I have a device that's being battery powered and I would like to measure the power consumption over a longer period of time (~24Hours). I want to read both the voltage of my battery and the current being drawn by my device. I would need something battery powered that could log the data into a raw .csv like format so I can later run analytics on it.
I know this should be really simple but I'm not exactly sure what to Google to find what I need for this application.
Edit: Hoping not more than ~$500. Looking at 12V-48VDC and current <10A. However I would like fairly high accuracy because my application is very sensitive to power consumption. Rate could be on the order of seconds...maybe even minutes but doesn't need to be miliseconds.