Temp compensation may not be as important as you think.. Let me look up a factor... Most of the "Generic" battery types including Flooded wet cell and AGM Xantrex uses something like -27mV per Degree C so a 10 degree change is .27 volt.
Progressive Dynamics, on the other hand,,, Simply kicks it into overdrive every 20 hours or so for like 15 minutes. Results are roughly the same. Plus this provides a measure or equalization and desulfacation and of course means you need to add water to your flooded wet cells every once in a while (Annual when new).