That will be a stupidity.....
Whats the logic of using such bigger batteries,If you don't have proper charging source...?
You can look at Faheel setup....He is using around 1year old 50amp battery,but his alt is treat for Spl setups......(Voltage is not dropping below 13.5v)....!
And his amp is thrice time more power hungry as compared to SA F2500D........!
It dose not mean that you cannot run F2500D with 4x batteries......But the reality is that (This idea is not good) 
I hope you got my point!