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As previously mentioned the battery capacity is critical. I personally use 4 6v golf cart style batteries (in series and then paralleled) with a total capacity of 450 Ah).
Aside from capacity, in my opinion the two biggest bangs for the buck are a simple portable genset like the Honda EU2000i and a high output alternator.
I tie the genset directly to my shore power which leads into my 3 stage battery charger. When running the generator I have my AC outlets, and switch between water heater and battery charger.
I personally use little light, fridge a few hours a day, regular use of water pump, shower pump and what not and my laptop. I will use about 30-90 Ah a day while at anchor which is some 1-4 hours running the genset. When sailing I run more equipment, but usually not the laptop so things even out.
Remember to try and never run your batteries below 50%, in my case that is no more than 225 Ah before a recharge. Keep the batteries maintained with fluids as well so they have long life. The last bit of charge is the slowest as well which is usually better handled by plugging into shore power rather than run the genset or motor.
One last thought as well, it is always a good idea to keep a separate bank of batteries for starting and running the engine to ensure you do not run down the house and cannot start the engine.
Cheers
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