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

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Campbell Scientific CR-PVS1  PV Soiling Loss Index RTU Owner Manual
Product Manual
CR-PVS1
PV Soiling Loss Index RTU
Revision: 10/19
Copyright © 2017 – 2019
Campbell Scientific, Inc.
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General
• Prior to performing site or installation work, obtain required approvals and permits. Comply
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Elevated Work and Weather
• Exercise extreme caution when performing elevated work.
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Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. Introduction................................................................ 1
2. Precautions ................................................................ 1
3. Initial Inspection ........................................................ 1
4. Specifications ............................................................ 2
4.1
4.2
4.3
4.4
4.5
4.6
4.7
Back-of-Panel Temperature Measurements .........................................2
Short-Circuit Current Measurements ...................................................3
Communications ..................................................................................3
System ..................................................................................................3
Power Requirements ............................................................................3
Compliance ..........................................................................................3
Physical ................................................................................................4
5. Installation ................................................................. 4
6. Operation ................................................................... 5
6.1
6.2
Measurement ........................................................................................5
Soiling Loss Index Details ...................................................................5
7. Maintenance ............................................................... 6
7.1
Offset Correction ..................................................................................6
Appendices
A. Glossary of Variable Names ................................. A-1
B. Modbus Register Map ........................................... B-1
Tables
5-1.
5-2.
Solar Panel Wire Color, Function, and CR-PVS1 Connections ...........4
Sensor Wire Color, Function, and CR-PVS1 Connections ..................4
i
CR-PVS1 PV Soiling Loss Index RTU
1.
Introduction
The CR-PVS1 PV Soiling Loss Index RTU provides solar energy professionals
with the information needed to evaluate and manage the impact of soiling.
Plant operators can use this information to determine when to clean the array,
saving the cost of unnecessary cleanings as well as damage caused by frequent
cleanings.
The CR-PVS1 is designed to be at the heart of an independent soiling
measurement station or as an add-on peripheral to any new or existing
meteorological station. It is delivered field ready and requires no programming.
The CR-PVS1 will work with any photovoltaic (PV) panel up to 300 W.
Smaller wattage panels can be used. Consult Campbell Scientific before
purchasing if using a panel smaller than 20 W. Two highly accurate and rugged
back-of-panel sensors are included.
2.
Precautions
READ AND UNDERSTAND the Safety section at the front of this manual.
DANGER: Fire, explosion, and severe-burn hazard. Misuse or improper
installation of the internal lithium battery can cause severe injury. Do not
recharge, disassemble, heat above 100 °C (212 °F), solder directly to the cell,
incinerate, or expose contents to water. Dispose of spent lithium batteries
properly.
WARNING:
•
Protect from overvoltage.
•
Protect from water.
•
Protect from ESD (electrostatic discharge).
IMPORTANT: Maintain a level of calibration appropriate to the application.
Campbell Scientific recommends factory recalibration of the CR-PVS1 every
three years.
3.
Initial Inspection
The CR-PVS1 ships with the following:
•
2 back-of-panel temperature sensors: 110PV-L15-PT Surface-Mount
Thermistors
•
Heat-Resistant Kapton Tape with Silicone Adhesive, 5 yd, for
securing temperature sensors
•
UV-Resistant 8 in. Cable Ties used to secure the temperature sensor
cables
•
Flat-Bladed Screwdriver for connecting wires to terminals
•
4 grommets and 4 screws for mounting the CR-PVS1 to a Campbell
Scientific enclosure backplate
1
CR-PVS1 PV Soiling Loss Index RTU
•
USB 2.0 Cable Type A Male to Micro B Male for computer
communications
•
Din-Rail Connector
•
CR300 Certificate of Calibration
•
8 GB USB flash drive with Device Configuration Utility software
•
CR-PVS1 Quick Deploy Guide (also available at
www.campbellsci.com/cr-pvs1)
Upon receipt of the CR-PVS1, inspect the packaging and contents for damage.
File damage claims with the shipping company.
Immediately check package contents. Thoroughly check all packaging material
for product that may be concealed. Check model numbers, part numbers, and
product descriptions against the shipping documents. Model or part numbers
are found on each product. On cabled items, the number is often found at the
end of the cable that connects to the measurement device. The Campbell
Scientific number may differ from the part or model number printed on the
sensor by the sensor vendor. Ensure that you received the expected cable
lengths. Contact Campbell Scientific immediately about discrepancies.
4.
Specifications
All CR-PVS1 RTUs are tested and guaranteed to meet electrical specifications
in a standard –40 to 70 °C non-condensing environment. Factory recalibration
is recommended every three years.
4.1
Soiling Loss Index:
can detect ≈1%
PV Panels:
up to 300 W crystalline or thin-film
Maximum Voltage:
50 V
Maximum Current:
20 A
Measurement Accuracy:
≈2 µV
Back-of-Panel Temperature Measurements
Measurement Range:
–40 to 135 °C
Temperature Uncertainty:
Temperature
Tolerance
–40 to 70 °C
±0.2 °C
71 to 105 °C
±0.5 °C
106 to 135 °C
±1 °C
Steinhart-Hart Linearization
Equation Error:
0.0024 °C maximum (at –40 °C)
2
CR-PVS1 PV Soiling Loss Index RTU
4.2
Short-Circuit Current Measurements
Current Shunt
4.3
Maximum Operating
Temperature:
80 °C
Shunt Accuracy:
±0.25%
Communications
Modbus RTU
4.4
4.5
Format:
RS-232, 19200 bps, 8 data bits, even
parity, 1 stop bit
Supported Functions:
03
Modbus Address:
11
Data Type:
32-bit float, CDAB
USB:
USB micro-B device only, 2.0 full-speed
12 Mbps, for computer connection.
RS-232:
Female RS-232, 9-pin interface
Clock Accuracy:
±1 min per month
Clock Resolution:
1 ms
Program Execution Rate:
30 s
System
Power Requirements
Charger Input (CHG):
16 to 32 VDC, current limited at 0.9 A.
Power converter or solar panel input.
External Batteries (BAT):
12 VDC, lead-acid 7 Ah battery, typical
Internal Lithium Battery:
3 V coin cell CR2016 (Energizer) for
battery-backed clock. 6-year life with no
external power source.
Typical Power Requirements
Sleep:
1.5 mA
Active 1 Hz scan with
analog measurements:
5 mA
USB Power (USB):
4.6
For programming and limited functionality
Compliance
View the EU declaration of conformity at www.campbellsci.com/cr-pvs1.
Shock and Vibration:
ASTM D4169-09
Protection:
IP30
3
CR-PVS1 PV Soiling Loss Index RTU
4.7
5.
Physical
Width:
20.3 cm (8 in); 21.6 cm (8.5 in) with
mounts
Height:
6.3 cm (2.5 in)
Depth:
14 cm (5.5 in)
Installation
TABLE 5-1 provides solar panel wiring and TABLE 5-2 provides 110PV
back-of-panel-temperature sensor wiring. The Quick Deploy Guide also
includes the wiring and other installation and configuration information.
Device Configuration Utility software is required. This can be installed from
the USB sent with the CR-PVS1. It is also available for download at
www.campbellsci.com/devconfig.
NOTE
DANGER
Download the Quick Deploy Guide at www.campbellsci.com/cr-pvs1.
To prevent injury, completely cover the PV panels to limit output
and current and voltage during installation. Do not short PV panel
+ and – wires.
TABLE 5-1. Solar Panel Wire Color, Function, and CR-PVS1
Connections
Solar Panel
REF
TEST
Wire Color
Function
CR-PVS1 Terminal
Red
+
REF Panel +
Black
–
REF Panel –
Red
+
Test Panel +
Black
–
Test Panel –
TABLE 5-2. 110PV Wire Color, Function, and CR-PVS1 Connections
Sensor
REF
TEST
Wire Color
Function
CR-PVS1 Terminal
Black
Power
VX1
Red
Signal
SE1
Violet
Ground
G
Clear
Shield
G
Black
Power
VX2
Red
Signal
SE2
Violet
Ground
G
Clear
Shield
G
4
CR-PVS1 PV Soiling Loss Index RTU
The CR-PVS1 has a Modbus RTU output. For the complete Modbus Register
Map, see Appendix B, Modbus Register Map (p. B-1).
6.
Operation
6.1
Measurement
To estimate soiling loss index (SLI), the CR-PVS1 system compares the
outputs and temperatures of two identical PV panels mounted side by side: one
clean, and the other soiled naturally.
Current measurements and back-of-panel temperature measurements are made
every 30 seconds. To make the current measurements, both panels are shortcircuited for 5 seconds using a solid-state relay. Short-circuit current is
measured with a precision current-sensing shunt. To help minimize PV panel
degradation, the panel is maintained in an open-circuit hold state between
measurements.
From short-circuit current and back-of-panel temperature, the effective
irradiance of each panel is calculated in accordance with IEC 60904, and the
SLI is calculated according to equation 6-2.
A daily average SLI is calculated, available for SCADA (supervisory control
and data acquisition), and stored in onboard memory. For immediate feedback,
a real-time index and quality factor are available. Raw measured data are stored
and available for analysis or independent post-processing. Available values are
shown in Appendix A, Glossary of Variable Names (p. A-1).
In accordance with IEC 60904, the CR-PVS1 calculates the daily soiling loss
index during the hour before and the hour after solar noon and only includes
the values showing effective irradiance greater than 500 W/m2 to minimize the
effects from the zenith angle of the sun, PV panel current dependence on
irradiance level, and air mass density. The CR-PVS1 also filters out data that is
classified as unstable (IEC 60904), such as data during cloud cover. A variable,
Stable_Data_Count, increments when all criteria are met.
6.2
Soiling Loss Index Details
In terms of quantities that can be measured directly from a PV panel, soiling
loss index (SLI) is defined as the loss in the irradiance reaching the solar cells
of a PV panel. If all other factors are the same, this loss is primarily due to the
loss in transmission properties of the glass as a result of soiling.
The irradiance is calculated from short-circuit current as
𝐺𝐺𝑒𝑒𝑒𝑒𝑒𝑒 = 𝐼𝐼𝑆𝑆𝑆𝑆
[1 − 𝛼𝛼(𝑇𝑇 − 𝑇𝑇0 )]
𝐼𝐼𝑆𝑆𝑆𝑆,𝑆𝑆𝑆𝑆𝑆𝑆
6-1
Where Geff: effective irradiance reaching the solar cells
ISC: measured short-circuit current of the panel
ISC,STC: short-circuit current at standard test conditions (STC)
5
CR-PVS1 PV Soiling Loss Index RTU
T: back-of-panel temperature
T0: back-of-panel temperature at STC, typically 25 °C
α: temperature coefficient of short-circuit current
The SLI uses the effective irradiances of a clean reference panel and a dirty test
panel. It is defined as
𝑆𝑆𝑆𝑆𝑆𝑆 = �1 −
𝐺𝐺𝑒𝑒𝑒𝑒𝑒𝑒,𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇
� × 100%
𝐺𝐺𝑒𝑒𝑒𝑒𝑒𝑒,𝑅𝑅𝑅𝑅𝑅𝑅
6-2
Where Geff,Ref is the effective irradiance calculated from the clean reference
panel, and Geff,Test is the effective irradiance calculated from the test panel.
7.
Maintenance
For more accurate soiling-rate estimations, clean the reference (clean) panel as
often as the pyranometer, a minimum of once per week. Clean with distilled
water and a lint-free cloth.
7.1
Offset Correction
PV panels often differ in power output under identical conditions, even when
they are from the same batch of the same model. This offset in power output
can be determined upon installation and updated after each cleaning. The
procedure determines the offset, and then implements a correction factor into
the measurement sequence to remove any effects that may be caused by the
offset.
NOTE
Carefully clean both panels before initiating this process. Cleaning
should be completed before 11 a.m.
1.
Connect to the CR-PVS1 using Device Configuration Utility. In the
Device Type list, select CR300 Series. Follow the steps shown in the right
panel of the window.
2.
Once connected, select the Data Monitor tab. Click Public in the table
list.
6
CR-PVS1 PV Soiling Loss Index RTU
3.
Double-click on the value in the Update_Offset field. Enter 1 and press
Enter.
4.
Results will be available with the next measurements.
7
Appendix A. Glossary of Variable
Names
Variable Name
Description
RTU_Internal_Temp
Panel temperature of CR-PVS1, °C
RTU_Voltage
Battery voltage of CR-PVS1, VDC
Soiling_Loss_Index_Corrected
Soiling loss index with offset correction applied, %
Soiling_Loss_Index_Raw
Soiling loss index without offset correction applied, %
Live_Index_Corrected
Real-time index of reference to test panel with offset correction applied, %
Live_Index_Raw
Real-time index of reference to test panel without offset correction applied, %
Stable_Data_Check
Variable indicating if environmental conditions are stable, True (–1)/False (0)
Time_Status
Variable indicating if the time of day is appropriate for performing soiling
loss index calculations
Geff_Status
Variable indicating if the measured effective irradiance is appropriate for
performing soiling loss index calculations
Isc_Status
Variable indicating if the measured short-circuit current is appropriate for
performing soiling loss index calculations
Temp_Status
Variable indicating if the measured back-of-panel temperature is appropriate
for performing soiling loss index calculations
IscTest
Short-circuit current of test panel, Amps
IscRef
Short-circuit current of reference panel, Amps
TempTest
Back-of-panel temperature of test panel, °C
TempRef
Back-of-panel temperature of reference panel, °C
GeffTest
Effective irradiance of test panel, W/m2
GeffRef
Effective irradiance of reference panel, W/m2
Offset_Geff
Measured offset between reference and test panels, %
Stable_Data_Count
Incrementally counts when conditions are appropriate for performing soiling
loss index
Boolean variable that user triggers when the offset correction is to be
performed
Update_Offset
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 %/°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 %/°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
LocalSolarNoon
Solar noon of site location, as determined by user-entered site location data
A-1
Appendix B. Modbus Register Map
ModbusData(1)
ModbusData(2)
ModbusData(3)
ModbusData(4)
ModbusData(5)
ModbusData(6)
ModbusData(7)
ModbusData(8)
ModbusData(9)
Parameter
Minute
Soiling_Loss_Index_Isc
Soiling_Loss_Index_Geff
IscTest
IscRef
TempTest
TempRef
GeffTest
GeffRef
ModbusData(10)
Offset_Isc
ModbusData(11)
Offset_Geff
ModbusData(12)
ModbusData(13)
ModbusData(14)
ModbusData(15)
Update_Offset
UTC_Offset_UserEntered
Latitude_UserEntered
Longitude_UserEntered
ModbusData(16)
TempCoeffIscTest_UserEntered
ModbusData(17)
TempCoeffIscRef_UserEntered
ModbusData(18)
ModbusData(19)
ModbusData(20)
ModbusData(21)
ModbusData(22)
ModbusData(23)
ModbusData(24)
IscTeststc_UserEntered
IscRefstc_UserEntered
HrSolNoonOffset_UserEntered
GeffThreshold_UserEntered
RTU_Voltage
RTU_Internal_Temp
LocalSolarNoon
Description
HeartBeat
Soiling Loss Index Isc
Soiling Loss Index Geff
IscTest, Measured short circuit current from the dirty panel
IscRef, Measured short circuit current from the clean panel
TempTest
TempRef
GeffTest, Effective Irradiance received by the dirty panel
GeffRef, Effective Irradiance received by the clean panel
Offset in Isc between the clean and test panels, when both are
clean
Offset in Geff between the clean and test panels, when both
are clean
Update Offset
UTC Offset of the site, User Entered
Latitude of the site, User Entered
Longitude of the site User Entered
Temperature Coefficient of Isc for the Test panel, User
Entered
Temperature Coefficient of Isc for the clean panel, User
Entered
Short circuit current of test panel at STC, User Entered
Short circuit current of clean panel at STC, User Entered
Offset from solar noon for daily average
Threshold in effective irradiance User Entered
RTU Battery Voltage
RTU Internal Temp
Local Solar Noon
Register
Start
40001
40003
40005
40007
40009
40011
40013
40015
40017
Register
Stop
40002
40004
40006
40008
40010
40012
40014
40016
40018
Low
Range
0
–20
–20
–10
–10
–30
–30
0
0
High
Range
59
20
20
10
10
80
80
1200
1200
40019
40020
1
10
40021
40022
1
10
40023
40025
40027
40029
40024
40026
40028
40030
0
–12
1
12
40031
40032
0
40033
40034
0
40035
40037
40039
40041
40043
40045
40047
40036
40038
40040
40042
40044
40046
40048
0.5
0.5
0
100
9
-40
12:00
No
Max
No
Max
20
20
2
500
13
70
13:00
Units
Seconds
%
%
Amp
Amp
°C
°C
W/m^2
W/m^2
No
Units
hrs
degrees
degrees
Amp
Amp
Amp
Amp
hrs
W/m^2
Volts
°C
hrs
B-1
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11.3732.3399
vendas@campbellsci.com.br
www.campbellsci.com.br
Canada
Location:
Phone:
Email:
Website:
France
Barcelona, Spain
34.93.2323938
info@campbellsci.es
www.campbellsci.es
Location:
Phone:
Email:
Website:
Logan, UT USA
435.227.9120
info@campbellsci.com
www.campbellsci.com
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