I got the battery specs from Trevor. The batteries are pretty tough and accept a wide range of voltage inputs. Other than shore power float being a tiny bit low, everything is within spec. Also, since the solar panel float voltage is at the high end of the range, the two together should balance out.

Max Bulk Charge RateAbsorbFloatNotes
Battery Mfg. Recommended40-50% “higher possible”14.25 – 14.613.6 – 13.8
Magnum Shore Power Charger “AGM”132 (observed)14.513.5Float is a tiny bit low.
Solar MTTP “Sealed”??? Nothing observed14.413.8

Note that temperature has a big effect on these ranges as well.