Michael:
Where are you located ?.
To avoid SPAMS, my address is modified, so you need to replace the -at- & -dot- with @ and . to complete the email address -- sorry I forgot to mention it to you.
Don't be nervous, this group is quite helpful, though we may twist some ears once in a while.
WHAT IS "several of the 105's are using much less water then usually" FOR YOU . ?
Be specific and detail it, as much as, possible .
Hygrometer readings are the BEST insurance for GOOD Battery life .
Battery having low hygro readings indicate that you need to charge them for longer time, also if the hygro readings between the cells in a Battery are more than 12 to 15 point differential is best for the battery to receive a good long equalization charge ( some times it may need up to 4 of those equalization charges, one after another.
Can you inform, as well, the battery voltages with at least 2 decimal places of accuracy.
A good quality hygrometer may be good for your system, I will tell you later if so.
I need better description of your charger and the charging profile it may have ( voltages, initial current, and times).
Most of the battery salvage steps are done "UNDER" experience and as well trying different things when the batteries were going dead -- the manufacturers indicate charging but do not show how to "salvage" a battery to attain much longer life.
Tell the costs of the GRID power when OFF PEAK and when ON PEAK (0.20 ).
Also, tell me how much power or energy you use when ON PEAK from the batteries, be as accurate as possible.
The GTFX3048 is a GRID tied converter, why are you suing this model ?.
The 105 2 banks in parallel; are they about 800 Amp-hour total ?.
If so you need a minimum of around 60 to 80 amps charging current -- check me on this -- I may be wrong .
Detail your charging profile carefully.
Regards
Nando