NRG Systems 11174 User manual

Soiling Measurement Kit
NRG SRA System | Kit #11174
Authors:
Technical Services

NRG INSTRUCTIONS
SRA System | Soiling Measurement Kit
SRA Soiling Measurement Kit Instructions
Rev. 6.0
[e-mail] | Page 2
1 November 2017
TABLE OF CONTENTS
INTRODUCTION 4
MATERIALS & TOOLS 4
Inside the Kit................................................................................................................. 4
Required Tools.............................................................................................................. 4
SECTION 1: ASSEMBLING THE SOILING MEASUREMENT KIT 5
1.1 Open and unpack all items. ..................................................................................... 5
1.2: Mount upper U-bolt to tower, ................................................................................ 6
1.3: Mount PV panel assembly to upper U-bolt.............................................................. 7
1.4: Attach the angle adjustment boom to PV assembly. ............................................... 8
1.5: Mount the angle boom to the tower....................................................................... 9
1.6: Adjust the PV panel angle..................................................................................... 10
1.7: Secure & tighten all hardware. ............................................................................. 11
SECTION 2: WIRING AND MOUNTING THE INTERFACE MODULE 12
2.1: Connect the 4C cable. ........................................................................................... 12
2.2: Mount DIN rail to shelter box back plate............................................................... 13
2.3: Wire the PV panels to the interface modules. ....................................................... 13
2.4: Mount the IMT Tm-V-4090 Temperature Amplifier Boxes. .................................... 14

NRG INSTRUCTIONS
SRA System | Soiling Measurement Kit
SRA Soiling Measurement Kit Instructions
Rev. 6.0
[e-mail] | Page 3
1 November 2017
2.5: Connect PV panel to the SymphoniePRO logger & iPack........................................ 14
2.6: Affix Interface Module to DIN rail & wire snesor signals to the logger wiring panel.15
2.7: Reconnect wiring panel to the logger.................................................................... 16
SECTION 3: LOGGER PROGRAMMING & CONFIGURATION 17
3.1: Programming the SymphoniePRO logger. ............................................................. 17
Temperature Clean: 17
Temperature Soiled: 18
IscClean: 18
IscSoiled: 19
3.1.2 Scale Factors and Offsets Summary 19
3.1.3 Saving the Channel Configuration 20
SITE MAINTENANCE 20
DATA PROCESSING 20

NRG INSTRUCTIONS
SRA System | Soiling Measurement Kit
SRA Soiling Measurement Kit Instructions
Rev. 6.0
[e-mail] | Page 4
1 November 2017
INTRODUCTION
This document explains how to integrate the Soiling Measurement Kit onto NRG Systems’ SRA tower.
The process includes assembling and installing hardware to the tower and shelter box, wiring the system
to the logger, and configuring the logger channels to read the signals. The Soiling Measurement Kit can
be installed on any NRG Systems Solar Resource Assessment (SRA) tower equipped with a
SymphoniePRO logger.
It is recommended that two people perform this installation.
MATERIALS & TOOLS
Inside the Kit
PV panel assembly
Angle adjustment boom
U-bolts & mounting brackets
Interface Module, DIN rail, & wiring cable
Required Tools
3/16” hex key
5/32” hex key
7/16” combination wrench
3/4” combination wrench
Small flathead screwdriver
Small diagonal cutters or snips
6ft stepladder
Elevation angle meter
Compass or GPS (Required for initial SRA tower orientation, optional for panel orientation)
Electrical tape
Documentation equipment (Camera, pen, & paper)
Windows PC with SymphoniePRO Desktop Software loaded, USB cable type-A to type-B
Gloves
Loctite 242 (optional)
Digital Voltmeter (optional)
Wire strippers (optional)

NRG INSTRUCTIONS
SRA System | Soiling Measurement Kit
SRA Soiling Measurement Kit Instructions
Rev. 6.0
[e-mail] | Page 5
19 December 2018
SECTION 1: ASSEMBLING THE SOILING MEASUREMENT KIT
1.1 Open and unpack all items.
Verify that all contents are present and undamaged. Leave PV panel assembly inside the box for now to
prevent the panels from getting scratched.
Figure 1-1: Packaged Soiling Measurement Kit

NRG INSTRUCTIONS
SRA System | Soiling Measurement Kit
SRA Soiling Measurement Kit Instructions
Rev. 6.0
[e-mail] | Page 6
19 December 2018
1.2: Mount upper U-bolt to tower,
Mount upper U-bolt (Figure 1-2, right) and bracket near the top of the NRG SRA tower using the 3/4”
wrench (Figure 1-3). Make sure that the 7/16” bolt heads are facing down and the slide nuts are facing
upwards. Do not overtighten the U-bolt nuts.
Note: The lower U-bolt will be mounted to the tower approximately 15” below the upper U-bolt later.
Verify that there is space on the tower tube at this location for the lower U-bolt.
Figure 1-2: U-bolts and brackets, lower (left) & upper (right)
Figure 1-3: Mounting the upper U-bolt

NRG INSTRUCTIONS
SRA System | Soiling Measurement Kit
SRA Soiling Measurement Kit Instructions
Rev. 6.0
[e-mail] | Page 7
19 December 2018
1.3: Mount PV panel assembly to upper U-bolt.
If desired, remove the slide nuts and add Loctite to the threads. Allow to dry slightly, then reattach slide
nuts to the bolts, leaving them loose.
Otherwise, loosen the slide nuts on the upper U-bolt bracket so they are flush with the end of the bolts
(Figure 1-4).
Figure 1-4: Slide nuts (circled) on the upper U-bolt bracket.
Remove the PV panel assembly from the box and slide the short, hinged section of mounting rail onto
the slide nuts (Figure 1-5). Use 2 people if possible.
Figure 1-5: Mounting PV panel assembly to bracket using slide nuts.

NRG INSTRUCTIONS
SRA System | Soiling Measurement Kit
SRA Soiling Measurement Kit Instructions
Rev. 6.0
[e-mail] | Page 8
19 December 2018
Center PV panel assembly and tighten mounting bolts with the 7/16” wrench (Figure 1-6). Do not
overtighten bolts.
Figure 1-6
1.4: Attach the angle adjustment boom to PV assembly.
Attach angle boom to the lower mounting rail of PV assembly approximately 4.5” from the left side of
the rail (Figure 1-7).
The bolts holding the hinge to the end of the angle boom must be loosened slightly in order to pivot the
hinge. Loosen the slide nut on the end of the hinge enough to mount it to the rail. The slide nut is
inserted into the channel opposite of the PV panels. Once in position, tighten the bolt inside the hinge
with a 3/16” hex key. Allow the angle boom to pivot freely for the time being.
Figure 1-7

NRG INSTRUCTIONS
SRA System | Soiling Measurement Kit
SRA Soiling Measurement Kit Instructions
Rev. 6.0
[e-mail] | Page 9
19 December 2018
1.5: Mount the angle boom to the tower.
Disassemble the lower U-bolt assembly but leave slide nut/bolt attched through the outer bracket
(Figure 1-8).
Figure 1-8
Remove the rubber angle boom end cap and insert slide nut/bolt/bracket into channel opposite the SRA
tower. Tighten bolt slightly to keep bracket at approximately 3” from the end of the hinge (Figure 1-9).
Figure 1-9
Measure 15” down the tower from the upper U-bolt. Mark measurement with permanent marker if
desired (Figure 1-10).

NRG INSTRUCTIONS
SRA System | Soiling Measurement Kit
SRA Soiling Measurement Kit Instructions
Rev. 6.0
[e-mail] | Page 10
19 December 2018
Attach lower U-bolt to the tower at this location and 90 degrees clockwise of the upper U-bolt. Insert
inner bracket and spacers onto the ends of the U-bolt. Place outer bracket and angle boom through the
ends of the U-bolt (Figure 1-9). Tighten nuts with 3/4” wrench. Do not overtighten.
Figure 1-10: Location of lower U-bolt measured from the upper U-bolt.
1.6: Adjust the PV panel angle.
Adjust the panels to your desired angle using the angle boom and verify with angle finder (Figure 1-11).
If the boom does not slide freely, then bolts in the system may be too tight. Ensure that the bolts are
loose enough to allow movement.
Figure 1-11