Campbell DustVue Manual de usuario

Revision: 08/2023

Campbell Scientific, Inc.

DustVue

In-Field Soiling Measurement for

Operational and Site Assessment

(IEC 61724-1 Compliant)

PRODUCT MANUAL

Table of contents

1. Introduction 1

2. Precautions 1

3. Initial inspection 2

4. QuickStart 2

4.1 Configuration 2

4.2 User entered values 4

4.2.1 Definitions of UserEntered and solar panel 5

4.3 View data 6

4.4 Modbus settings and data 7

5. Overview 8

6. Specifications 9

6.1 Back-of-module temperature measurements 9

6.2 Modbus TCP communications 10

6.3 System 10

6.4 Power requirements 10

6.5 Compliance 10

6.6 Maintenance button 11

7. Installation 11

7.1 Connector panel 11

8. Operation 12

8.1 Measurement 12

8.2 Soiling loss index details 12

8.3 Offset correction 13

9. Maintenance 14

Appendix A. Variable description 15

Appendix B. Modbus register map 17

Table of Contents - i

1. Introduction

The DustVue Soiling Loss Sensor provides solar energy professionals with information needed to

evaluate and manage the impact of soiling on power production at the site. Plant operators can

use this information to determine when to clean the array, which saves the cost of unnecessary

cleanings and also helps to minimize damage caused by frequent cleanings.

The DustVue is designed to be the principle component of an independent soiling measurement

station, or as an add-on peripheral to any new or existing meteorological station. The DustVue is

delivered field ready and requires no programming. The DustVue will work with any photovoltaic

(PV) panel up to 700 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

temperature sensors are included.

2. Precautions

READ AND UNDERSTAND the Safety section at the back 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 DustVue every three years.

DustVue 1

3. Initial inspection

The DustVue ships with the following:

lDustVue enclosure

l2 back-of-panel temperature sensors: CS241-17-PT Surface-Mount Temperature Sensors

lUV-resistant 8 in. cable ties used to secure the temperature sensor cables

lFlat-bladed screwdriver for connecting wires to terminals

lUSB 2.0 Cable Type A Male to Micro B Male for computer communications

lCR310 Certificate of Calibration

l8 GB USB flash drive with Device Configuration Utility software

Upon receipt of the DustVue, 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

components 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. QuickStart

4.1 Configuration

Device Configuration Utility software is required to set time, set/view IP addresses, change

Ethernet settings, and view data. This software can be installed from the USB drive sent with the

DustVue. It is also available as a free download at www.campbellsci.com/devconfig.

1. Open the Device Configuration Utility

2. In the Device Type panel, select CR300 Series.

3. Follow the steps shown in the right panel of the window to connect.

DustVue 2

4. Set the Ethernet settings

a. Select the Deployment tab.

b. Fill in the Ethernet information appropriate for your network.

c. Press Apply on the bottom left of the screen to save the Ethernet network settings.

5. Set time. Although set at the factory, confirm time settings are correct and if necessary,

reset the clock at the time of deployment.

a. In the Logger Control tab use the drop down next to Reference Clock Setting and

select UTC (Greenwich Mean Time). Click Set Clock to apply the setting.

DustVue 3

4.2 User entered values

UserEntered values will be applied at the factory prior to shipping if they are provided to

Campbell Scientific when the DustVue is ordered.

Confirm all UserEntered values are entered correctly at the time of deployment.

CAUTION:

Be sure to check the Longitude_UserEntered,TempCoefflscTest_UserEntered,TempCoefflscRef_

UserEntered,IscTeststc_UserEntered, and IscRefstc_UserEntered values.

If any UserEntered values need to be changed, do the following the steps:

1. Select the Data Monitor tab.

2. Select the AllUserInputs table.

3. For each value that needs to be changed, do the following.

DustVue 4

a. Double click on the value in the field that needs to be changed:

b. Enter the correct value:

c. Press Enter to set the correct value.

4. When all values are corrected, set the ApplyandRestart variable to 1 and press Enter to reset

the system and apply all the values.

4.2.1 Definitions of UserEntered and solar panel

Table 4-1: User entered values and descriptions

Variable name Description

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

TempCoefflscTest_UserEntered

User entered temperature coefficient of Isc of the test panel.

Default = 0.105%/°C. Configured at the factory if value is

provided

TempCoefflscRef_UserEntered

User entered temperature coefficient of Isc of the reference

panel. Default = 0.105%/°C. Configured at the factory if value

is provided

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 editable field that defines the number of hours before

and after solar noon that will include measurements for

calculating soiling index. Default = 2 hours

GeffThreshold_UserEntered User editable field that defines the minimum effective

irradiance for calculating soiling index. Default = 500 W/m2

Stable_Data_Count_UserEntered

User editable field that defines the minimum number of

stable data counts for (re)calculating soiling index. Also the

minimum number of stable data counts for performing an

offset correction. Default = 20

DustVue 5

Table 4-1: User entered values and descriptions

Variable name Description

ModBus_ID

User editable field defining the Modbus address. Default = 11

(should not require modification for Modbus TCP

Communication)

ApplyAndRestart Enter a value of 1 to save user entered/edited values and

restart the DustVue

4.3 View data

The DustVue outputs data over Modbus TCP (see Modbus register map (p. 17). Live data is shown

in the Public table. To verify the system is working as expected, review the Raw_Measurement_

Data and the Modbus_Register_Map values.

The soiling loss index, based only on short-circuit current and effective irradiance (including

temperature correction), will show the previous days soiling loss index, assuming the minimum

number of stable data points are recorded.

DustVue 6

NOTE:

Both panels will generally soil at the same rate. The soiling ratio is most important the day

after the reference panel is cleaned.

If zero stable data points are recorded during the previous day, the SLI will show NAN. If the

minimum number of stable data are recorded, the soiling loss indexes will update at midnight.

4.4 Modbus settings and data

The following table shows default Modbus settings for the DustVue. Any device querying

information from the DustVue must have the same settings in order to receive the information.

Table 4-2: Modbus configuration

Parameter Default setting

Comport Ethernet, port 502

Baud Rate Not applicable for Modbus TC/IP. Defined by connection speed.

Parity No parity

Modbus address 11

Data 32-bit, float

Data format CDAB

The Modbus data can be viewed in the Public table.

DustVue 7

5. Overview

The DustVue uses the comparison-of-short-circuit method for assessing solar module

performance and losses due to soiling. Numerous studies have compared the advantages and

disadvantages of the different methods used to calculate losses due to soiling. These studies

DustVue 8

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