Been there, done that
I did this project to my C-36 several years ago. Not too difficult. I worked with Hamilton Ferris to get a hig-output alternator, 3-stage smart regulator, AGM batteries, and a Link 10 monitor.The key is to plan out your system. Make an inventory of your electrical appliances with their power requirements. Knowing what your energy requirements are key to knowing how big your house bank should be and what recharging capacity is necessary. I ended up with a house bank of 2 Group 31 AGMs for over 200 AHs capacity. I should really get a third battery for running my fridge.When you know how much energy you need per day, then the rest is just math. You need at least twice as much but preferrably three times as much for capacity in your battery banks. Then you need to be able to replace your daily usage quickly, prefferably within an hour or two.The other component is an emergency starting battery. I just went to West Marine and got a Group 27 low maintenance sealed battery. It is kept charged up by an Echo Charger, which feeds a low-amp trickle charge from the house bank. Pretty fool-proof system and easy to install.Good luck and just remember to spend a lot of time with the planning. That way, when you get all the components together, it is just a matter of assembling the puzzle pieces.Les Murrays/v Ceilidh'86 C-36 #560