First my boat is much smaller than yours but what I have done will address your problem:
1) Okay I lied, this first one I haven't done, not because I don't want to but because my new repowered Merc engine has a problem with replacing the alternator (so Mercury has advised me). The way to solve the problem I have is to add another higher powered alternator, think 140 amp or larger.
Here in the Pacific Northwest, BC and Alaska, we boaters are the king of gunkholing at anchor. Many of us hate generators, I do after using one often in my Winnebago 32 foot motorhome. The only good generator is a dead generator. And all those of you who insist your generator is really quiet, no it isn't. While refitting I wanted to turn my boat into a lean mean cruising machine with no generator.
I don't need to or have for that matter, the big electrical toys like washer and dryer, ice machine (but I have an alternative), etc. But I can run smaller demanding electrical goodies for a short period of time. The tv for a couple of hours, the hair blower set on medium or low for ten minutes, a two slice cheap toaster (usually around 900 watts or less) for ten minutes a day. And occasionally my convection oven, a cheaper one that is rated at 1200 watts, remember this doesn't always draw 1200 watts as it cycles on and off in the hour I can cook a roasting chicken in it (but I usually use the BBQ for this).
2) I have the typical Norcold fridge, not that big with a pathetically small freezer. So I added a Norcold dedicated freezer, not that large but ample for a cruise up to one week of frozen stuff. If I was going longer, I'd have 15 of those blue freezy thingies (impressed with my technical know how?) I would use a large expensive cooler and swap out five of the blue thingies three times a day to get a more storage for longer trips. But you will be fine at the ability to last a week.
My Norcold freezer:
Norcold DEF788B | Fisheries Supply
3) I changed out four led acid batteries, relatively new mind you, with 6 Firefly batteries. I could have gone lithium, but when you go lithium its not just the batteries but you have to install a lithium electrical system. Six Firefly batteries is equivalent to twelve leaded acid batteries.
A short blurb on Firefly batteries:
4) Since I was in refit, I had one inch foam added and surrounding my refrigerator and my freezer.
5) I added three 100 watt panels (would have preferred four, but visually it wouldn't have looked good, so three it was) for solar power. I am hesitant to say how much power will be generated but roughly 30 amps per day per panel, so I should get roughly 90 amps per day on a sunny day. But this varies with weather conditions and north/south location. The more north you go the more sun you get in the summer.
A quick blurb: [Note: not me]
ACTUAL SOLAR POWER GENERATED
So far, we’ve been working with the assumption that a 100 watt solar panel will generate 100 watts of power. But as we noted in Understanding Capacity, it won’t. There are numerous factors that affect the actual amount of solar power generated, from the time of day to the ambient temperature to the cloud cover to the level of pollution.
Fortunately, experts have come up with a rule of thumb. On average, a 100 watt solar panel will generate 30 amp-hours per day. If you need more specifics, you can find quite a few free solar position calculators online, or you can go with the National Renewable Energy Lab’s free solar power energy calculator at PVWatts. It isn’t perfect, but it is remarkably close most of the time.
5) I have added Efoy fuel cell technology, the largest being the 210 Efoy generating which will provide up to 180 amps per day. Because the fuel cells are not cheap, not to bad but prefer to keep the usage down per day, I added the solar to help out. Between the Efoy and solar, if both are going full out, I can generate roughly 270 amps per day.
I use propane where and when I can, so propane stove, BBQ, and I have a propane heater. But I also have diesel heat so the propane is only for times when I need it for whatever dire reason. The diesel heater also heats the hot water.
I equipped my boat thusly so I could also carry out off season boating on the hook. So my Efoy will be used more, less sun for solar with more cloudy and rainy days. Heat so I am comfortable. And a kicker electrical heater to use electricity when I am tied up at a marina.
