ewarnerusa wrote:
Another detail I have not yet mentioned, I had to add almost a gallon of distilled water between the 2 batteries this spring to top them off. The top of the plates was just above the water level prior topping off. The batteries have always been left in place on the TT and until recently at the Morningstar's stock 14.60V charging algorithm with full temperature compensation and automatic equalization every 28 days (15.3V for 3 hours). We had a typical Montana winter, although not as many arctic cold periods as usual.
The lower absorption voltage will conserve water. 2 batteries, 2 yrs, 1 gallon seems like a lot of water. Another reason to cut absorption time to a minimum (5 to 30 minutes) while keeping the modulation % low (20% - 10%). In storage this will be reached quickly, while in use the time will be extended significantly before you move to float.
Also consider going 90 days and just 60 minutes on the equalize. I would also consider 14.8 - 15.0 volts range as I believe 15.3 is at the very max the fridge is supposed to tolerate.
Mine is set 14.9 and just manual operation.
