APA TITAN DUO User manual
Updated: April 2021
INSTALLATION MANUAL
PAGE 2 - INSTALLATION MANUAL
TITAN DUO
EQUIPMENT CHECKLIST
EQUIPMENT REQUIRED
ANCHOR DRIVING EQUIPMENT
TOOLS REQUIRED
TAPE MEASURE
LEVEL
ANGLE INDICATOR
TORQUE WRENCH
CORDLESS DRILL OR IMPACT DRIVER
RUBBER MALLET
SOCKET WRENCH
STRING LINE
OTHER COMMON CONSTRUCTION TOOLS
AS REQUIRED
SAFETY EQUIPMENT (PPE)
SAFETY GLASSES
HARD HAT
REFLECTIVE SAFETY VEST OR SHIRT
REQUIRED
TABLE OF CONTENTS
PAGE
2
3 PARTS LIST
4 SITE PREPARATION, UTILITIES, SURVEYING
FLAT SITES, UNEVEN GROUND, OBSTRUCTIONS, HEIGHT ADJUSTMENTS
7 PILE INSTALLATION, ALTERNATE PILE INSTALLATION
8 ANCHOR POST-TO-PILE
KNEE BRACE-TO-BRACE CLAMP
ROLL BRACKET-TO-N/S CHORD, ZEE PURLIN STAGING
ZEE PURLINS-TO-ROLL BRACKET, ZEE PURLINS-TO-N/S CHORD
TRANSVERSE BRACE-TO-ZEE PURLIN
TRANSVERSE BRACE-TO-ZEE PRULING (CONTINUED), ZEE PURLIN-TO-ZEE PURLIN (SPLICE)
GRAVITY CLIP PREINSTALLATION, PANEL INSTALLATION
10
11
12
13
14
PANEL INSTALLATION (CONTINUED)
PRO-TIPS
17
18
CABLE BRACE-TO-ANCHOR POST
OR
1
2
3
4
7
8
17
10 11 12 13
14
STRUCTURAL MEMBERS
[1] ROLL BRACKET ASSEMBLY
2X 3/8-16X1.0" PUSH-IN STUD
1X 1/2-13X1.0" PUSH-IN STUD
[2] NS CHORD
[3] EW ZEE PURLIN
[4] KNEE BRACE
[5] TRANSVERSE BRACE
[6] SCREW PILE
[7] ANCHOR POST
[8] CABLE BRACE
HARDWARE
[9]
[10] 1/2-13 SERRATED FLANGE NUT
[11] 1/2-13X1.0" SERRATED FLANGE BOLT
[12]
[13] END CLAMP ASSEMBLY
M8X1.25 25MM HEX BOLT
M8 LOCK WASHER
END CLAMP (SIZED FOR PANEL)
M8X1.25 SERRATED FLANGE NUT
[14] *MIDCLAMP ASSEMBLY
M8X1.25 70MM HEX BOLT
M8 LOCK WASHER
MID CLAMP
SPRING
M8X1.25 SERRATED FLANGE NUT
[15] KNEE BRACE CLAMP
[16] CABLE CLAMP ASSEMBLY
CABLE CLAMP
5/16 HEX NUT
5/16 CARRIAGE BOLT
[17]
*FOR OUTER ZEE PURLINS; MIDCLAMPS:
WEEB WASHER
*FOR CENTER ZEE PURLIN, MIDCLAMPS:
GRAVITY CLIPS
PARTS LIST
PAGE 3 - INSTALLATION MANUAL
TITAN DUO
PAGE 4 - INSTALLATION MANUAL
TITAN DUO
PRO TIP
1
NOTE
Ideally, pile locations should be surveyed by a profes-
sional surveyor, who can stake out end of row post loca-
tions to the highest precision.
SITE PREPARATION
Site preparation should be conducted prior to construc-
tion. This will typically involve grubbing, rock and debris
removal, and any other preparation that will facilitate
swift and unhindered installation.
UTILITIES
All utilities should be marked before any construction
begins.
SURVEYING
To ensure the solar array is installed according to cus-
tomer plans, the beginning and end of each row must be
surveyed and staked, according to spacing determined
by AP Alternatives. This will typically be survey points
for the piles at each row end, for every row. This includes
the north and south pile location for the Titan Duo sys-
tem. Longer rows will also require additional, auxiliary
stakes, to assist in keeping rows straight. For projects
may also need to be installed.
CONSTRUCTION 101
All structures, regardless of how complex, are built one
step at a time. Each new step builds on the previous. In
to ensure that each step is correct. It is far easier, fast-
er, and cheaper to take your time to ensure each step
is done correctly, before moving on. There is no reme-
will be put forth eventually to redo steps, reconstruct,
-
mediately, each subsequent step will begin correct and
It is recommended to completely install a test row from
beginning-to-end of the row, and from beginning-to-end
of all steps (from layout, to panel installation, and ad-
justments). This will help you understand not only how
to install the product, but understand how tolerances
stack up, how mistakes in one step cause errors in oth-
er steps, and how to make the adjustments required to
keep everything in tolerance and looking good.
EQUAL
Measuring diagonals
PRO TIP
3
PRO TIP
2
STRINGING
1. Install a pile at the initial starting point. Remove the
initial pile marker and line the point of the screw pile
with the location where the marker was.
2. Ensure the pile is held plumb and in the proper loca-
tion using a level and steel measuring tape.
3. Drive the pile to the correct depth as indicated by the
construction documents (for Duo, this typically means
4. Repeat further down the row with another pile to cre-
ate the next attachment point for the string line, once
again measuring and ensuring plumbness.
5. Continue to the end of the row, as required to set a
string line.
6. Run a string line between all piles at the same height.
For consistency, the string line should run along the
same side of the pile for the entire site (for example, al-
ways wrap counterclockwise, then install new piles on
the south side of the string). This will help prevent zig-
zagging.
When topography is present, intermediate pile or stakes
must be installed so that the string line can transition
through hills and valleys at a moderate rate. Although
the racking will follow terrain, it has limits. Therefore,
process.
100"
200"
300"
400"
REVIEW & INSTALLATION PREPARATION
After site preparation has been completed and the site
surveying is done, the piles are ready to be installed. It
is the responsibility of the site lead to review and un-
derstand the site foundation layout, surroundings, in-
stallation procedures, and to manage the installation
(embedment depths, spans, etc.) that need to be met
according to site testing and data gathered prior to the
start of the project. The site lead must verify that the
piles on site match the order and project requirements.
Dimensions in the East-West direction will change de-
pending on row length, row location, and location with-
in the row. Closely follow the construction plans and if
there are any questions/discrepancies, bring them up
to the site lead or project manager before installing any
piles.
MEASURING
All measurements in the East-West direction must be
made with a steel tape, and made from the start of the
row, not pile to pile. For example, if the plans were to call
staked to the ground, and the ground should be marked
Measuring from pile to pile allows tolerances to stack
installation issues further down the road. If necessary,
tapes should be marked prior to usage or prints should
For Titan duo systems, the North and South points must
the other). Ensure the points are square every few sets
by measuring diagonals. If marks are found to be out of
square, make adjustments to correct.
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TITAN DUO
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TITAN DUO
PRO TIP
6
PRO TIP
5
OBSTRUCTIONS
If an impassable object is encountered at the desired
of the original location and drill new holes in the EW zee
purlins. For Duo, you must also move its mating post.
Example: If you move a North (tall) post, you must also
move the South (short) post (and vise versa) in the same
direction and distance to ensure they properly mate.
HEIGHT ADJUSTMENTS
When posts are secured at the incorrect height, an ad-
justment may need to be made. Tie a string from one
known good height post to another, on either side of
-
rect height for the enclosed posts. If the post is too tall,
loosen the pile bolts and adjust the post to the correct
height. If the post is too short and there is not enough
post length to adjust to the proper height (due to ter-
rain), a post splice or longer post may need to be used.
PRO TIP
4
FLAT SITES
Drive the pile with a single-point, starting at one end of
the site. The string line method is best for ensuring a
straight line and a perfect plain of the array. Alternative-
ly, use location lasers or GPS to keep in a straight line.
Use height lasers to ensure correct depth, or story sticks
if not equipped. If using a story stick, ensure measure-
ments are taken from the relative ground height, and
not a localized non-conformance, ie. mole hills, divots,
rocks, etc.
UNEVEN GROUNG
For sites with ungraded or rolling topography, the string
method can be used as well. It is important to ensure
that the posts are set to the correct depths, and that the
-
scape. These posts will need to be measured individually
from the ground to the top to ensure they are at the
correct height. In cases where post locations can not be
marked on the ground (uneven terrain), it is advised to
have the surveyor mark the location of every post, rath-
er than just the beginning and end of each row.
NOTE
Check all survey before pilot drilling.
PRO TIP
8
NORTH
EAST
1”
1”
1” ±1”
Rotate so holes
align east/west
±2° Plumb
1”
PRO TIP
7
PILE INSTALLATION
1. Install a pile at the initial point. Remove the initial pile
marker and line the point of the screw pile, or the center
of the helical pile, with the location of where the pile
marker was.
2. Ensure the pile is held plumb and in the proper loca-
tion using a level and steel measuring tape.
3. Drive the pile to the correct depth as indicated by the
ground).
4. Repeat further down the row with another pile to cre-
ate the next attachment point for the string line, once
again measuring and ensuring plumbness.
5. Continue to the end of the row, as required to set a
string line.
6. Run a string line between all piles at the same height.
For consistency, string line should run along the same
side of the pile for the entirety of the site (for example,
always wrap counterclockwise, then install new piles on
the south side of the string). This will help prevent zig-
zagging.
When topography is present, intermediate piles or
stakes must be installed so that the string line can
transition through hills and valleys at a moderate rate.
Although the racking will follow terrain, it has limits.
-
stallation process.
7. Install all remaining piles, as above, using the string-
line as a guide for placement and height.
ALTERNATE PILE INSTALLATION
For sites with medium to heavy rock or bedrock, holes
-
stall. When required, perform the following steps prior
to step 2 above.
1. With an auger or rock drill, drill a pilot hole to correct
depth and diameter.
2. Fill the hole with stone as indicated by APA.
PAGE 7 - INSTALLATION MANUAL
TITAN DUO
PAGE 8 - INSTALLATION MANUAL
TITAN DUO
ANCHOR POST-TO-PILE
1. Insert the short anchor post (pipe) in the front (South)
pile.
2. Measuring from the ground to the top of the post,
ensure the posts are at the correct height according to
the construction plans. Also ensure the upper bolt holes
are rotated to align in the East-West direction.
3. Secure the post at the pile with three (3) bolts. Screw
each bolt a little at a time so that all bolts engage the
same amount.
[6] SCREW PILE
[7] ANCHOR POST
[17]
4. Do the same by installing the long post in the rear
(North) pile.
5. Repeat a distance further down the row as you did
with the piles. Continue to the end of the row.
6. Run a string line between all the front posts and be-
tween all the rear posts.
7. Using string line as reference, install the intermediate
anchors as before.
8.
with the terrain in the method indicated in the construc-
tion plans.
9.-
rect, bolts can be tightened. Fully tightened bolts de-
form the posts creating a very strong bond and further
adjustments are typically not possible.
PRO TIP
9
Top view of anchor post and fully tightened bolts
17
7
N/S CHORD-TO-REAR POST
1. Attach the N/S chord to the rear post.
2. Ensure the N/S chord is on the West side of the post,
with the slots pointing upwards, as shown.
3. Secure with a bolt and a nut through the single hole.
Fasten loosely.
[2] NS CHORD
[7] ANCHOR POST
[12]
[10] 1/2-13 SERRATED FLANGE NUT
KNEE BRACE & CHORD-TO-FRONT POST
1. Attach the N/S chord and the knee brace to the front
post at the same time.
2. Refer to the construction drawings for the correct
nominal attachment holes/slots in both the knee brace
and the N/S chord. Additional holes/slots can be used
for adjustments.
3. Knee brace is symmetrical at both ends. Ensure the
4. Secure with a bolt and a nut through the single hole.
Fasten loosely.
[4] KNEE BRACE
KNEE BRACE-TO-BRACE CLAMP
1. Slide the brace clamp over the rear post prior to at-
it around the post, and squeeze it back to its original
shape.
2.
3. Secure through the nominal hole as indicated in the
construction documentation with a bolt and a nut. Fas-
ten loosely.
[15] KNEE BRACE CLAMP
[11]
NOTE
Images are for reference only. Ideal hole/slot connec-
tion points may vary.
27
10
12
2
7
4
12
10
PRO TIP
10
10
4
11
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1
2
PRO TIP
11
ROLL BRACKET-TO-N/S CHORD
1.
on the N/S chord pointing up, attach a preassembled
roll bracket.
2. Match the two (2) studs in the roll bracket assembly in
the correct hole set at the front of the part.
determine which set to use. Correct usage is based on
and will remain consistent on each project (assuming
only one module model is used).
3. Secure both studs, each with a nut.
4. Repeat steps for all remaining roll brackets. There are
three (3) roll brackets per N/S chord.
[2] NS CHORD
[1] ROLL BRACKET ASSEMBLY
[9]
ZEE PURLIN STAGING
Stage the zee purlins by setting them on the N/S chord
and resting above the roll brackets.
1. Refer to the build plans to ensure the correct zee pur-
either length or hole patten in the zee purlins, so ensure
the correct part number is used. There typically are mul-
tiple zee purlins of the same length, with only slightly
2. Ensure the zee purlins are in the correct orientation,
as shown, with the slotted side facing up and towards
the front of the rack.
3. The stud should typically go through the center slot
(4th slot) on both purlins. Occasionally, the other slots
may need to be used to resolve foundation installation
errors.
4. The direction of the overlap (which zee purlin is on
top) is unimportant, and either order is acceptable.
Example zee purlin layout
NOMINAL SLOT
NOMINAL SLOT
ZEE PURLINS TO ROLL BRACKET
1. Ensure the stud goes through both zee purlins.
2. Secure with a nut. Fasten loosely.
3. Repeat at all locations for each N/S chord. There are
three (3) roll brackets and connections required per N/S
chord.
[3] EW ZEE PURLIN
[1] ROLL BRACKET ASSEMBLY
[10] 1/2-13 SERRATED FLANGE NUT
ZEE PURLINS-TO-N/S CHORD
1. The zee purlins should already be in the correct loca-
tion and loosely fastened by now.
2. Fasten the zee purlins to the N/S chord with a bolt and
nut. Ensure the bolt is facing down (to keep wire tray
clear). Fasten loosely.
Note: the lower slots are matched to the middle slots, so
there is no choice in slots at this points. See note about
nominal slots in the ZEE PURLIN STAGING step.
3. Repeat at all locations for each N/S chord. There are
three (3) connections required per N/S chord.
[11]
[2] NS CHORD
PRO TIP
12
1
3
10
10
11
2
3
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TITAN DUO
PAGE 12 - INSTALLATION MANUAL
TITAN DUO
OUTER
INNER
OUTER
INNER
MIDDLE
10
11
3
NOTE
Transverse braces are not for squaring the structure but
to minimize transverse movement (racking) and keep
the rack square. If the rack is not square to begin with,
rack is not square and further installation of the pan-
els will not be correct. Ensure transverse braces are in-
stalled prior to panels installation.
TRANSVERSE BRACE-TO-ZEE PURLIN
1. Install the transverse braces to the zee purlins at the
locations required per the construction plans. Braces
are always installed in sets of two (2); one pointing East,
and last purlin splice on each row, and at increments re-
quired per the plans.
2. Starting at the southern purlin splice (front), fasten
the transverse brace to the purlin through the out-
er-most lower slot of the zee purlin (slot #1 or #7). The
holes in the transverse brace must face up, but the ori-
-
ant. The correct hole in the transverse brace must also
be used. This is dependent on the location of the roll
bracket (inner or outer) and should be indicated on the
construction plans. If the roll brackets are installed in
the outer location, the outer-most holes at each end of
the transverse purlin are used. If the roll brackets were
installed at the inner location, the middle holes in the
transverse brace should be used.
3. Secure with a bolt and nut (ensuring the bolt is facing
down). Fasten loosely.
[3] EW ZEE PURLIN
[5] TRANSVERSE BRACE
[11]
[10] 1/2-13 SERRATED FLANGE NUT
11
10
3
Roll Brackets (and Zee Purlins) set to inner holes, use brace
inner holes
Roll Brackets (and Zee Purlins) set to outer holes, use brace
outer holes
TRANSVERSE BRACE-TO-ZEE PURLIN (CONTINUED)
4. Repeat at the opposite end of the transverse brace,
directing the brace away from the splice. There is a solo
through this hole using the outer or middle hole in the
transverse brace (same as step 2).
5. Finally, fasten the transverse brace to the middle zee
purlin using the middle hole of the middle set of holes in
the transverse brace.
6.
brace on the opposite side of the splice, and angle it in
the opposite direction.
7.
on the construction plans.
ZEE PURLIN-TO-ZEE PURLIN (SPLICE)
1. Splice the zee purlins together once the transverse
braces are installed and the purlins are attached to the
N/S chords.
2. Each splice should have four (4) additional bolts at
each location. Ideally, these should be at the outer-most
zee purlins.
3.
with a transverse brace, only the two (2) connections in
the center web are needed. If the N/S chord is located
at either outer-most hole, those splice bolts should be
connections in total.
4. Secure each with a bolt and nut. Fasten loosely
[3] EW ZEE PURLIN
[11]
[10] 1/2-13 SERRATED FLANGE NUT
PAGE 13 - INSTALLATION MANUAL
TITAN DUO
PAGE 14 - INSTALLATION MANUAL
TITAN DUO
14
14
3
PRO TIP
13
GRAVITY CLIP PREINSTALLATION
1. On the center zee purlin, install the gravity clip assem-
bly (midclamp assemblies with the gravity clip).
2. Refer to the construction documentation for the pre-
cise locations of where the gravity clip assemblies are
required. Two gravity clip assemblies are required per
panel (which are shared with the panel above or below
it).
3. Gravity clip assemblies should typically only be in-
stalled in the short keyslots (there are three short keys-
lots for each set. Refer to construction documentation
for correct slot usage).
4. Install by holding the assembly with the nut down to-
wards the zee.
5. Push the nut through the large hole in the keyslot,
and slide the assembly over until the two tabs on the
gravity clip engage with the two slots above and below
the keyslot. This keeps the gravity clip in place and pre-
vents rotation and movement in further steps.
6. If needed, rotate the midclamp so that the long side
aligns with the zee purlin. Do not tighten.
7. Install all remaining gravity clip assemblies for the
row.
[3] EW ZEE PURLIN
[14]
[14b] WEEB
[13] END CLAMP ASSEMBLY
PANEL INSTALLATION
1. Starting at one end, begin setting the pv modules. Re-
fer to the construction documentation to determine the
correct orientation of the panel (to correctly align the
junction boxes at the rear of the module).
2.
clip assemblies.
3. Stage the upper module directly above the lower
module, ensuring the module aluminum frame is against
result in the grounding teeth not engaging properly.
WARNING
DO NOT stage an entire row of modules. Only stage
enough modules required to properly adjust them
left to right (east to west). DO NOT leave modules un-
attended with untightened clamps, as wind may blow
Midclamps may be preinstalled from either side of the long
keyslot
13
14b
INCORRECT
CORRECT
PRO TIP
14
PANEL INSTALLATION (CONTINUED)
4.
5. Install an end clamp at the beginning, on both the top
and bottom modules, in the long keyslot. Keep loose.
6. Install midclamp assemblies (with the weeb washer)
on the inner edges of the top and bottom modules, typ-
ically in the long keyslots. Keep loose.
7. Continue staging modules and placing midclamp as-
semblies up to the reset point (the point which requires
more endclamps). Each time, stage the lower panel, then
upper module, then both midclamp assemblies.
8. Adjust the modules East to West until they are all
square.
9. Tighten the hanger clamp assemblies. One person
should push the lower and upper modules up slightly
so the module frame is against the side of the alumi-
num clamp (both the front and rear side). If the clamp
is above the module frame, tighten assembly slightly to
ensure frame does not touch the bolt/spring. Another
person must tighten the nut from below the rack.
10. Tighten the endclamp assemblies.
11. Adjust and tighten remaining modules, gravity clip
assemblies, and midclamp assemblies, each time en-
suring that all modules are tight against the aluminum
clamps both above/below and to the clamps to the sides.
12. Tighten endclamps. Ensure all grounding barbs are
engaged in the aluminum module frames.
13. Repeat steps 1-12 to the end of the row, in sections.
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7
8
CABLE BRACE-TO-ANCHOR POST
Depending on the array and project parameters, a set
of anchor posts may get multiple sets of cable braces
to limit movement and reduce fatigue. Refer to the con-
struction documentation for locations, and frequency of
cable bracing.
1. If clamps were not installed prior to installing the
tilt brackets (highly recommended), spread the clamp
apart, slide around the post, and re-compress it. Install
one clamp each on the North and South anchor posts.
2. Once clamps are installed, string a cable between the
two clamps (note: there may be multiple size cables on
one job, refer to construction documentation to use the
correct one).
3. Secure with bolts, loosely. Ensure that the bolts are
pointing to the interior of the rack.
4. Position one clamp slightly above the knee brace
clamp and fasten tightly.
5. Slide the opposite clamp as far as possible and fasten
the bolt tightly. Cables should be taut and have no no-
ticeable slack or sag.
6. Repeat for all remaining cables as indicated in the con-
struction documentation.
[7] ANCHOR POST
[8] CABLE BRACE
[16] CABLE CLAMP ASSEMBLY
NOTE
Cable braces are not used to induce static tension, like
trusses of a bridge, but instead only keep the posts
from spreading or shifting.
[8] -
mediately, ensuring debris or water doesn’t fall into the holes. If
this happens, a void can be created causing the piles to possibly
sink in the future.
[9] Use grip clamps when setting post transitions . This is the best
technique to use so that no improper dimpling is done to the posts
tighten the set bolts.
[10] Use a grip clamp to squeeze and close the brace clamp shut
while installing the set clamp bolt. Connect the knee brace to the
as the brace clamps are very ridgid.
[11] After the roll bars are installed and tightened, attach a string
line to the roll bar at the top of the N/S chord. Tie a string line to
every 4th roll bar (depending on topography), all the way to the
end of the row. This process will ensure that the zee purlin is in a
straight line. Fill in all remaining N/S chords to the string line. This
will ensure that the module installation will go smoothly and be
straight.
[12] Use a spud wrench to align key hole slots while installing the
overlapping zee purlins. Use a spud wrench/alignment punch to
pry onto the stud. At times, due to topography, the opposite side
of the zee purlin will have to be lifted in the air to properly seat
onto the previously installed zee purlin.
[13] When staging module clamps, tighten the bottom nut until
the spring is slightly compressed. This will help the module install-
er free up one hand. If the spring is not compressed prior to stag-
ing, the clamp will spin and another installer will have to hold the
panel.
[14]
top and bottom, up together with the strait edge. Align the top
and bottom with the purlin to ensure the modules are square with
the racking.
PRO TIPS
PRO TIPS are pieces of advice from installation experts. They are
intended to provide practical solutions to real-world problems
that you may encounter. But before implementing any of the be-
low tips, make sure to request approval from APA’s Engineering
team, as not all solutions are allowed on every site.
[1] It is best to use 2 sets of string lines when following this tech-
ground, and a second string placed at the top of the pile where
the collar of the pile driver stops and where the pile reaches em-
bedment.
[2] When dealing with extreme topography, additional transitions
[3] -
tances over the length of the row. Fiberglass can stretch over time
[4] With extreme topography, every pile must be marked and the
string line must be attached to every pile, in order to ensure that
[5]
which is often the case, addition movement can be made. The pile
exceeded, pile-to-pile spacing will have to be changed, potentially
purposes.
[6]
at the correct height, care should be taken to keep them within the
[7] Install the beginning, middle and end screw piles about 1/2 of
the way to depth (typically until threads are not showing). Then
attach a string line to these installed piles, creating a straight line
for the installation process. This will give the installer a guide and
ensure that the piles are plumb.
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TITAN DUO
OPERATION & MAINTENANCE
Regular inspections and proper maintenance are essential to maintain the design life and warranty of the TITAN so-
lar racking system. Solar racking is exposed to many elements from initial construction to seasonal changes and can
even be susceptible to severe weather conditions. The following Operation and Maintenance procedures should be
followed and performed on an annual basis to ensure the warranty for the racking system remains active. The pro-
cedures below highlight the critical points to be examined and maintained for a properly functioning solar racking
system.
BOLTED CONNECTIONS
Annually, bolted connections need to be visually inspected to ensure the components are properly joined together.
At the beginning, middle, and end of each row, there are torque marked nuts/bolts per the APA QA/QC process. These
SOLAR PANEL CLAMPS
Clamps need to be visually inspected annually to ensure modules are properly secured. If loose clamps are found,
GALVANIZE COATING
The galvanized coating ensures that the steel components are protected from corrosion and that the solar racking
system will last for the entire project life. Annually, the solar racking system should be inspected for any areas of cor-
rosion or rust. If areas are found, they should be repaired in a timely manner by cleaning the area and then generously
applying cold galvanizing compound.
The cut, slit and sheared edges of the racking system are exposed steel that are expected to show corrosion or rust.
Copper should be isolated and cannot touch the galvanized coating, as it will expedite corrosion.
CROSS BRACING CABLE WIRE
If applicable to your project, the bracing needs to be visually inspected on an annual basis to ensure that it has not
become loose. Cables are required to be taut for motion limiting, but do not need to be tensioned.
SYSTEM DAMAGE
The solar racking system should be visually inspected for other types of damage. Examples include damage from
mowing equipment, maintenance equipment, falling trees or branches, storm damage, system lean, soil erosion, etc.
Any components that are damaged or deformed should be replaced as they may be weaker or corrode faster than
intended. Some components may be able to be repaired onsite if replacement is not practical. For assistance with
replacement parts or instructions on repairing a component, contact APA.
GENERAL OPERATION
It is important to maintain the solar racking system to ensure the design lifespan.
Check that module cleaner solution, weed killer, or other chemicals used on or around the solar racking system are not
corrosive to galvanized or stainless steels.
Check electrical wiring to ensure it is managed properly and protected.
Take note and log when inspections were performed and if any corrective actions were taken or need to be taken in
the future.
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