Campbell Scientific CR-PVS1 PV Soiling Loss Index RTU Quick Deploy Owner Manual

Campbell Scientific CR-PVS1 PV Soiling Loss Index RTU Quick Deploy Owner Manual
QUICK DEPLOY GUIDE
System Overview
3
Reference Panel
(Clean)
CR-PVS1
Test Panel
(Dirty)
Physical Deployment
3.1
3.2
PV Soiling Loss Index RTU
3.3
3.4
3.5
a.
b.
Document Part Number: 33045
Revision Date: July 2019
Info
Link
Reference 110PV Sensor
c.
Test 110PV S ensor
Maximum panel cable length is 10 ft.
(12–14 AWG)
d.
IMPORTANT NOTE: This Quick Deploy Guide is a general installation
reference. Refer to the Owner’s Manual for detailed installation
instructions and information.
1
!
Reference Panel
Caution!
To prevent injury, completely cover the panels during installation to limit output
current and voltage. Do not short the solar panel (+) and (–) leads together.
2
Install the CR-PVS1 near the Test and Reference panels. The length of the solar
panel wires should not exceed 10 feet. Connect the ground lug to earth ground.
Using the stickers supplied with the CR-PVS1, identify one panel as Test and the
other as Reference. Do the same with the two temperature sensor cables by
writing on the white band near the cable end.
Route the Test panel sensor cable to the enclosure. Use cable ties to attach the
cable to the panel framework, but do not tighten them yet. Repeat with the
sensor cable for the Reference panel.
On the back of the Test panel, choose a solar cell as close to the center as
possible. Clean the surface of the cell with rubbing alcohol or non-residue
cleaner. Clean the cell in the same reference position on the Reference panel in
the same manner.
IMPORTANT: Before mounting, wash your hands and then clean the back of the
PV module or other device with ethyl alcohol.
Use Kapton tape for cable strain relief; a yellow label on the cable indicates
where the cable must be secured. If the temperature might exceed 70 °C,
Kapton tape is also required to better secure the sensor to the measurement
surface.
To ensure that the sensor disk and cable are adequately fastened to the measurement surface, use three strips of Kapton tape in two places each:
For strain relief, place the first strip of tape across the cable just below the
yellow heat shrink and rub the tape surface to remove bubbles.
Place the other strips of tape on the ends of the first strip of tape and rub the
tape surface to remove bubbles. These strips of tape should be perpendicular
to the first strip of tape—forming an “H”. They hold the first strip of tape down
against the weight of the cable.
To secure the sensor to the module surface, remove the paper from the bottom
of the disk and adhere the disk to the center of the module most center cell.
Place a strip of tape across the sensor head, perpendicular to the cable and rub
the tape surface to remove bubbles. Rub as close as possible to the sensor’s
disk. Do not go over the sensor molding with the tape; only put tape over the
metal disk portion of the sensor.
Test Panel
Modbus RTU
12 Vdc Battery (Optional)
Item List
Ships With
CR-PVS1 x 1
UV resistant cable ties x 2
Kapton tape x 1
110PV-L15-PT surface mount thermistor x 2
Flathead screwdriver x 1
Grommet x 4
Screw x 4
USB 2.0 Cable Type A Male to Micro B Male
CR300 Calibration Documentation
Quick Deploy Guide
Labels for Reference and Test Modules
USB flash drive with Device Configuration Utility software (DevConfig)
Other required items
Rubbing alcohol or non-residue cleaner
16–32 Vdc power supply
Input 16–32 Vdc
USB- User-Interface Connection
(Device Configuration Utility Software)
NOTE: Wiring and Modbus Configuration
tables are found on the back of this document
CR-PVS1
e.
3.6
3.7
3.8
Place the two other strips of tape on the ends of the sensor disk, perpendicular
to the first piece of tape and parallel to the cable then rub the tape surface into
the module surface.
Tighten the cable ties securing the sensor wires to the solar panel frame.
Wire the Test and Reference panels and sensors to the CR-PVS1 terminals
shown in the wiring tables in Section 4.tion Wire Color
Supply an input voltage of 16-32 Vdc through the CHG + and –
terminals. If backup power is needed, connect a 12 V battery to the Bat + and
– terminals.
Note: Cover the panels while wiring to reduce the voltage on the lead wires. Do not allow
the wires to touch each other.
4 Wiring Tables
d.
Panel Connections
Panel
REF
TEST
Wire
Function
CR-PVS1 Terminal
RED
+
REF Panel +
BLACK
–
REF Panel –
RED
+
Test Panel +
BLACK
–
Test Panel –
e.
110PV Temperature Sensor Connections
Panel
REF
TEST
5
Wire
Function
CR-PVS1 Terminal
BLACK
Power
REF Panel Temperature VX1
RED
Signal
REF Panel Temperature SE1
VIOLET
Ground
REF Panel Temperature G
CLEAR
Shield
REF Panel Temperature G
BLACK
Power
Test Panel Temperature VX2
RED
Signal
Test Panel Temperature SE2
VIOLET
Ground
Test Panel Temperature G
CLEAR
Shield
Test Panel Temperature G
In the Device Type panel, select CR300 Series. Follow the steps shown in the right panel
of the window to connect.
Set Time
In the Logger Control tab, select Local Standard Time. Click Set Clock.
Local Standard Time
5.2
a.
b.
c.
Set Location and Solar Panel Coefficients
In the Data Monitor tab, select the Public table from the list on the left.
Double-click on the value in the UTC_Offset_UserEntered field. Enter the
correct Coordinated Universal Time (UTC) offset value for the location and press
Enter.
Double-click on the value in the Latitude_UserEntered field. Enter the
latitude for your location and press Enter. Do the same for the longitude in
6 Offset Correction
A difference in power output of the two modules under identical conditions, including
cleanliness, weather, and position of the sun is expected. This difference is called the “offset” and can significantly vary between solar modules, even of the same model and batch.
The “offset” should be determined at the beginning of the soiling measurement campaign
and should be updated periodically.
The procedure below causes the program to automatically determine the offset, and then
implements a correction factor into the measurement sequence to remove any effects that
may be caused by the offset.
NOTE: The procedure is only followed to remove the “offset” when both modules are clean. It is
not used as an indicator of when the reference module only is cleaned.
NOTE: The offset correction procedure is normally initiated in the morning, immediately after
both modules are cleaned. In this case, the offset will be updated at midnight if the minimum
number of good data points is met. If the offset correction is applied in the afternoon, then the
offset will be updated at the end of the following day assuming the minimum number of data
points has been met.
1.
2.
This table shows the default Modbus serial
settings for the CR-PVS1. Any device connected
to the the CR-PVS1 must have the same
configuration for successful communication.
Device Configuration Utility (DevConfig)
To complete the following steps, connect to the CR-PVS1 using Device Configuration Utility
(DevConfig). A copy of DevConfig is provided on the USB flash drive included with the CRPVS1. DevConfig is also available as a free download from Campbell Scientific.
www.campbellsci.com/devconfig
5.1
Longitude_UserEntered.
Double-click on the value in the AlphaTest_UserEntered field. Enter the
correct value and press Enter. Do the same for the AlphaRef_UserEntered,
IscTeststc_UserEntered, and IscRefstc_UserEntered values.
Double-click on the value in the HrSolNoonOffset_UserEntered field. Enter
the correct value and press Enter. Do the same for GeffThreshold_UserEntered.
Definitions:
UTC_Offset_UserEntered: User-entered UTC offset of site location, hours
Latitude_UserEntered: User-entered latitude of site location
Longitude_UserEntered: User-entered longitude of site location
AlphaTest_UserEntered: Published panel short circuit current (Isc) temperature coeffecient of the test panel (if published in units of %/deg_C then
enter published value/100)
AlphaRef_UserEntered: Published panel short circuit current (Isc) temperature coeffecient of the reference panel (if published in units of %/deg_C
then enter published value/100)
IscTeststc_UserEntered: Published panel short circuit current (Isc) of the test
panel at STC
IscRefstc_UserEntered: Published panel short circuit current (Isc) of the
reference panel at STC
HrSolNoonOffset_UserEntered: User-entered field that defines that
number of hours before and after solar noon to include measurements
for calculating soiling index.
GeffThreshold_UserEntered: User-entered field that defines that minimum
effective irradiance value for calculating soiling index.
5.3
View Data
Live data is shown in the Public table. To verify that the system is working as
expected, review the Raw_Measurement_Data and the Modbus_Register_Map values.
5.4
Modbus Configuration
ComPort
Com RS-232
Baud Rate
19200, 8-bit
Parity
Even
Address
11
Data
32-bit Float
Data Format
CDAB
The soiling loss index based on short circuit current only and effective irradiance (including temperature correction) will show the previous day’s average
soiling loss index assuming the minimum number of stable data points are
recorded. If zero stable data are recorded for the day, the SLI will show NAN.
If the minimum number of stable data points are recorded, the soiling loss
indices will update at midnight.
Double-click on the value in the Update_Offset field. Enter –1 and press
Enter.
Results will be available when the minimum number of data points has been
met for calculating a good offset value. This is typically at midnight if the offset
was initiated in the morning or midnight of the following day if the offset was
initiated in the afternoon.
Inital Value
Entered Value
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