Great batteries for agm. Taking them below 50% won't damage them - UNLESS you exceed what is considered fully discharged - typically at 10.7v. Going beyond 50% dod often, merely results in less cycle life, but sometimes it happens, so not a big deal if you planned your power budget properly.
I see they rate them at near 2K cycles at 50% DOD. Of course that is in lab-perfect recharge cycling conditions. Real world may be less. Even less if you regularly exceed 50%, but that does not mean damage unless you take them to the beyond. Ie, if you relied solely upon an inverter's "dead man backstop" of 10.7 / 11.7v as your normal LVD low-voltage disconnect, you will get far less cycles.
Those batts happen to also be PSOC capable (which means *resistant*, but not impervious - to sulfation from lack of a full charge). So you need to reach full charge (get that last 1% in) on a regular basis, but perhaps not every day in a daily cyclic application. This is better than your standard agm.
Typically lower internal resistance is great too, but perhaps not as good as a pure-lead agm - but we're nitpicking and bench-racing specs at this point.
Long answer - those are VERY NICE agm's. But being PSOC doesn't relieve one from reaching a TRUE full charge every once in awhile. Make sure your solar system is actually capable of doing that.
