My last boat I went from St. Maarten to Ft Lauderdale. We took two months as we enjoyed stopping and staying. We did find out that AC was necessary in order to be comfortable given the large windows onboard. My new boat has larger windows. So as much as I hate to run AC, it will, unfortunately, be necessary.
Batteries are lithium, so the power is there. Engine start batteries though are remaining as AGM.
Running the dryer just at the Marina is not a bad idea actually at all. As our longest offshore passage is from Dominican Republic to Bonaire. Well, unless I can pull off 3 to 4 miles to the gallon and starlink works as it should, then it may be a pit stop in the Galapagos, but other than that, not long passages. Cruise speed for my boat is 14 kts, but I intend to keep it maybe 7 to 8 kts for fuel efficiency.
I have been thinking about a gas stove as well, but have decided against it, for two reasons. The first reason is the obvious fire hazard and the second reason is that a gas stove actually heats up the galley quite a bit. So then you have a gas heater working against an airconditioning. I did not think that was a clever idea, so I changed from electrical cooking to induction and I can control the 'heat' in the induction plate perfectly, so can highly recommend it.
Am sure you made the power calculations correctly, but 150 Kw per day for a 65' boat sounds a bit heavy to me. Our boat also has lots of goodies on board, but don't get anywhere close to your electricity usage. You may want to look at that again. Unless you are with 10 persons on board I think your usage will be much less.
Most of the equipment you can run while underway and thus the alternators will provide the power, so no need for the generator to run. E.g. we only run our dish washer, washing machine and water maker while underway. We never run that while on anchor.
You can also ask yourself if you really need 2 ice makers ? They use quite a bit of energy and is that really necessary ?
The airco is of course a big one, but there is a way to lower the need. One way to lower the need for air conditioning is eg the use of curtains or shades in front of the windows on the outside of the boat. On my boat I have see through sun shades hanging from the dinghy deck to the railing. The shades are not directly in front of the windows (about 50 cm away from them). I can still see through them, but direct sunlight does not get into the salon and galley anymore. There is no hot air behind the shades since the wind takes that hot air away. In good weather we always use the fly bridge, never steer from the pilot house, so the covers are on the windows basically all the time. That drops the temperature drastically.
While underway we just have the pilot house, fly bridge and rear door to the salon open and with those sun shades it is nice and fresh. And this is in Greece where we have 110 - 120 degrees in summer time, but we did not use the airco at all in the salon. just the airco in the bedroom was in use for a bit, but that was just 1 airco instead of the three that we have. Without those shades we need air conditioning. I will try to find a picture of it, can highly recommend it.
As for Victron. I can highly recommend them. Am currently installing a complete Victron system, which means inverters, chargers, mppt controllers, monitoring, bmv, the whole works.
I decided for a Victron Quattro 24/8000 and the good part is that you can string Victron inverters. In other words I could install a second one and divide the load of the boat over the two of them. Victron has a 48 / 15000 Quattro, so with 2 of them you would end up with 30.000 VA at 48 V which would be 625 A and that is quite a lot.
There are some things to take into consideration when stringing them, but any good electrician should know about that.
Another positive part about Victron is that they have service stations almost everywhere, so they can help you whenever necessary.
And lastly some bad news. I saw you want to go to Bonaire, but I have to advise you it is not worth the hassle. I live on the island of Curacao (which is next to Bonaire) and the seas are not for boating. This part of the Caribbean is known for a short, but high, wave, with strong currents. As long as you go East to West it is sort of Ok, but any other direction............forget it, you can actually destroy your boat doing that route and I have seen that happening as well.
For that reason we don't see a lot of motor yachts coming to our islands. Only some mega yachts show up during hurricane season, lying a couple of months down town, never going out to sea.
Yes we do have sailing yachts which just crossed the ocean, but the majority stays in the Northern Caribbean. The motor yachts we do have on the islands basically only go from Spanish Water to Fuik Bay and that is about it. Even going along the South coast is very unpleasant, with regularly 10 - 15' waves.
We do have a period of the year the seas are calmer, that is September, but trust me, you don't want to be here in September. There is hardly any wind and temperatures quickly go up to well over 100 degrees, not fun at all.
If you want to see the ABC islands I would advise to simply take a plane and fly over, will be much more enjoyable. It also saves you the crossing from the North to the South Caribbean, which normally has enormous swells with cross pattern waves. I used to fly for the Coast Guard, it was our area of operation and from experience I know there is only a very small window of time when the seas are calm enough to make a crossing pleasurable.
