Why do you want to operate a 48V system… and not go for 24V, for example… there are already projects like that here. Do you have large loads that you absolutely want and need to have on the 48V side?
The problem will be charging the 48V bank. PV modules will only have the necessary start-up voltage for the MPPT in series connection… or do you have drive machines that are supposed to take over the charging? Or perhaps a shore connection… via a Multiplus, etc.?