WS50PV: All-in-One Weather Sensor (North America only)

The WS50PV is an inexpensive, small-sized, multipurpose weather sensor with the potential to quantify the most crucial parameters for industrial and commercial PV monitoring.

The WS50PV sensor has been fitted with a suite of professional measuring sensors and thus has the ability to handle air temperature, barometric pressure, wind direction, relative humidity and wind speed in a single effective housing to streamline mounting.

Users can add an external rain or temperature sensor to the single-wire digital Modbus interface for simple and quick integration. The WS50PV is the ideal tool that users would require for unleashing the performance of solar energy.


  • Building automation
  • Industrial PV monitoring
  • Commercial PV monitoring


Added Confidence for Energy Production

PV site performance analysis is reinforced by associating wind speed and air temperature with PV panel temperature data. The greater context of power production data ensures that the solar system fulfills expectations as well as allows more precise alarms to be set up for the detection of system failures.

Reliable Accuracy

Data users can rely on — ISO/IEC compliant with a life expectancy greater than a decade.

Hassle-Free Data

Users can concentrate on power generation, rather than sensor installation and maintenance. Five parameters are integrated into one housing, mount and cable with a single digital output to any Modbus RTU-ready data acquisition system.


Users can easily add a precipitation or back of module temperature sensor to the same Modbus ID.


Technical Attributes. Source: Kipp & Zonen

. .
*Parameters Measured Air Temperature
Air Pressure
Relative Humidity
Wind Direction
Wind Speed
Air Pressure Accuracy: ±0.5 hPa
Measuring range: 500 - 1100 hPa
Resolution: 0.1 hPa
Air Temperature Accuracy: ±0.5 °C
Measuring range: -40 - +60 °C
Resolution: 0.1°C (-20 °C - +50 °C), otherwise 0.2 °C
Units: °C, °F
Analog Inputs 1
Cable Connection Open Wires
Cable Length 33 ft (10 m)
Communication Modbus®
Dimensions Ø150 x 287 mm
Fastening Ø 60 - 76 mm
Interface RS485 2 wire
Baud rate: 1200 - 38400 bit/s (Standard: 19200)
IP Rating IP66
Material Enclosures Plastics (PC)
Operating Humidity 0 - 100% RH
Operating Temperature Range -40 - +60 °C
Output Rate 1 min
Power Supply Current consumption: 12 VDC, 85 mA; 24 VDC, 140 mA
Maximum consumption with heater on to support full ambient temperature range: 24 VDC ± 10%, 20 VA
Relative Humidity Accuracy: ±3% RH
Measuring range: 0 - 100% RH
Resolution: 0.1%
RS485 2-wire, half-dublex
Weight ˂1.2 kg
Wind Direction Accuracy: <5° RMSE (wind > 1.0 m/s)
Measuring range: 0 - 359°
Resolution: 1°
Wind Speed Accuracy (0 - 35 m/s): ± 0.3 m/s or ± 3%
Accuracy (>35 m/s): ± 5 % of RMS
Measuring range: 0 - 50 m/s
Resolution: 0.1 m/s


The potential of the solar energy market has been growing consistently. In the new episode of OTT CAST, the company considers the quickly growing Commercial and Industrial (C&I) segment. The C&I scale plants integrate the benefits of smaller and bigger installations.

As C&I installations are flexible in size and power output and are fitted with storage capacities, they can ensure the stability of the grid while providing advantages of distributed generation. Users should not miss the chance if they are interested in the topics listed below:

  • The effect of atmospheric conditions on plant performance
  • C&I Solar is expected to grow at 11% CAGR from 2021 to 2025 and will play a pivotal role shortly
  • Suitable environmental monitoring for C&I scale PV installations

Regarding the quickly growing C&I segment in North America, OTT HydroMet has introduced the latest WS50PV in that region, a compact multipurpose weather sensor to quantify the most crucial parameters for C&I PV monitoring.

By using the WS50PV, C&I plant operators in North America dependably capture wind direction, air temperature, relative humidity, wind speed and barometric pressure with a small and economical solution.

A PV plant’s performance can differ considerably based on various influences. An assertive decision of whether a power loss is due to technical issues or bad weather requires reliable monitoring.

With an expanding industry of commercial and industrial scale (C&I) PV installations in North America in mind, OTT HydroMet has introduced the new WS50PV, a reliable economical, user-friendly and compact all-in-one weather sensor.

For several decades, utility-scale PV plant operators have been monitoring various meteorological parameters using sensors from OTT HydroMet brands Kipp & Zonen and Lufft. Their reliable, easy-to-use and hassle-free solutions can now be advantageous to smaller installations on C&I scale.

The New WS50PV Unlocks the Full Potential of Users’ Operations

The latest ISO- and IEC-compliant WS50PV is the only compact all-in-one weather sensor for C&I application that incorporates integrated heating and active ventilation. It has been engineered to quantify the most critical parameters.

The correlation of meteorological parameters with power output and panel temperature improves performance analysis, which enables users to identify whether output variances are caused by changing weather conditions or a developing system fault.

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