I posted a long time ago about the big losses from successive 50-90s and did some additional trails testing on that "progressive capacity loss"
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/24849190.cfmI found that after about five 50-90s the capacity was down too far to get through the next night. The limit being you need enough to get through that night so you can do another 50-90 next morning. Since the regular time we needed a 50-90 was every two days with our particular AH usage, that meant the time limit was ten days to two weeks and we were stuck.
Next step was go home and do "recovery" on the batteries whose SG was so low you couldn't even find it :) Mex is right about the fun it is to do a "recovery" Takes a few days before you can go off-grid again for another ten days or so. One night with hook-ups is not enough time to do a "recovery"
The cure was solar. Shallow cycles and reaching high SOC (but not necessarily to full) means you can go weeks and weeks off-grid and not have progressive capacity loss that you will ever notice. Even so you should do an equalization every month to make sure you can still get back to "baseline SG"
