AGM battery charge characteristics as a solar bank.

[viper]

I was poking around and found some really good info from some of you guys and figured a great place to discuss.  I actually dabble in solar stuff but never really had the perfect strategy for battery banks because people live in this perfect world where you bulk charge, reach boost charge levels, then float.  In reality, there is always some variable demand which can bounce bank voltages around, making it tough to get right. 

I am using my own RV bank for example here.  I have 5, 200ah, 12V AGMs.  They are actually designed to be UPS radio tower batteries.  OEM does not really rate them for what I am doing.  Generally it takes most of a day to get voltage levels beyond 14V so I have controller just set to run to 14.4V.  I understand that they should be disconnected at .01C or reduced to float, but things like a heater blower will come on and drop that back in the 13s.  For instance, as I am looking at it now, I was at 6A charge level, 14.4V, which is fully charged, or should be.  But I know the sun will be gone in 1hr or some load will kick on and pull that back within 30min. 

Anyone have a good strategy that is both safe for the batteries, and doesn't undercharge them? 

The float V  from the OEM is actually 13.6, not 13.8 for some reason, but recommends occasional boost charge at 14.4 for no more than 24hrs.....?  I mean, normally there is no way to get there.  At most, maybe 3hrs, but I always have concerns. 

Thoughts?  I don't really think the OEM wants to say anything other than "these are UPS batts", but are most certainly deep cycle.