Starting Battery vs. House Battery
Good plan on the battery set up, however a slight improvment could be made.
First, the starting battery should be just that, a Group 24 or 27 will be fine for the Universal 25, had one on my last boat. If you can, use 6v golf cart batteries for the house system Trojan T-105''s, you will need 4. Each bank is connected in series to have 2 banks of 12v capable of very deep discharges and multiple ones. Should get 5 years from the set up. Next, the 35amp alternator on the Universal is too small to charge these batteries fully or any other mix you might come up with. I used a new 105AH alternator and a smart regulator. That is the max you can turn with a single pulley set up, and at that you need to use a Gates Brand belt. When the altrnator kicks in, you''ll take about 300 rpm off the cruise. It''s noticable. This set up served me well running everything on the boat, refer, etc. Good luck.