Fitting a Larger Alternator

Hi all.

I have done a search and not found any info on this so thought i would start a new thread and ask.

I want to fit a second and third battery to my vivaro in order to use it for leisure purposes and also for a large stereo setup in the near future

I know about split charging circuits and am happy fitting them. what i would like to know is has anyone had any success fitting larger output or secondary alternators to a standard 1.9 Dti engine?

I have found a couple of threads where...

Fitting a Larger Alternator