Just wanted to give an update. We left the boat on the hard
from mid May through December with the Xantrex TrueCharge 40+ turned on. When we arrived in late December the three Trojan T-1275s, which are just one year old, had no noticeable water loss. I added very little distilled water to each cell but it was probably unnecessary. I was also surprised to see that each cell's specific gravity tested higher than when i finished equalizing just before the layup
. It appears that good batteries and a good multi-stage smart charger mean minimal water loss.