Join Date: Mar 2010
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For the Marathon marina it's $135 a month which includes the showers, dingy dock, parking space and 1 pump out a week.
There are fines for dumping waste overboard. Expect the coast guard to give you surprise inspections and if your holding tank system isn't setup to prevent overboard discharge, you'll get a hefty fine.
Whether or not you can live off of solar really depends on what your electrical needs are. Ditto with the "hard living" bit. Some people are happy sitting back in their cockpit reading their Kindle drinking warm beer. Others want a full sized fridge with ice maker and a large HDTV they can watch 10 hours a day. Both lifestyles are supportable.
You're really putting the cart before the horse with the 50ft yacht idea. You really need to lay out what your goals are, what's the lifestyle you want, and pick the right boat for that. Boats are purpose built. You don't just buy a boat and try to jam it into your lifestyle. You buy the boat that fits the lifestyle you want to live.
You'd probably be much better off just putting together a list of "this is what I want to do, how I want to live while aboard, what my budget is" and posting that. The people here all have a lot of experience on the water and would be able to steer you towards the right boat and setup which would meet those goals.