Parallax series 7300 converter question

To add to the discussion---and then there is duration to consider,i.e. my solar charge controller charges, in the Winter, at a higher rate of bulk and float but is only charging during the day, of course. It is charging three small AGM batteries and also two GC2 6 V's. In the Winter, temp compensation and the set charging voltages will be pushing charge at 14.8 V and a float of 14 or so. To date, I don't NOTICE any bad effects to either bank. Since I have AGM's that the mfg suggests to charge at high rates and the 6 V's thrive at near 15 V, a single configuration of set points is working well. I should have tested the AGM's capacity before installation and during their use on an intermittent basis but the battery Gods deemed differently.

I first added water to the 6 V's a few weeks ago. That was over a year with the controller doing the brain work.