BF .... right you may regarding the ~13 hours at 14.2 volts. I thought I had recalled some T Series literature long ago that talked of 4 hours being the time for the high voltage period before it automatically dropped to the 13.6-13.8 volt range.
That still would be better to use for longer term drycamping stays with the brand of AGM batteries I've been using instead of - for the rare times we camp longer term - our 13.8 volt fixed voltage 7345 paralled with a Sears 10/2/50 or our 7345 supplimented with our idling V10's alternator.
Here's some info on the discontinued Parallax T series:
http://d163axztg8am2h.cloudfront.net/static/doc/26/77/f0e81d6f50d9a8f29fed7063ad4d.pdf
