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Soiling & Irradiance Measurement Kit

Small, light, low-power, and easy to install
Easily adapt to fixed-tilt or tracker installations
Single connection cable for digital option
No on-site calibration needed and no calibration data to manage – internally calibrated to W/m²

Make : Atonometrics

Model : Soiling & Irradiance Kit – Dual RC18 Reference Cells

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 Overview
Multipurpose dual RC18 PV reference cell kit – a simple and compact solution for measuring both soiling and irradiance.
Your on-site personnel manually wash the labeled “clean” cell on a regular schedule.
Use the clean cell for accurate irradiance measurement and compare the dirty cell to the clean one to calculate soiling ratio.

Advantages
Small, light, low-power, and easy to install
Easily adapt to fixed-tilt or tracker installations
Single connection cable for digital option
No on-site calibration needed and no calibration data to manage – internally calibrated to W/m²

Soiling Ratio Calculation
Program your data logger to ratio the daily average dirty cell irradiance to the clean one
Sample datalogger code available

 Reference Cells
Uses Atonometrics RC18 Series PV Reference Cells: crystalline silicon PV cells with internal precision shunt resistor and RTD, temperature correction, temperature output, and digital control
Digital (Modbus RS485) and analog (0-1.5 V, 0-10 V, 4-20 mA) output options
See RC18 datasheet and user manual

Cables
Included cable hub box allows powering and communicating using a single cable when using the Modbus RS485       option. For analog options, use two cables, one for each reference cell.
Various cable length options available

Mechanical
IP67-rated cast aluminum enclosures.
Aluminum mounting plate.

 

 

Main Data

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Irradiance measurement range

0 to 1500 W/m²

Irradiance resolution

0.1 W/m²

Soiling ratio measurement range

0.00 – 1.00

Soiling ratio precision

1%

Operating temperature

-35 to 80 °C

Input power

8-28 VDC (12-28 VDC for 0-10V analog output)

PV cell

Crystalline Si, 20 mm x 20 mm

PV cell windows

Low-iron solar glass

Calibration data

Internally calibrated; no calibration data to manage

Setup

Optional configuration kit allows PC-based setup

Digital

:-

Communication protocol

Modbus over RS485, user-settable Modbus addresses

Baud rate

Up to 57.6k

Analog

:-

Analog output options

0-1.5V, 0-10V, or 4-20mA

Analog output signals (each cell)

Choose 2: Irradiance, Cell temperature, Short-Circuit Current

Current consumption

0-1.5V or 0-10V mode: both cells together, typ. 16-30 mA
4-20mA mode, both cells together: 30-110 mA

Output impedance

0-1.5V or 0-10V mode: 2 kohm

Internal voltage drop

4-20mA mode: Allow 3.5 V minimum

Enclosures

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Material

Powder-coated cast aluminum housing

Outdoor rating

IP67

Dimensions

Mounting plate: 7.00 in. x 8.50 in. / 177.8 mm x 215.9 mm

Weight

2.0 lb / 0.9 kg

Mounting

Mounting holes dia. 0.406 in. / 10.3 mm, see diagram

Cable

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Type

Shielded, weather resistant, UV-rated, 24 awg / 0.2 mm²

Cable length options

4 m, 10 m, 25 m, 50 m, 100 m, custom

Connector

M12 circular connector, IP67

Pinout (each cell)

Power, Ground (3x), Analog 1 & 2, RS485 A & B, Shield

Single cable option

Included cable hub box for digital options, use a single cable for both cells

Measurement Specifications

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Response time

0.15 s

Electronics non-linearity

± 0.03% of range

Repeatability

± 0.02% of range

Temperature drift, -35 °C to 80 °C

± 0.4% at 1000 W/m²

Cell temperature measurement

± 1 °C

Irradiance calibration

± 1.2%, calibrated to NREL-traceable reference standard

Overall irradiance uncertainty

± 2.0% @ 1500 W/m², ± 2.9% @ 100 W/m²

Stability

0.5% / year

Standards

IEC 61724-1 Class A, IEC 60904-2, IEC 60904-3, IEC 60904-10