The EOL Zenith data logger collects data in compliance with IEC61400-12 for high-quality wind and solar resource assessment when maximum performance, reliability, and ease of use is a must. It is the perfect combination of data logger technology coupled with cutting-edge remote data collection and management software.

The EOL Zenith is designed for optimal performance in any climate – from the bitter colds of northern Norway to the desert heat of Egypt. Read our related case studies (Case Study 7 or Case Study 2). 

This exceptionally versatile performance is thanks to the carefully designed electronics, robust and reliable components, and low power consumption of the data logger – a feature that remains unique to the EOL Zenith and of crucial importance when operating in remote areas. Specific design features include:

  • 1Hz sampling rate (complying with IEC61400-12)
  • Advanced sensor error diagnosis
  • Live real-time data (bi-directional communication)
  • GPS time stamp and synchronization
  • Automatic file download
  • Multiple data delivery and forward options
  • 10 min. averaging interval (user selectable)
  • Data encryption and 2 level password protection
  • No interface cards required
  • No programming required
  • SCADA/Modbus capability (option)
  • Ultrasonic capability (option)
  • Met mast management tool (EOL Manager) that helps keep track of all your sites

The EOL Zenith data logger offers a wide range of possibilities and is the core component in wind resource measure­ment campaigns. By default, the data logger comes equipped with GSM/GPRS communication capabilities. Due to its very low energy consumption, a 10W solar panel is sufficient for standard operation (dependent upon hours of sunlight, latitude, etc.)

Do you want to be completely up to date on all your wind measurement campaigns 24/7?

With EOL Zenith data logger, you can do just that. All it takes is an internet connection and you have complete control over all your sites – the EOL Manager even helps keep track of them all from just a single dashboard!

To learn more, download our quick user guide. Have questions about the EOL Zenith’s capabilities, pricing, and availability? Click here to contact us with your questions. 

Anemometers: 10 anemometers (synchr. generator, push-pull, reed contact or hall effect)
Wind vanes: 2 + 5 analog (potentiometer) and 2 digital
Analog: 13 inputs (Temp., hum., pressure, radiation, up flow wind etc…)
SCADA/Modbus capability: Option (compatible with Enercon, Suzlon, Vestas, GE, Gamesa, Acciona)
Data delivery: Multiple options incl. automatic data forwarding
Satellite communication: Option
Live real-time data: Yes pr. default
Integration time: 1 second (according to IEC 61400-12)
Recording interval: 10 minutes (default) user selectable
Time accuracy and syncronization: GPS precision, always sync.
Recorded values / channel: 10 minutes: average, standard dev. (config), min (config), max (config)
Turbulence and gusts: TI 30 sec. (ane channels 1 and 2), St. dev. 10 min., max and min gust
Geographical coordinates: Records the site coordinates according to the GPS
Speed resolution: 16 bits (< 0.01 m/s)
Gust Precision: 0.05 m/s
Standard deviation precision: 0.01
Wind vane Resolution: 8 bits (1.4º)
Analog Resolution: 12 bit (1.22 mV)
Voltage: 5-30 V DC Reverse polarity protection. Solar power supply available.
Modem power: User configurable and smart management by logger
Memory card: SD/MMC 1GB
Storage period: >5 years
Digital outputs: 3 outputs
Warranty: 2 years against manufacturing defects and material flaws
Standard: IEC 61400.12.1
Download options: Telemetry, MMC reading
Data encryption: All data is encrypted and password protected (configurable)
Output file format: *.txt, MS-Excel and configurable data columns
Raw data, decoded data and download report
Digital signature: By GPS. For data modification prevention
Communication system: CSD, SMS, Internet (GPRS), CDMA, Satellite and RS232 cable.
Connection register: Remote connections + keyboard access with date and time of the event
Antennas: GSM & GPS
Terminals: Removeable Plugs
MODEM: GSM/GPRS/GPS quad band internal modem
Screen: LCD w/ 64x128 resolution
Keyboard: 6 buttons keyboard
Communication slots: 2 serial ports
Memory slots: 2 memory slots
Sensor configuration: Telemetry, by inserting MMC memory into logger or by keyboard
Firmware configuration: OTA configuration and by MMC insertion
Display activity register: Every time a technician press a key and turns on the display, the event is registered and recorded in the MMC memory with time and date
What format should the SD memory have for it to work with the EOL Zenith?

If you are using the SD memory card that was supplied together with the data logger, the SD card is already formatted.

In case you want to re-format a SD card please follow these steps:

1.       Turn off the data logger

2.       Insert the SD card you want to format into the data logger

3.       Turn the data logger on

4.       Wait for at least 12 minutes

The SD card is now formatted correctly.

Can I use another SD memory card with the data logger?

Yes, you can use other SD memory cards (with a maximum capacity of 2GB). Please make sure that the SD card is correctly formatted before use.

Not all SD memory cards are the same. We strongly recommend using the SD memory card that was supplied together with the data logger since these SD memory cards are industrial grade cards.

How does the data management system work for the EOL Zenith?

Before you get started with EOL Manager and the EOL Zenith data logger read this.

The EOL Manager is used to prepare the configuration file for the EOL Zenith data logger. The .sit file (configuration file) is then uploaded to the data logger.

EOL Manager downloads the encrypted .log file from the data logger. The .log file contains all the RAW data (the pulses and Hz stored from all the sensors connected to the data logger)

EOL Manager then automatically converts the .log file into a .wnd file and .txt file using the active logger configuration file (also stored on your PC)

I need a SIM card that enables internet connection to my EOL Zenith data logger. Where can I get it?

Our engineers have come up with a solution for a single SIM card that offers Internet connection to your data loggers and works in almost all countries worldwide. A single SIM card that checks for all available local GPRS signals and automatically connects to the one with the best coverage.

Benefits with our new Global SIM card:

  • Internet connection to all your data loggers
  • Faster download times
  • One solution for all your sites
  • Get the most out of EOL Manager including automatic data transfers
  • No more talking to your local GSM provider
  • Cost effective and no monthly data plans 

Click here for more information on our “Global SIM Card”

Contact us on for more information and prices on this Global Internet SIM card.

What battery should I use for the data logger?

We recommend using a flotation (back-up) sealed lead-acid battery (12VDC). This kind of battery has no maintenance and can be transported in any orientation. If you are performing wind measurement and are using an internet / GSM connection to your data logger, we recommend using a 24Ah battery. This gives autonomy of approximately 1 month without the battery being recharged.

How do I make sure my solar panel is charging the battery correctly?

To test that the solar power supply system has been installed and performs properly you need a multimeter set to “Read Current” mode.

Step 1

To begin with you should check if the output from the solar panel is correct. You should do this on a sunny day (Please connect the multimeter as shown in drawing here below)

Step 2

Now check that the regulator is charging the battery. There are leds on the solar regulator helping you to indicate if the regulator is charging the battery. But to be sure you should check with the multimeter (see drawing here below)

In addition to dimensioning the solar power supply system correctly, it is important to orient the solar panels appropriately for maximum electricity production. See FAQ "How should I install the solar panel for charging the battery"

How should I connect the power supply to the EOL Zenith data logger?

Usually solar power systems for the EOL Zenith consist of a solar panel, a charge controller and a battery.


Always connect the battery terminals directly to the BAT + and – on the data logger. Do not connect the LOAD+ and LOAD- to the data logger. The reason we recommend this is to avoid the regulator to switch off its outputs when the battery drops below a certain cutoff limit for the regulator. Keep in mind that the data logger can work with 5V.

See figure 1.2A

The solar power supply system must be dimensioned depending on the location of the measurement site and the number of sensors connected to the data logger. 

An example: A met mast installation with the following sensors connected to the data logger equipped with a 20W solar panel and a 40Ah battery would give you approximately 45 days of complete autonomy (Location Germany).

  • 6 Anemometers
  • 2 Wind vanes
  • 1 Temperature & Humidity 
  • 1 Pressure sensor

How do I setup the EOL Zenith in the beginning?

We have created a "Quick User Guide" for new users. It is a quick way to get started and explains some of the general working of the data management system. Click here to download it.

Where is the data stored on the data logger?

The RAW data is stored on the SD card inserted in the data logger. All the RAW data is encrypted and can only be extracted using EOL Manager. You cannot use Windows Explorer to extract data from the SD memory card.

How to ground the data logger correctly.

To ground the EOL Zenith®, connect one end of the copper ground wire (usually yellow-green color) to the data logger GND terminal and the other end to an independent grounding spike.

If the enclosure is metallic you must also connect the enclosure to the ground wire, to do so, all metallic enclosures have a connection screw terminal with the ground symbol on it.

Click here to download our "how to ground" guide

How should I install the solar panel for charging the battery?

In addition to dimensioning the solar power supply system correctly, it is important to orientate the solar panels appropriately for maximizing the energy production during the season with less sun energy.

In general the solar panel should be facing GEOGRAPHICAL SOUTH in the Northern hemisphere and GEOGRAPHICAL NORTH in the Southern hemisphere. And as a rule of thumb the inclination of the solar panel should be the latitude of the site where you are installing the solar panel -10°.

E.g. For an installation in Germany, close to Frankfurt (with latitude 50° N) you should orientate the solar panel towards SOUTH and with an inclination of 40° with respect to horizontal.

For sites in the North (e.g. Scandinavia), or where there may be very little sunlight during certain periods of the year, an individual solar radiation calculation should be carried out. You can contact our technical support for help on this.

Tropical and Equatorial sites

In inter-tropical latitudes the sun can be located either North or South. In the equator, for example, the met mast structure shadow is projected to the South for 6 months and to the North for the other 6 months. This of course lowers the radiation on the solar panel and we therefore recommend installing two separate solar panels.

Installing two solar panels

If you are going to install two separate solar panels, we recommend the following configuration (see images below). Both panels are to be installed in booms parallels to the West-East Earth axis, with one solar panel pointed towards the North (and tilted approx. 10°) and the other one pointed towards the South (and tilted approx. 10°). The charging efficiency is increased by using independent solar chargers for each solar panel.


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