I am not sure the statement of 100 to 200 usage per day is a good one. I feel you need to calculate what you and your boat will use per day. Usage really depends on what equipment you have on board and what lifestyle you want to have.
Personally, I set up my systems to have frugal energy consumption. I don't have a large refrigerator/freezer; I run a wind vane autopilot; all lights are LED's; most systems are mechanical. I do have an electric windlass. I also have AIS, RADAR and lots of gadgets like cell phones, computers, music. It's actually amazing how much power the gadgets use. I run Starlink but only for about two hours a day because if how much power it eats. But I haven't done the 12V conversion so I have to run the starlink and my inverter for it to run. If you are looking to get star link - look at the new mini - much better than my old system.
I have a 400 amp hour house bank of LiFePo batteries so approximately 360? Amp hours of useable battery power. I almost never let the system go that low. I will recharge at about 30 or 35% remaining battery level. My main charging sources are my solar panel and my alternators. My solar panel is about a 380 amp panel - it usually is putting out in the.mid 200 amp range, or less. I think I've seen a couple days where it was putting out a bit over 300 amps. I have twin alternators that will put out 240 amps, but I throttle them back to 80% output. I think if I had more room in my engine compartment I would put in two much higher output alternators such that I could fully recharge I say 15 minutes rather than the two hours i currently need and then drop the solar panel. But without that space, I will likely see about doubling my solar panel output.
As I'm currently set up, at anchor I am very close to self-sufficient just off my solar. But under way, I can go usually about 4 to 6 days and then I'll need to run my engine to charge.
If I was running an electric autopilot, I would likely have to charge underway almost every day.
Measure your consumption. If looking at solar, figure the real output is 50 to 60% of stated output. Calculate a way to charge your batteries in a fairly short time period if needed. Don't even consider lead acid for a house bank. You can use lead acid for start or windlass batteries, but not your house bank.
Just food for thought.
dj
