Southwest Windpower Skystream Hybrid 6 User manual

Southwest Windpower, Inc.
1801 West Route 66
Flagstaff, Arizona 86001
Phone: ++ (1) 928 - 779 - 9463
Fax: ++ (1) 928 - 779 - 1485
www.windenergy.com
INSTALLATION MANUAL
NORTH AMERICA EdITION
The installer is solely responsible for complying with all
applicable building and electrical codes.
To help prevent stainless steel hardware from seizing together
(1) apply anti-seize lubricant to bolts, (2) keep hardware
shaded prior to installation, and (3) slowly fasten nuts during
installation.
© January 2012 Southwest Windpower, Inc.
All Rights Reserved
HYBRID 6

TABLE OF CONTENTS
IMPORTANT SAFETY INSTRUCTIONS __________________________________________ 5
SEQUENCE AND OVERVIEW OF INSTALLATION STEPS __________________________ 6
TOWER RING INSTALLATION__________________________________________________ 8
TAPERED RING AND GEAR INSTALLATION ____________________________________ 10
SUPPORT SHELL INSTALLATION _____________________________________________ 11
CROSS ARM STRUCTURE ASSEMBLY AND INSTALLATION ______________________ 13
MOTOR/GEARBOX INSTALLATION____________________________________________ 14
ALIGNMENT AND CHAIN INSTALLATION ______________________________________ 14
SOLAR PANEL AND MICRO-INVERTER INSTALLATION__________________________ 16
FINAL CABLE CONNECTIONS _______________________________________________ 18
APPENDIX A: ELECTRICAL DIAGRAMS _______________________________________ 21
Skystream Hybrid 6TM Installation Manual
3-CMLT-1101
Revision: A

The hybrid energy sun tracker is delivered in two packages. One pallet contains the shell assemblies and three boxes of hardware. The boxes of hard-
ware are packaged inside of the shell assemblies. The second package will be a 6” X 6” x 11’ box containing four rails and brackets, as well as the cable
support.

Skystream Hybrid 6TM Installation Manual, Rev A 5
IMPORTANT SAFETY INSTRUCTIONS
READ THESE INSTRUCTIONS IN THEIR ENTIRETY BEFORE INSTALLING OR OPERATING.
GENERAL INSTRUCTIONS
1) SAVE THESE INSTRUCTIONS. This Owner’s Manual and the associated
Owner’s Manual contain important instructions that must be followed during
installation, maintenance, and use.
2) The Skystream Hybrid 6TM system uses and generates high voltage AC and
DC electricity that could cause major injury or death. As a result, only trained
personnel should work on the system. Observe safety precautions at all times.
Use “Lock-Out” and “Tag-Out” procedures during servicing to prevent unintend-
ed exposure to electricity.
3) The Hybrid 6TM system includes exposed and moving parts that move periodi-
cally and unexpectedly. As a result, access to the Skystream Hybrid 6TM system
must be restricted. Systems that are mounted at heights within reach of indi-
viduals should be fenced to avoid interference, injury, or collisions by passing
individuals or equipment. Systems should also be fenced or otherwise restrict-
ed if there is a risk of uninformed people climbing or using ladders to touch or
disturb the system.
4) The Skystream Hybrid 6TM must be mounted at heights that comply with all
local building codes and that are within the structural capabilities of the tower.
The maximum clearance (height) from the surface of the lower tower flange (at
the foundation) to the lower edge of the solar panel array is as specified in the
table below. If in doubt, consult your dealer or Southwest Windpower
Tower Maximum Clearance (Height) Between Lower
Tower Flange and Lower Edge of Solar Panel
SWWP 45-19 “Standard” 4 feet (1.2m)
SWWP 45-19 HD (Heavy Duty) 8 feet (2.4m)
5) Properly complete and return all warranty registration cards. Failure to do so
may affect your warranties.
6) Do not use unauthorized fasteners. Use fasteners supplied with the Hybrid 6TM
system.
7) Maintain tightness of fasteners according to torque requirements (see
Maintenance and Inspections).
PROFESSIONAL INSTALLATION: Southwest Windpower strongly
recommends Skystream Hybrid 6TM be installed by trained
professionals. Proper installation is required to maintain your warranty.
INSTALLATION INSTRUCTIONS
1. Installation must be performed by trained personnel who are familiar with and
capable of handling heavy mechanical equipment and high voltage AC and DC
electricity.
2. Always obtain a building permit prior to construction.
3. Skystream Hybrid 6TM must be installed in accordance with the Skystream
Hybrid 6TM Installation Manual and local and national building codes. Failure to
do so will affect and possibly void your warranties.
4. Installation must be performed in compliance with the National Electric Code
(NEC) and all local building codes.
5. Use only proper grounding techniques as established by the NEC as well as
electrical disconnect switches, wire sizes and types.
6. Install the Skystream Hybrid 6TM system on a calm day with negligible wind at
ground level. Solar panels will experience strong forces in windy conditions.
7. Use proper hydraulic hoists, cranes, or other lifting equipment to safely lift
Skystream Hybrid 6TM components or systems.
8. Always wear appropriate protective personal equipment such as closed toe
work shoes, hard hat, work gloves, and safety glasses when working on or
installing the Hybrid 6TM system.
9. The Skystream Hybrid 6TM system complies with international safety standards.
Therefore, the design and its installation must never be compromised:
a. Do not open inverter covers. Doing so without factory authorization will
void the warranty.
b. Apply the proper torque to all fasteners.
c. Install only on a Professional Engineer (PE) certified tower.
10. Skystream may only be installed on a tower approved by Southwest
Windpower for use with the Skystream Hybrid 6TM system. Do not install
Skystream Hybrid 6TM on roofs or unauthorized towers.
11. Do not use unauthorized fasteners. Use fasteners supplied with Skystream
Hybrid 6TM.

6 Skystream Hybrid 6TM Installation Manual, Rev A
Sequence and Overview Of inStallatiOn StepS
Installation of the PV tracker portion of the Skystream Hybrid 6TM system
includes the following basic sequence of steps. Please refer to the rel-
evant manual for each step – for example, the tower and hinge plate/gin
pole system has its own installation manual, as does the Skystream 3.7TM
wind generator.
1. Properly locate/site the Skystream Hybrid 6TM system. Proper site
selection requires consideration of the system’s access to both clear
flow wind and to un-shaded sun. Other considerations include access
to the site, the wire run path between the system and the electrical
connection point, and safety hazards.
For the Skystream Hybrid 6TM system to function properly and to its full
potential, the system must be installed in a location with suitable wind
and solar energy potential. Wind turbulence sources must be avoided,
as should any potential source of solar shading. Consideration must be
given to both current and future conflicts, such as mature tree height or
future construction plans. Please refer to both the Skystream 3.7TM and
the Skystream Hybrid 6TM Owner’s Manuals for important information.
2. Install an appropriate tower foundation, grounding electrode, and elec-
trical wiring or conduit. Please refer to the appropriate tower and foun-
dation manuals for sizing information and foundation drawings. In most
cases, your local AHJ (Authority Having Jurisdiction) will require a “wet
stamped” set of foundation plans. A “wet stamped” plan is reviewed and
stamped, with an original seal, by a PE (Professional Engineer) who
is licensed in your state or province. As they are jurisdiction specific,
Southwest Windpower does not provide these “wet stamped” plans but
they can be obtained from Tower Engineering Professionals or a quali-
fied local PD.
In most cases, a sub-panel must be installed at or near the base of
the tower. The installer should make provisions for this sub-panel in
both the wire/conduit routing and in providing a suitable support for
the sub-panel. From this sub-panel, wiring or conduit must be run in
the shortest practical path to a suitable electrical connection point. In
most cases, this connection point will be the main service panel. In any
event, it should be as close as possible to the point where the electri-
cal system of the supplier and the electrical system of the user are
connected (the location where service voltage is measured, per ANSI
C84.1). Connection of the Skystream Hybrid 6TM electrical wiring to
any other point (such as an outbuilding’s sub-panel or other remote
panel) requires additional analysis of the entire wire run’s impedance
and, normally, requires increased wire sizes to prevent excessive voltage
rise during system operation. This analysis is the responsibility of the
dealer/installer, using the services of a qualified electrical engineer or
electrician.
3. Assemble the tower, hinge plate and gin pole system, and solar tracker
mounting rings (hereinafter referred to as the tower rings). Please refer
to the appropriate tower manual for instructions regarding the proper
assembly of the tower. A sectional tower which is not properly assem-
bled, using specified compression techniques and forces, may wobble
and cause degraded wind turbine performance.
The center opening in the tower rings is large enough to slide over the
top flange of a completely assembled 45-19 or 45-19HD tower. But,
for convenience, it may be easier to slide them onto the lower sec-
tion of the tower and weld them in place before assembling the upper
sections. A wire pass-through hole must also be drilled in the tower
sidewall and it is normally easier to install that before the tower is
completely assembled. After welding the rings in place, but before the
next step (installing the Skystream 3.7TM), the solar tracker top cover
must be slid into position. Refer to the detailed instructions, later in this
manual, for specific information on this process.
4. While the tower is lying down (but properly supported) assemble, install,
and check functionality of the Skystream 3.7TM components (including
the Skylevel, cabling, and turbine).
5. Assemble and install the solar tracker drive mechanism, module support
rails, PV modules, microinverters, and wiring. The solar tracker can be
installed on the tower rings with the tower lying down (but properly sup-
ported) or when standing upright, as preferred by the dealer/installer.

Skystream Hybrid 6TM Installation Manual, Rev A 7
In most cases, it will be easier to install the solar tracker before stand-
ing the tower upright and the 45-19/45-19HD tower lifting mecha-
nisms are suitable for raising the tower with the Skystream 3.7TM and
the solar tracker installed. If the solar tracker is installed on a tower in
the upright position, appropriate lifting equipment and worker supports
are required.
6. Make final wire connections in the sub-panel at the tower base and at
the main connection point, then test the system.

8 Skystream Hybrid 6TM Installation Manual, Rev A
tOwer ring inStallatiOnS
The Skystream Hybrid 6TM solar tracker drive unit is mounted to the tower on
two tower rings, which are tack welded to the tower and which are aligned
(during the installation process) with the 3 steel rods of the ring welding
alignment jig – Part # 2-SSH-222. The alignment jig is a separate dealer-
required item, which is not included with each Skystream Hybrid 6TM system
as it is re-used on multiple installations. Do not attempt to install the tower
rings without the use of the alignment jig, as the proper spacing and parallel
alignment of the rings is critical to the proper operation of the system.
Normally, the following steps would take place with the first tower section
attached to the foundation with the hinge plate and while the first tower
section is properly supported with cribbing or other suitable and stable
support. In some cases, the dealer/installer may elect to perform these
steps on a tower which is in the vertical position (such as a retrofit instal-
lation) or before the tower sections are transported to the site (if welding
equipment is not available at the installation site). In such cases, the fol-
lowing instructions may need to be modified slightly to meet the demands
of the altered installation conditions. If the tower rings are welded to the
lower tower section before transportation to the site, it is important to pro-
tect those rings from damage during transport and installation.
1. From the bottom of the tower’s base flange, measure up (towards the
upper end of the tower’s first section) and mark the North side of the
tower with a permanent marker.
For installation on a 45-19HD tower, with 8-feet of clearance between
the tower base flange and the lowest point of the PV array, make a
mark 154 inches from the bottom of the base flange.
For installation on a 45-19 tower, with 4-feet of clearance between the
tower base flange and the lowest point of the PV array, make a mark
106 inches from the bottom of the base flange.
This mark will be used to locate the wire penetration hole.
2. Examine the two tower rings and ensure they have not been damaged
or bent during shipping or handling. It is important that the rings are
flat. Note that one ring has a larger inside diameter than the other
ring. The ring with the larger inside diameter will be the bottom ring, to
accommodate the tapering of the tower.
3. Locate the 3 larger holes drilled in the tower rings – these holes are
used for the welding alignment jig during the installation process. Align
the three metal rods of the alignment jig between the two tower rings.
It is easiest to do this one rod at a time. Using the hardware which
came with the jig, bolt the alignment rods into place (utilizing the three
holes you identified earlier) so that the tower rings are properly spaced
and aligned.
4. Slide the two rings, attached to the alignment jig, over the top of the
tower making sure that the ring with the larger inside diameter is ori-
ented closest to the tower base. Push this assembly towards the base
of the tower until it is snug and the inside of the tower rings are resting
against the sidewalls of the tower. Check the position of the rings rela-
tive to the hole mark you made in step 1. The top ring should be about
6 inches below the hole mark you made. If necessary, the inside of the
tower rings can be filed or ground slightly to accommodate an out-of-
round tower or to position the ring assembly so that there is approxi-
mately 6 inches of clearance between the top ring and the hole mark.
5. Using a permanent marker, mark the tower sidewalls at every point
where the inside of the upper and lower tower rings contact the tower
(on both surfaces of the tower rings). These contact marks will be
used to indicate where galvanizing should be ground from the tower to
permit welding.

Skystream Hybrid 6TM Installation Manual, Rev A 9
6. Slide the jig up, towards the top of the tower, to provide access to the
contact marks you just made. Using a suitable grinder, remove the gal-
vanizing from the surface of the tower sidewall at the locations of the
contact marks. Remove only enough surface material to permit proper
tack welding of the tower rings to the tower.
7. Slide the jig and tower rings back into place and check the fit. Once
proper fit and location is confirmed, tack weld the upper and lower sur-
faces of each ring to the tower. Welding should not be performed with
any wiring inside the tower, to avoid heat damage to the wire’s insula-
tion. Once the welding has cooled, remove any splatter which might
have landed on the surfaces of the tower rings. Brush or spray the
welded areas with a protective coating such as ZRC Cold Galvanizing
Compound (or equivalent).
8. Remove the welding alignment jig rods and store that kit for future use.
9. Using the hole mark you made earlier, and ensuring that it is located
on the North side of the tower, drill a hole for your cord grip or strain
relief fitting. The diameter of the hole will depend upon the size of your
specified electrical cable and your grounding wire, and the fitting you
select. In most cases, the hole diameter need only be large enough
to permit the installation of the threaded or snap-in fitting (typically 1
inch). If using a threaded fitting, which is the most commonly accepted
type, it may be necessary to tape the nut and a suitable wrench to a
4-foot extension pole with which you can reach the hole location from
either the top of the tower section (for a 45-19HD) or the bottom of
the tower section (for a 45-19).
In some cases, your AHJ may require a female fitting welded to the
tower (as shown here) in which case the drilled hole diameter may be
as large as 1 3/8 inches:
If a welded nipple is required by your AHJ, the solar tracker top cover
should be slid into place between the welded rings and the nipple loca-
tion before the nipple is welded into position.
This wire penetration hole, in the location/s described, is acceptable
and will not affect your tower warranty. But, other holes (especially any
in the bottom 5 feet of the tower) are not permitted.

10 Skystream Hybrid 6TM Installation Manual, Rev A
tapered ring and gear inStallatiOn
1. Disassemble the two shell assemblies by removing the 10 screws/
washers that are located on both sides of the assemblies. Save hard-
ware for later use. See Figure 1.
2. Install four of the eight tapered rings to the bottom-side of the upper
tower ring. Use four ¼”-20 X 7/8”L bolts, lock washers, and flat wash-
ers (from the tapered ring/gear mounting hardware) for each tapered
ring. See Figure 2. After tightening, the four tapered rings should fit
flush to each other without gaps.
3. Install the remaining four tapered rings to the top-side of the lower
tower ring. Use ¼”-20 X 7/8”L bolts, lock washers, and flat wash-
ers on the two ends of each Tapered Ring as shown in Figure 3. The
middle two hole locations should be left vacant for now.
4. Install the two sun tracking gears to the bottom-side of the lower
ring. Ensure the spacers on the gears are facing up. Use four ¼-20
X 1-3/4”L bolts, lock washers, and flat washers for each gear. See
Figure 3.
Figure 1
Figure 2
Figure 3

Skystream Hybrid 6TM Installation Manual, Rev A 11
SuppOrt Shell inStallatiOn
5. On each of the three top tapered rollers on the sun side support shell
assembly, loosen the jamb nut and adjust the tapered roller axle until
the tapered rollers are against the frame. Hand-tighten the jamb nuts.
6. Carefully lift the assembly onto the tower (ensure the assembly is ori-
ented with the adjustable rollers toward the top of the tower). Using
the two slots provided, temporarily strap the assembly to the tower (be
sure to keep the ratchet for the strap on the outside of the assembly
for easy removal. See Figure 4.
7. Loosely re-insert a 5/16”-18 X ¾” screw (no washers) into the center
hole on each side of the cross arm side support shell assembly. This
will help guide the assemblies into alignment.
8. Adjust the tapered rollers on the cross arm side support shell assem-
bly until they are against the frame.
9. Lift the assembly onto the tower (ensure the assembly is oriented
with the adjustable rollers toward the top of the tower). Connect the
shell assemblies by inserting and tightening the remaining 5/16”-
18 screws, lock washers and flat washers. Reinstall the two center
screws with flat and lock washers. See Figure 5.
10. Remove the temporary strap from the sun side support shell assembly.
Figure 4
Figure 5

12 Skystream Hybrid 6TM Installation Manual, Rev A
11. Adjust the top eight (8) tapered rollers by loosening the jamb nuts,
and adjusting the threaded axles. Adjust the tapered rollers such that
the threaded axles protrude the same distance from the frame. See
Figure 6. There should be minimal play between the shell assembly
and the tower after tightening. If too much play still exists, re-adjust
all rollers the same amount. Tighten the jamb nuts once all rollers are
adjusted. Confirm the shell assemblies roll freely around the tower.
12. Install the hard stop bracket using the parts in the hard stop hardware
package. Attach the bracket to the bottom of the frame as shown in
Figure 7. Use two ¼”-20 X ¾” bolts, flat washers and lock washers.
NOTE: The 3/8”-16 X 1-1/4” stop-bolt can be used during
assembly or maintenance to lock the tracker in place.
Figure 6
Figure 7

Skystream Hybrid 6TM Installation Manual, Rev A 13
crOSS arm Structure aSSembly and inStallatiOn
13. Center the 6” X 6” cross arm tube onto the cross arm side support
shell assembly. Ensure the hole pattern on the cross arm tube lines
up with the hole pattern on the support shell assembly. Install the
beam clamp bracket on the cross arm tube using four ½-13 bolts,
flat washers, lock washers and hex nuts from the cross arm mounting
hardware package. See Figures 8 & 9.
14. Install the four cross arm/wing mounting brackets onto the cross arm
tube using the ½”-13 X 7-1/2” bolts, flat washers, lock washers, and
hex nuts with the cross arm/wing mounting plates. The brackets
should be located and oriented as shown in Figure 8 (dimensions
shown are for Motech 235W solar panels). Temporarily leave the
bolts loose.
15. Install the two solar panel/inverter support rails onto the mounting
brackets closest to the sun tracker assembly. Ensure the rails are
oriented as shown in Figure 8. Attach using seven 3/8”-16 X 1-1/4”
bolts, flat washers and nuts on each rail.
16. Attach the cable support to the rails using 5/16” X 7/8” bolts, flat
washers, lock washers and hex nuts. See Figure 8. Once installed,
verify the location of the cross arm/wing mounting brackets and
tighten the ½”-13 X 7-1/2” bolts for the two inner rails that were left
loose in Step 14.
17. Install the two solar panel support rails onto the mounting brackets
furthest from the sun tracker assembly. Ensure the rails are oriented
as shown in Figure 8. Attach using seven 3/8”-16 X 1-1/4” bolts, flat
washers and nuts on each rail. Leave the remaining ½”-13 X 7-1/2”
bolts loose until the solar panels have
been installed.
Figure 8
Figure 9

14 Skystream Hybrid 6TM Installation Manual, Rev A
mOtOr/gearbOx inStallatiOn
18. Remove the enclosure cover by removing the two cover bolts. Place
the motor/gearbox in the enclosure as shown in Figure 10. Loosely
insert the four 5/16”-18 X 5/8” bolts, flat washers and lock washers
from the motor/gearbox hardware. Install the chain tensioning bolt
(5/16”-18 X 2-1/4”) and flat washer (do not tighten).
19. The solar tracker top cover must be slid into place and installed prior
to installing the Skystream 3.7TM onto the top of the tower. Once the
turbine is installed, it will not be possible to slide the solar tracker top
cover into position. After sliding the top cover into position, above
the upper welded ring but below the wire penetration hole or welded
nipple (if used), it can be left loose until final assembly of the solar
tracker. After fully assembling and orienting the solar tracker, the top
cover should be slid downwards and the stainless steel band clamp
should be tightened to keep it in position. The cover’s perimeter edge
lip, facing downwards, should overlap the top edge of the solar tracker
assembly approximately 1/2 inch.
alignment and chain inStallatiOn
19. Prior to installing the chain, the solar panels must be facing true South
(if in the Northern Hemisphere) prior to power-up. True South dif-
fers from magnetic South. In order to find true South, the magnetic
declination for the installation location must be found. The magnetic
declination value represents the error between magnetic North and
True North for a specific location. This value can be represented as an
easterly (positive (+)) declination, or a westerly (negative (-)) declina-
tion. There are two ways to find the magnetic declination:
1. Go to: http://www.ngdc.noaa.gov/geomagmodels/Declination.
jsp, enter the zip code for the installation location and click “Get
Location.” Then click “Compute Declination” and find the declina-
tion in the lower box.
2. Looking at the following chart, use the blue and red lines to find
the approximate magnetic declination for the installation location.
These values vary slightly from year to year, but this chart is suf-
ficient for an approximate value.
MAGNETIC DECLINATION FOR THE U.S. - 2010
Contour Interval: 1 Degree (Positive declinations in blue, negative in red)
Figure 10

Skystream Hybrid 6TM Installation Manual, Rev A 15
20. Using a compass, find magnetic North. Adjust the compass by the
magnetic declination value (while the needle stays at magnetic North,
rotate the compass counter-clockwise for easterly (+) declinations,
and clockwise for westerly (-) declinations. See Figure 11.
21. Rotate the sun tracker assembly until the solar panels are facing true
South (180º from true North).
Figure 12
22. Install two spacers, 3/8”-16 X 1-1/2” bolts, and hex flange lock nuts
(from the hard stop hardware package) on the tower gear in the loca-
tions shown. See Figure 12.
23. Install the chain around the tower gear and motor sprocket by install-
ing the master link and attaching the clip. See Figure 10.
24. Ensure the assembly is still aligned with true South, and tighten chain
tension. Check that chain play is similar on both sides of the sprocket.
Once desired tension is reached, tighten the four motor/gearbox bolts
located underneath the frame assembly to lock in place. See Figure 10.
25. Install the sun tracker cover assembly to the tower, above the
sun tracker assembly. Tighten using the pipe clamp, and install
the two screws.
19. Prior to installing the chain, the solar panels must be facing true South
(if in the Northern Hemisphere) prior to power-up. True South dif-
fers from magnetic South. In order to find true South, the magnetic
declination for the installation location must be found. The magnetic
declination value represents the error between magnetic North and
True North for a specific location. This value can be represented as an
easterly (positive (+)) declination, or a westerly (negative (-)) declina-
tion. There are two ways to find the magnetic declination:
1. Go to: http://www.ngdc.noaa.gov/geomagmodels/Declination.
jsp, enter the zip code for the installation location and click “Get
Location.” Then click “Compute Declination” and find the declina-
tion in the lower box.
2. Looking at the following chart, use the blue and red lines to find
the approximate magnetic declination for the installation location.
These values vary slightly from year to year, but this chart is suf-
ficient for an approximate value.
MAGNETIC DECLINATION FOR THE U.S. - 2010
Contour Interval: 1 Degree (Positive declinations in blue, negative in red)
Figure 12
Figure 11

16 Skystream Hybrid 6TM Installation Manual, Rev A
Component configuration/layout should, normally, meet the specifications
of this reference diagram – as always, however, your local AHJ may modify
these or may impose additional requirements:
1. Using the mounting brackets supplied with the six micro-inverters,
mount them onto the solar panel/inverter support rails using the
5/16”-18 X ¾” hardware as shown here. Also, see Figures 13 & 14.
SOlar panel and micrO-inverter inStallatiOn
Figure 13

Skystream Hybrid 6TM Installation Manual, Rev A 17
2. Attach six solar panels to support rails as shown. Rails may need to
be adjusted depending on solar panel mounting hole locations. To
meet the requirements of the NEC article 690.43 (and the referenced
articles 250.134 or 250.136(A)), either WEEB Ground Washers or a
ground conductor or both (as required by your local AHJ and permit-
ting/inspection officials) must be used as well. Tighten all solar panel
and rail hardware when panels and rails are in the correct positions.
See Figures 13 & 14.
The PV modules which came with your Skystream Hybrid 6TM, and the
included Enphase micro-inverters, all have compatible Tyco Solarlok
connectors. The PV module connectors simply plug into the Enphase
micro-inverter input connectors.
Install the two WEEBL ground lugs to the rails in the locations shown,
and route the ground cable (#6 AWG) as shown. See Figures 13 &
14 (detail A).
3. Connect and route the Enphase AC micro-inverter cable as shown in
Figure 13. Terminate the cable end with the Enphase branch terminator.
4. Mount a water resistant single gang junction box to use for the AC
connection from the Enphase Engage AC cable to the downtower
AC cable (which passes through the fitting you installed in the tower).
The junction box should be mounted to one of the solar panel support
rails. The size and type of box will vary depending upon local require-
ments, but a typical installation includes a readily-available single-gang
box as shown here:
Figure 14

18 Skystream Hybrid 6TM Installation Manual, Rev A
5. Included in the system kit is a suitable length of Enphase Engage
cable, which has connection points for the micro-inverter grid connec-
tions. One end of the cable will be capped with a weatherproof cap,
using the included cable termination kit. See the applicable Enphase
instructions, included with the inverters and cable kit, for details on
how to cut and terminate the cable
1. Connect solar panels to the appropriate micro-inverters. Connect the
tracker controller “T” connections between the middle solar panel and
the micro-inverter. See Figure 13. Ensure a drip loop is provided
where cables enter the sun tracker shell.
2. Secure all cables using cable ties where appropriate.
3. Run a ground cable and an AC cable through the strain relief or fitting
to the base of the pole. Make connections in the base of the pole.
A normal new installation will have a sub-panel at the base of the
tower, so that the Skystream 3.7TM turbine-to-sub-panel wire run is no
longer than 55 feet. In this case, the Skystream 3.7TM wiring can be
#10 AWG or #8 AWG and of a type required by local codes. The wir-
ing from the PV inverter junction box (mounted on the solar tracker) to
the sub-panel can be #12 AWG and of a type required by local codes.
The sub-panel at the tower base will contain two double-pole break-
ers. The Skystream 3.7TM circuit is protected by a 20A breaker and
the PV circuit is protected by a 15A breaker.
The copper conductors between the sub-panel and the main panel
connection point should be sized, at a minimum, based on the follow-
ing chart:
final cable cOnnectiOnS

Skystream Hybrid 6TM Installation Manual, Rev A 19
4. Make the connections at the system disconnect, optional meter, and
at the main panel connection point (circuit to be protected by a 40A
double pole breaker).
5. Remove Stop Screw if installed.
6. Re-install the enclosure cover and cover bolts that were removed in
Step 18.
7. Ensure the tracker controller switch is in the “OFF” position, and con-
nect the motor cable to the connector coming from the control enclo-
sure. Turn the switch to the “ON” position.
CAUTION – MOTION: The controller super-capacitors will begin
to charge up once the solar panels are connected to the control-
ler. After the controller switch is turned “ON” and a GPS signal
is acquired, the controller calculates the sun position, and track-
ing will begin. Tracking motion occurs on the 10-minute mark.
(The tracker will return to South at low power conditions. (AC
does not have to be connected for tracker operation).

20 Skystream Hybrid 6TM Installation Manual, Rev A