ACCURACY of wind speed measurements is a KEY FACTOR for wind energy projects!
The accuracy of the calculated Wind Energy production from wind data:

As the Power of a wind turbine is proportional to the cube of the wind speed (v³),
a small deviation in wind speed will highly affect the calculation of the energy production.
The relative deviation of the calculated energy production is equal to:
3*total system accuracy / average wind speed.

For example: when the yearly average wind speed is 6 m/s, measured with a
system accuracy of +/- 0.5 m/s, the error in the calculation of the annual
energy production is appr. +/- 25%.

CONCLUSION:
The accuracy should be in the range of 0.1- 0.2 m/s for good results of the prediction
or evaluation  of the energy production of a (planned) wind energy project!

First Class systems are available in any configuration with First Class anemometers and
calibration certificates, required if bank credits are used for financing wind energy projects:
- according to European MEASNET standard and according to IEC 61400-121-CD
- according to NIST standard for MAX40+ anemometer (low cost / high performance)
Expandable with meteo sensors and power transducers for power performance evaluation
Data processing software is available and data processing services are available
for eg: calculation wind energy production, determination of power curve of wind turbine etc.



See also:
 Know how wind measurements
 General description
 Most significant features
 Price list for tailor-made systems    

The ultra low power consumption of appr 100 uA makes it ideal for remote applications, running at safe
battery pack (no solar panel required, also not if the wireless GPRS option is installed!)

The WindOne records directly to a Secure Digital (SD™) card (128MB to 2GB)  to provide reliable data storage.
An inexpensive SD™ card will store years of data at 10 min intervals.

An optional wireless GPRS internet connection is possible: receive datafiles automatically at a  server!
With optional online graphs, see below.

Using the recorded data is simple. The SD™ card is inserted into a card reader attached to the USB port
on your computer and will then show up as a drive.
Microsoft Excel  or practically any spreadsheet program can be used to view, graph, and analyze your wind data.
We also supply ready to use wind utilities for calculations of eg Weibull parameters, Energy production,
Frequeny distribution etc.

Logs wind sensors, weather sensors, analog inputs, and system parameters

• Anemometers (average wind speed, max, min and standard deviation)
  • Pre-calibrated (1 to 8 pcs)  for anemometers from Maximum/ NRG and
    Davis Instruments 7911/6410 or First Class anemometers
    Optional MEASNET calibration certificate and 16 bits resolution
    for highest accuracy (0.1 m/s)
• Wind vane (wind direction, 1 to 6 pcs)
  • Works with wind vanes from EKOPOWER DIR21+, NRG 200P, and
    Davis Instruments. 7911/6410 or other types.
• Thermometer (temperature) and atmospheric pressure sensor
• Optional inputs, like (12 or 16 bits)  0-5 VDC or 0/4..20 mA, counters, status, etc
• Real time clock
• Many optional sensors available: voltage, current, temperature, relative humidity, rain fall, light intensity,
  kWh (energy) and others

Possibilities:

• Adjustable sampling/logging interval: The sample interval is minimal 1 sec, logging interval is adjustable
  from 1 to 10000 samples (average, maximum, minimum and standard deviation).
  For most applications, a10 min interval is ideal.
   
• Sensors and Mounting: Our anemometers and wind vanes mount directly to with an stainless steel M5 bolt
  to a vertical hole. The wind sensors can be located hundreds of meters away from the WindOne system.
  Optional mounting arms are available.
   
• Display: A laptop (with RS232 or USB interface) can function as super-display for reading current
  information and is used for configuring the data logger, using the supplied control software:
  A simple menu-driven interface makes setup easy.
   
• Optional Ultra low power Wireless GPRS connecton for receiving data
  at your server via internet and with optional online graphs
  
  The WindOne system is also available with Ethernet connection
  with built in webserver, using the iBOX datalogger module.
  Communication possible via ethernet and/or  internet.

• Power Source: The WindOne operates directly from any DC voltage source between 6 and 14 volts.
  Ultra low Power consumption: approximately 100 uA, which allows the WindOne to be powered from
  the wall, alkaline or lithium  batteries, or solar power systems, or AC adaptor
   
• Clock: An accurate real-time clock is used to time-stamp each measurement. The clock is battery backed
  and is accurate to within some seconds a month (or can be synchronised with server!).
   
• Installation: The WindOne  mounts directly to a pole or mast using special clamps.

Wind sensors:
See overview with possibilities: wind sensors or acoustic anemometer

Other sensors/transducers:
additional channels possible for eg solar radiation, power, status, 4..20 mA
and (AC and DC) power transducers for power performance evaluation.
See products for more available additional sensors and transducers

Sensor accessories:
To make the installation easier, accessories for mounting wind sensors are possible with:
- tripod
- universal sensor mounting arm (USMA) for mounting wind sensors,
  temperature/humidity sensors with shield WS21, solar sensor 6450 (with bracket 6673). 
  Available for small or big masts  (specify mast size at order)
- booms for masts.
- our partners supply masts up to 80-120 meter!