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PC-based datalogger for renewable energy systems

PC-based datalogger for renewable energy systems

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By Nick Flaherty



The DS-108 has a +5V voltage output to power peripheral circuitry and has 8 digital voltage inputs, which allows the recording of binary inputs such as switches, doors open/closed and pump or motor status, a feature which is not generally available on similar loggers. The system is supplied with three temperature robees with an accuracy of ±0.5 ºC. 

The DS- 108 is powered from the PC USB port, so a separate power supply is not needed, and the digital inputs accepts +2V to +30Vdc as a logic 1, voltages below +2V are considered logic 0. The +5V output powers external signal conditioning circuits that are available separately as options. 

The datalogger sends all temperatures and digital input status infromation to the PC every second which is then automatically saved to disk every 10 seconds. The software displays and saves incoming data from the datalogger, and the user can choose to view a dashboard with alarm levels or a graph of the temperatures and status of digital inputs.

The system has been used to monitor a  renewable energy home heating system, correlating the temperature of the hot water storage tank, boiler, feed and return pipes with the heating demand, boiler activity and various valve positions (open/closed). Similarly it has been used for a battery charging system, recording the temperature of battery packs, charger and ambient temperature as well as the charge status (charging or not) with the current demand and whther the battery was delivering power or not.

For more information see www.electrocorder.com

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