.
Rails for 3 modules, consist of one 85-inch rail and one 42.5-inch rail and a Rail Splice.
You will need two of these rail assemblies per column. The maximum
module width that can be accommodated on this rail length is 41.5-inches
per module.
Insert the RailSplice 5-inches into one rail end. Install one of the provided
Rail Splice Locks (roughly centered in the 5-inch insertion) and tighten
to hold it in place. Slide the second section of rail over the splice until it
contacts the rst section of rail and install the second Rail Splice Lock.
Tighten both Rail Splice Lock bolts to 144 inch-pounds (12 foot-pounds).
Either locking bolt may be loosened and moved slightly if it interferes with mid-clamp placement when
installing modules
Attach Pipe Mount Clamps to Rail Assemblies
Each Pipe Mount Clamp consists of a rail clamp
loosely bolted to an aluminum extrusion and a U-bolt
with hardware. Attach Pipe Mount Clamps to all of
the rails at this time. Position the adapter into the two
features on the bottom of the rail, and nger tighten
the bolt to allow for repositioning of the clamps on the
rails.
Install Rail Assemblies onto the Pipe Substructure
Mark the location of the rails on the lower horizontal pipe, leaving approximately 1/2-inch of space between the
colums.
Install the module rails to the horizontal pipes at
the location marks using the U-bolts on the pipe
mount clamps. Finger-tighten the ange nuts on
the Pipe Clamp U-bolts.
Square and center the rails at each end of the
horizontal pipes and tighten their hardware to 72
inch-pounds (6 foot-pounds). Run a string line
between the end rails and align the remaining
rails. You will need to loosen the Pipe Mount
Clamp ange nuts in order to slide the rail up or
down for alignment. Tighten the U-bolt nuts to 72
inch-pounds (6 foot-pounds) and the ange nuts to
144 inch-pounds (12 foot-pounds) on all rail
assemblies.
Pipe Mount Clamp

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
17
Grounding the Array
Tamarack rails and approved PV modules are bonded by 5050 Clamps and splices.
The 5050 Clamps achieve bonding to the module frames through stainless-steel
pins in the clamping surface of the clamp tops, which penetrate module frame
coatings. The rails and channel nuts are bonded because of the conductive surface
of the mill nish aluminum used in the rail construction.
SolarEdge Optimizers and Enphase Microinverters are bonded to the rails with
the Tamarack MPLE adapters. Other brands and models of power optimizers or
microinverters may require a dierent grounding method.
The Tamarack Pipe Mount Clamps provide grounding continuity between the rail assemblies and the horizontal
pipe.
The Socket Tees provide a grounding path between all connected sections of pipe.
Because all of the elements of an entire unied ground mount array are bonded electrically, the Tamarack Solar
Ground Mount only requires a single Ground Lug for the grounding connection.
Use a Ground Clamp to bond a grounding conductor to one of the rails. It does not matter which rail in the
array is used, but the rail closest to the nal grounding connection should be chosen to reduce the grounding
path as much as possible.
The Ground Clamp works with #10 - #6 AWG copper grounding conductors. A #6 AWG solid grounding
conductor should be used if the conductor is in any way potentially exposed to damage.
NOTE: If the PV module that you are using is not listed on our approved module list at the end
of this manual, the grounding method described above may not meet UL standards
for grounding. In this case the proper grounding method would be to use a
Module Frame Ground Lug on each module frame in the array, and connecting all of the frame grounding lugs
together with a copper grounding conductor.

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
18
Module Level Power Electronics
If you are using rail mounted Module Level
Power Electronics (MLPE), it is easiest install
them before installing the solar modules onto
the rail assemblies.
Use the Tamarack MLPE Adapter to attach
Enphase microinverters or SolarEdge
Optimizers to the rails. Tighten the bolts with a
1/2-inch socket to the specied torque.
Wire Management
Place the array’s electrical conductors and
connectors into the cavity of the rail channels.
Wires can be run through the splices, but check
to be sure that they do not conict with the self-
drilling fasteners.
Install the Wire Management Clips where
necessary to keep wires in the
channels. If you are using MLPE, use these clips to keep the MLPE wiring in place as it is laid into the rail
channels.
On a ground mount installation, these clips can be installed from behind the array as necessary to keep wires in
place. Use as many as needed to ensure that the wires stay in the rail channels over the years.
PV Module Installation
Start module installation at the bottom of the rst column. In order to center the column of modules, you will need
to determine if, and by how much, the mounting rails will extend past the bottom module and above the top module
in the column. This will be determined by the actual width of the particular PV module being used, the number of
modules per column, and the 1/2 inch spacing between the modules for the mid-clamps.
If installing columns of 3 modules, the rail lengths will be about 127.5 inches. If installing columns of 4 modules,
the rail lengths will be about 170 inches
To determine the actual full length of the module column:
For 3-module columns: 127.5 - (3 x module width + 1 inch)
For 4-module columns: 170 - (4 x module width + 1.5 inch)
The additional 1 or 1.5 inches in the formulas account for the space required for the 5050 Clamps between the
modules
For example: a 4-column installation with PV module measuring 39.5 inches in width:
170” – (4 x 39.5” + 1.5”) or 170” – 159.5” = 10.5 inches of extra rail length.
To center the column of modules on the rails, take that measurement of extra rail length and divide by 2. In the
example above, that would be 5.25 inches of rail that would extend past the bottom module and past top module in
the column.

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
19
Place a solar module on the rst set of rails so that it is the calculated
distance from the lower end of the rails and secure it in place with
a 5050 clamp on each rail. Since these clamps will be used as end
clamps, place the side of the top clamp with two pins toward the mod-
ules. Center the rst module east to west over the rails and hold in
place. Make sure that the module is straight and level on the rails and
tighten the two end clamp bolts to 96 inch-pounds (8 foot-pounds).
Install one 5050 Clamp in each rail on the other side of the rst
module and slide it down so that the inside of the clamp contacts the
frame of the rst module. The springs will hold the clamps in place
prior to tightening. Place the second module on the rails, align it with
the rst module, and slide down and fully into the two mid-clamps.
Tighten the mid-clamp bolts to 144 inch-pounds (12 foot-pounds) to
fully secure the module.
Install the third module (and fourth module if installing columns of
four) and mid-clamps on the rails in the column in the same manner,
aligning the corners of the modules as you go up the column. Check
to make sure that the modules in this rst column are all even and
straight, and where you want them to be.
On the top edge of the last module of the rst column, install the 5050 Clamps so that the sides with the two
stainless-steel pins are facing in toward the module frame, and the clamp is tight up against the module frame.
Tighten the two end clamp bolts to 96 inch-pounds (8 foot-pounds).
Install subsequent columns of modules
in the same manner. Leave 1/2-inch of
spacing between the columns. Make sure
that all of the rails are centered between
the north and south beams and extend
past the south beam the same distance at
the bottom end. Use a string line as an
alignment aid, or just do this with line-of-
sight
Do a nal check to be sure that all bolts
and installation hardware on the array is
properly tightened to the specied torque
values.
Module Compatability
The solar modules listed on the next two pages have been certied to meet UL 2703 standards when installed
with a Tamarack Solar FM Rail System.
Back View

2021 TAMARACK SOLAR - REVISION 5 FM SYSTEM MANUAL
20
Manufacturer Model
Aleo P18/P19/S18/S19/S59/S79.
AU Optronics PM Series
Astronergy
CHSM6612M, CHSM6612M/HV, CHSM6612P, CHSM6612P/HV, CHSM6610M (BL) (BF)/(HF), CHSM6610M/HV,
ASM3310P
Auxin AXN6M610Txxx, AXN6P610Txxx, AXN6M612Txxx, AXN6P612Txxx.
Axitec
AXIblackpremium 60 (35mm), AXIpower 60 (35mm), AXIpower 72 (40mm), AXIpremium 60 (35mm), AXIpremium
72 (40mm).
Boviet BVM6610, BVM6612, BNM6612
BYD P6K Series (35mm), MHK-36
Canadian Solar
CS6V-xxxM, CS6P-xxxP, CS6K-xxxM, CS5A-xxxM, CS6K-xxxMS CS6U-P, CS6U-M, CS6X-P, CS6K-MS, CS6K-M,
CS6K-P, CS6P-P, CS6P-M, CS3U-P, CS3U-MS, CS3K-P, CS3K-MS, CS1K-MS, CS3K, CS3K, CS3U, CS3U-MB-
AG, CS3K-MB-AG, CS3K-MB-AG, CS6K, CS6U, CS3L, CS3W, CS1H-MS, and CS1U-MS
CentrsoSolar America C and E series.
CTxxxMxx-01, CTxxxPxx-01, CTxxxMxx-02 Where “xx” denotes frame and backsheet color.
CT-03 Series
Dehui DH-60M xxx-xxxW
Eco Solargy ORION 1000 ECOXXXH156P-60, APOLLO 1000 ECOXXXT156M-60, and APOLLO 1000 ECOXXXA156M-60.
ET Solar ETAC Module, ET Module.
40mm frame: GCL-P6/72
35mm frame: GCL-P6/72, GCL-P6/72H, GCL-M6/72, GCL-M6/72H
35mm frame (Black frame): GCL-P6/60, GCL-M6/60
Hansol TD-AN3 (40mm), TD-AN4, UB-AN1 (35mm), UD-AN1 (40mm), UB-AN1, UD-AN1
Heliene 36M, 60M, 72M, 60P, and 72P.
HT Solar HT60-156(M) (NDV) (-F), HT 72-156(M/P)
Hyundai HI, KG, MG, TG, RI, RG, TI, MI, KI series (35mm and 40mm).
ITEK iT-xxx, iT-xxx-HE, iT-xxx-SE, iT-xxx-SE-72 (40mm).
JAP6 60-xxx, JAM6-60-xxx/SI, JAM6(K)-60/xxx, JAP6(k)-72-xxx/4BB, JAP72SYY-xxx/ZZ, JAP6(k)-60-xxx/4BB,
JAP60SYY-xxx/ZZ, JAM6(k)-72-xxx/ZZ, JAM72SYY-xxx/ZZ, JAM6(k)-60-xxx/ZZ, JAM60SYY-xxx/ZZ, JAM 72S09,
JAM72S10, JAP72S10, JAM60S10, JAP60S10
i. YY: 01 white backsheet, 02 black backsheet, 03 half-cell and white backsheet, 09 M4 cell, 10 M4 1/2 cell
ii. ZZ: SC standard cell, PR = perc, BP = bifacial, HiT = HIT, IB = IBC, MW = MWT
Japan Solar
JPS-xxxP-60 (35mm), JPS-xxxM-60 (35mm), JPS-xxx-P-72 (40mm), JPS-xxxM-60-BB (35mm), JPS-xxx-P-72-BB
(40mm)
JKM xxx P-60, JKM xxx PP-60, JKM xxx M-60, JKM xxx M-60B, JKMS xxx PP-60
JKMS xxx P-60, JKMSxxx-72, JKMxxxP-72, JKMSxxxP-72, JKMxxxM-72, JK07A (JKMSxxxPP-60 & JKMSxxxPP-
72), JK07B (JKMSxxxPP-60), JKM xxx PP-60(Plus), JKM xxx PP-60B, JKM xxx M-60B, JKMSxxxM-60, JKMSxxxM-
60-EP, JKM xxx P-72B, JKMxxxPP-72, JKMxxxPP-72B, JKMxxxPP-72(Plus), JKMSxxxPP-72, JKMxxxM-72-V,
JKMxxxPP-72-V, JKMxxx-72L-V, JKMxxx-72HL-V, JKMxxxM-60L, JKMxxxM-60BL, JKMxxxM-60HL, JKMxxxM-
72HL-V, JKMxxxM-72L-V
G3, L-G4 and L-G2, Q.PLUS G4 xxx, Q.PLUS BFR G4.1/TAA xxx, Q.PLUS BFR, G4.1/MAX xxx, Q.PLUS BFR
G4.1 xxx, Q.PRO-G4 xxx, Q.PRO EC-G4.4 xxx, Q.PRO BFR G4 xxx, Q.PRO BFR G4.1 xxx, Q.PRO
BFR G4.3 xxx,
Q.PEAK-G4.1 xxx
Q.PEAK- G4.1/MAX xxx, Q.PEAK BLK G4.1 xxx, Q.PEAK-G4.1/TAA xxx
Q.PEAK BLK G4.1/TAA xxx, B.LINE PRO BFR G4.1 xxx, B.LINE PLUS BFR G4.1 xxx, B.LINE PRO BFR G4.1 xxx,
Q.PEAK DUO-G5-xxx, Q.PEAK DUO-G5.X-xxx and Q.PEAK DUO BLK-G5-xxx
Q.PEAK L G4.2, Q.PLUS L G4.2, Q.PLUS L G4.1 -35mm, Q.PLUS L G4 - 35mm, Q.PRO L G4 -35mm, Q.PRO L
G4.1 - 35mm, Q.PRO L G4.2 - 35mm, B.LINE PLUS L G4.2 - 35mm, B.LINE PRO L G4.1 - 35mm, B.LINE PRO L
G4.2 - 35mm, Q.PLUS L-G4.2/TAA -35mm, Q.PEAK DUO L-G5.2, Q.PEAK DUO L-G5.3 (380-395), Q.Peak Duo L-
G6 xxx, Q.Peak Duo L-G6.2 xxx, Q.Peak Duo L-G6.3 xxx, Q.Peak Duo G6 xxx, Q.Peak Duo BLK-G6 xxx
32mm high frame profile: Q.PEAK DUO-G7, B.LINE PEAK DUO-G7, Q.PEAK DUO-G7.2, B.LINE PEAK DUO-
G7.2, Q.PEAK DUO L-G7, Q.PEAK DUO L-G7.1, Q.PEAK DUO L-G7.2, Q.PEAK DUO L-G7.3, B.LINE PEAK DUO
L-G7, B.LINE PEAK DUO L-G7.1, B.LINE PEAK DUO L-G7.2, B.LINE PEAK DUO L-G7.3, Q.PEAK DUO-G8,
Q.PEAK DUO BLK-G8
Kyocera KU26x-6MCA where x is 0 or 5.
MONO X, MONO X 2, Mono X Plus, Mono Neon 2, Mono Neon 2
LG xxx S1C-L4, LG xxx N1C-G4
LG xxx S1C-A5, LG xxx N1C-A5, LGxxxQ1C(Q1K)-A5, LGxxxN1C(N1K)-A5, LGxxxS1C-A5, LGxxxA1C-A5,
LGxxxN2T-A4, LGxxxN2T-A5, LGxxxN2W-A5
LGxxxS2W-A5, LGxxxE1C-A5, LGxxxN1C(N1K)-G4, LGxxxN2W-G4, LGxxxS2W-G4
LGxxxS1C-G4, LGxxxE1K-A5, LGxxxN1K-V5, LGxxxN1C-V5, LGxxxQ1C-V5, LGxxxN2W-V5
LONGi
LR6-60 (40mm), LR6-72 (40mm), LR6-60 HV (40mm), LR6-72 HV (40mm), LR6-60 PH (40mm), LR6-72 PH
(40mm), LR6-60 PE (40mm), LR6-72 PE (45mm), LR6-60 BK (40mm Black frame), LR6-72 BK (40mm Black
frame), LR6-60 PB (40mm Black frame), LR6-72 PB (45mm Black frame) Number in paranthesis signifies frame
profile height.
Certified Module List for UL2703 Listing Program
Certainteed
GCL
JA Solar
Jinko
Hanwha Q-Cells
LG