OSSDAS stands for Open Source Solar Data Acquisition System.

 Early Version

 

Link: https://www.circuitsdiy.com/open-source-solar-data-acquisition-system-first-draft

Features:

  • Logs everything into attached SD card for data analysis in PC. A typical 1GB SD card can store years of data. Data is recorded in frequency of few seconds. Enough to plot a graph to analyze performance of short periods of ten minutes too.
  • Keep track of the solar panel voltage, battery voltage, charge current and other parameters
  • Keeps track of other data such as temperature, etc
  • Can work without the LCD and still record information to the SD card and vice versa.

 Version 1 beta:

Component layout of V1 beta

Link: https://www.circuitsdiy.com/ossdas-rev-beta

  • Current sense through even lower valued resistor and using op-amp to multiply the very low drop voltage. Symmetrical to a low side CSA.
  • Integrated charging control. Charging path from solar panel to battery goes through CSA, FUSE, DIODE, INDUCTOR, and a MOSFET. The MOSFET is driven by the micro controller.
  • Introduced one/two SMD components; capacitors and resistors.

Software/Firmware:  A derivative work from the Atmega32 Datalogger by C.C.Dharmani.

Status: Not put into production. Many changes are made which includes changing most passives to surface mount devices.

 Version 1:

Link:https://www.circuitsdiy.com/ossdas-v1
  • Most resistors and capacitors are replaced with 0603 SMD version.

Software/Firmware:  Work in progress. This will be also a derivative work from the Atmega32 Datalogger by C.C.Dharmani.

Status: Final development stage.

UPDATE#1’st Aug 2012:   Software done. Little bug in amperes reading, everything else goes fine. Hope to finish it soon after my exams.