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Established technology in a new outfit
The GSM-batcorder is based on the succesfull batcorder 3.1 and includes all the features of the wind turbine extensions control module. Thus it includes SMS messaging as well as microphone testing. You'll get an established and well proven technology in a new design. In addition it features an USB connection that allows dat access while the batcorder is not in scanning mode. Connect the GSM-batcorder with a computer and download data automatically or remotely.
Automatic data backup and remote access
Utilizing an USB connector the GSM-batcorder can be connected to any computer. We have established a simple script-based backup system running on a Raspberry Pi. This automatically backups newly recorded bat sounds on an external memory connected to the Raspberry Pi using rsync. Practically that is a USB memory stick with capacities of 128 GB or more. If the Raspberry is connected to the internet a status message is sent daily as well informing about successful backup and the backup available space.
For remote access the Raspberry Pi must be connected to the internet (fixed IP at the router) and the turbine internet router needs to forward a port to the Raspberry for SSH. That has to be established by the turbine owner. If setup correctly you can connect via SFTP and download recordings to your office.
Bat surveys at lofty height
Wind energy plays a crucial role in sustainable energy generation. In perspective to planning the deployment location the conflict of wind energy and bat mortality has to be considered. In Germany a standardized monitoring concept was worked on at universities Hannover and Erlangen-Nuernberg. In this study up to 90 batcorders were installed in wind turbine nacelles (alltogether 13000 nights of sampling).
Supplied with the extension comes a special plastic disc in which the microphone is embedded in (boundary microphone). This disc was specifically developed for the batcorder. Its properties are as far as possible identical to the disc used in the above mentioned project. Thus, data collected with the batcorder extension can be compared to the project data if the batcorder uses the same settings. The disc is inserted directly into the gondola through a drill hole with a diameter of 10cm.