I have to agree with Cheechako re TransmitterDan's response, technical stuff quiet often comes across this way with no intent on the authors part to be snobish or condescending.
There are a number of reasons one may feel obliged to install a large hour amp capacity battery bank.
In my case I feel that I am not doing as much damage to the batteries if I only use 20 -25% of the available discharge, and, I like having the capacity to carry me thru a few days of overcast weather
without having to resort to engine
driven recharge methods, and, I don't like having to replace batteries on too short of intervals.
I recently replaced a Trojan that had been in service
for seven years as part of a 4 bank installation
. Before extending my spread to 4 banks I had been getting only a year, or even less out of the batteries of just one bank.
Like a lot of other stuff I am finding that battery chargers seem to have a fairly short life aboard a boat and the high ampage ones are very expensive.
Having tired of buying
battery chargers I am in the process of converting an old AC transformer welder into a high ampage DC source which I will feed to my solar
regulators in parallel with the solar panel supply. The conversion involves reducing the number of secondary windings to lower the output voltage of the transformer and a bank of four 60 amp diode bridges to rectify the AC output. I have a 2.2kw 240V genset to power this arrangement from. Hopefully, in my case, this will take care of the large charging system as DonL has suggested.