Some Battery Questions...

Ok, so in my original thread I was able to fix the wiring of my batteries to something more proper, at this point I'm trying to figure out some problems I'm having with battery life, (not because of the new wiring).

I have a bank of 3 strings of 105 AH batteries, four 12V batteries per string on a 48V system. At this point I know these batteries are probably rather sulfated because they haven't been maintained at optimal charging periods or percentages.

(A.K.A we had someone move in with us who used way to much electricity for a year causing them to be charged way too many times, too low, probably ruining them.)

My first question is for 12V AGM Batteries:
- What should be the cut in voltage, (low voltage)
- What should be the cut out voltage, (high voltage)
- What should be the Maximum Bulk Charge voltage
- What should be the Float voltage, and how long should the float period last

I think some of these voltages monitored by the inverter are set wrong, causing the batteries to be drained too much and not be charged to full capacity.

Second question is, do appliances/power tools that draw large amounts of Amps, (6-16Amp load) adversely effect battery life since they cause the batteries to drop really low in voltage in order to provide that much electricity for a very short period of time? The reason is because my dad does every construction trade, and we are often using lots of short-time-use power tools on the system. For things like the table-saw and compressor that run for a long time, we use a separate small backup generator.

Ultimately we want to replace all these batteries with one or two much higher capacity battery banks, but we need to make the ones we have work for this winter at least. I want to see if changing some setting will help get them back on track.