Instrumentation#
Solar tracker with instruments.#
Global horizontal irradiance (GHI)#
The Global horizontal irradiance is measured using an unshaded pyranometer, mounted horizontally on a Kipp & Zonen SOLYS2 tracker.
Start date |
Instrument |
Serial Number |
Sensitivity (μV/W/m2) |
Calibration date |
|---|---|---|---|---|
Kipp & Zonen CM11 |
840487 |
4.98 |
01-03-1984 |
|
Kipp & Zonen CM11 |
840487 |
5.065 |
13-05-2015 |
|
21-06-2018 |
Kipp & Zonen CMP11 |
128767 |
8.14 |
21-06-2018 |
22-02-2021 |
Kipp & Zonen CMP11 |
128767 |
8.02 |
08-02-2021 |
The GHI sensor was moved onto the tracker on 2017-09-06. A ventilator was mounted on the GHI sensor on March 7th, 2024. Pyranometer 128767 was also calibrated in November 2012 (sensitivity: 7.95).
Diffuse horizontal irradiance (DHI)#
The Diffuse horizontal irradiance is measured using a pyranometer shaded by a shadow ball, mounted horizontally on a Kipp & Zonen SOLYS2 tracker.
Start date |
Instrument |
Serial Number |
Sensitivity (μV/W/m2) |
Calibration date |
|---|---|---|---|---|
Primo 2014 |
Kipp & Zonen CMP11 |
128764 |
8.34 |
06-11-2012 |
June 2018 |
Kipp & Zonen CMP11 |
128762 |
8.76 |
21-06-2018 |
04-01-2021 |
Kipp & Zonen CMP11 |
128766 |
8.27 |
11-05-2020 |
28-01-2021 |
Kipp & Zonen CMP11 |
128762 |
8.58 |
15-01-2021 |
A ventilator was mounted on the DHI sensor on March 7th, 2024. Pyranometer 128762 was also calibrated on November 2012 (sensitivity: 8.59).
Direct normal irradiance (DNI)#
The Direct normal irradiance is measured using a pyrheliometer, mounted on a Kipp & Zonen SOLYS2 tracker.
Start date |
Instrument |
Serial Number |
Sensitivity (μV/W/m2) |
Calibration date |
|---|---|---|---|---|
2014 |
Kipp & Zonen CHP1 |
140049 |
7.85 |
28-02-2014 |
2018 |
Kipp & Zonen CHP1 |
140049 |
7.88 |
23-04-2018 |
2021 |
Kipp & Zonen CHP1 |
140049 |
7.87 |
18-01-2021 |
Not used |
Kipp & Zonen CHP1 |
140049 |
7.9057 |
XX-10-2021 (IPC) |
All calibrations were performed by the manufacturer Kipp & Zonen in Delft, the Netherlands, with the exception of the IPC value.
Longwave downward irradiance (LWD)#
The Longwave downward irradiance is measured using a pyrgeometer shaded by a shadow ball, mounted horizontally on a Kipp & Zonen SOLYS2 tracker.
Start date |
Instrument |
Serial Number |
Sensitivity (μV/W/m2) |
Calibration date |
|---|---|---|---|---|
2018 |
Kipp & Zonen CGR4 |
170223 |
10.05 |
17-07-2017 |
Kipp & Zonen CGR4 |
170223 |
8.95 |
02-02-2021 |
Weather station#
The current weather station is a Lufft WS601-UMB Smart Weather Sensor, which started operation on 2025-04-01. The weather station was initially placed on the railing of the solar irradiance measurement platform. On 2025-05-09, the weather station was installed on a 6 m mast to the north of the platform on the roof of DTU Building 119. The weather parameters therefore, do not follow the standard meteorological measurement practices (e.g., wind should be measured 10 m above ground level). The station is placed 53 m AMSL.
Lufft WS601-UMB Smart Weather Sensor.#
From 2015 until the end of March 2025, the following meteorological parameters were measured by a weather transmitter, type WXT520, from the Finnish company Vaisala Oyj:
Air temperature
Relative humidity
Air pressure
Wind speed
Wind direction
Rain intensity
Rain duration
Vaisala WTX520 weather station.#