Update 7/29/13
After a couple of trips out I decided that my stock batteries were not performing adequately. A single day of normal use starting from full would knock them down to under 12V by bedtime and that was much worse than last summer. So I swapped them out for a pair of Costco 6V golf cart batteries. I think these have me at 220 Ah and I can definitely tell that I have a lot more capacity now. Now after a solid day's use starting from full still has me in the 12.3-12.4V range, and after a night of furnace use I'm still in the low 12's in the morning.
Still have the same inverter and while I haven't done the troubleshooting to see if these new batteries experience the same voltage spike, the inverter still faults out at voltages approaching 15V.
Based on the rule of thumb on these forums of charging Trojan 6V GC's at 14.8V, I want to try and hit that level on these Costco 6V GC's regularly without impacting my inverter usage too much. My charging profile is still 14.25V for the bulk/absorption setpoint, switching to float when duty cycle is <15% for 10 min (same profile as before). No temp compensation at below 75 degrees F. But now I'm using the auto-equalize feature to do 14.9V for one hour every 5 days (also bumped up the HVD to accommodate this). That way I know that at least weekly it should hit that higher voltage charging level (assuming the batteries are "full" with regards to the 14.25V charging profile as it sits parked at home), but it shouldn't be so often that it impacts a camping weeking too much. Plus it is easy to cancel the equalization if needed by hitting the reset button on the controller. I can also initiate the equalization via the reset button which I have done the day before setting off a couple times now, just for piece of mind.
