Tamarack Solar PGRM Series Installation Manual page 4

Horizontal Beam Length and Post Placement Calculations
Use 3-inch Sch-40 pipe (3.5-inch OD) steel pipe.
Compute Horizontal Beam Length with the formula below.
W= Module Width (inches)
Beam Length Formula:
This is the minumum length required. There is no problem if the Main Beam is longer.
6 Module Example with modules that are 39.5-inches wide:
4.82" + (6 x 39.5") + (5 x 1.28") = 248.22 inches (or 20' 8-1/4")
Pipe generally comes in 21' lengths
When using a single vertical pole (4" Sch-40 pipe) (1-4 modules) center the beam over the vertical post.
When using 2 vertical posts, determine post center to center spacing. (2 posts required for 5 to 6 modules)
Mark the placement of the Mid Clamp and End Clamp U-Bolts on the Horizontal Beam.
If you are mounting an even number of modules, there will be a clamp at the center point of the Horizontal
Beam. If you are mounting an odd number of modules there will be a clamp on each side of the center of the
Horizontal Beam that are W+1.28-inches apart.
Assemble Pipe Cap(s) and Horizontal Beam
Place Top Cap(s) on 4-inch Schedule 40 vertical post(s) but do not tighten set-screws at this
time.
Place U-Bolt clamp saddles over the mounting holes on the top caps.
Place the Horizontal Beam pipe onto the U-Bolt clamp saddles centered over the holes on
each end of the top cap(s).
Place the 1/2-inch U-bolts over the Horizontal beam through the U-Bolt clamps and top
caps, loosely attach with 1/2-inch flat washers, lock washers and nuts.
Align the Horizontal Beam approximately east to west and torque the set-screws to 40 ft-lbs.
Tighten the jam nuts to prevent the screws from backing off over time.
Tighten the nuts on the U-bolts to keep the Horizontal Beam from rotating as you install
the modules. Torque on these nuts after you set the tile angle later in the installation.
Q= Quantity of Modules
Length (inches) = 4.82 + (Q x W) + ((Q – 1) x 1.28)