Thanks for the replies. I am aware of the whole golf cart battery debate, etc. I was more looking in general to see if 12-12-8 was possible if I got in a bind. I could always replace the 12's later and use them in my other boat or easily sell, etc. I priced the Rolls last year and they were $2,600 for four of them (almost $700 each) and a 6-8 week lead time. Since I have been tossing around selling the boat I don't think I will see the payback. On top of that there was a 6-8 week lead time. Thats probably longer now due to Covid. Piripucha I am interested in how you handled the alternators on the 36 volt setup. Seems like they wouldn't put out enough to charge. I guess the house charger would do as long as the generator was running.