Anton, I may have mistakenly assumed that you were looking to build the whole thing from scratch.
If that's not the case, you may want to look at this:
PakTrakr Multi Battery Monitor Battery Pack Monitor
Can be configured to monitor up to 40 batts.
Quote:
Q: Is there a serial interface for logging data to a PC?
A: Yes, the PakTrakr sends out a CSV data stream every second,
containing all the battery data. By attaching a PC to the PakTrakr
via the optional serial interface, the data may be easily read into a
spreadsheet for analysis.
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