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Depends on how you plan to heat. If you're thinking electric heat, you'll need at least one 30A line pretty much dedicated to heating. Reverse-cycle A/Cs draw a little less when heating, but are only efficient down to about 36-38F water temp. Some A/Cs, like the Flagship series, have an optional big electric coil for heating. Draws about 18A and works like a charm...I have two on my 42' sloop. Just one of them keeps the boat reasonably warm all winter, except for the really cold nights (under 20F and blowing) when I add a diesel-air heater (Espar).
If your electricity isn't completely reliable, you'll need another, or secondary, means of heating: stove, diesel-air, etc.
For your creature comforts....lighting, frig, batt. charger, TV, stereo, microwave, etc., one 30A circuit should be enough.
Assume you'll be cooking with propane. An electric stove would complicate things somewhat.
Two weeks and $5,000 labor sounds like it's in the ballpark. Be sure to do it right, with a licensed/certified marine electrician and top quality materials. This isn't something to cut corners on, IMHO.
Last edited by btrayfors; 03-12-2010 at 02:26 PM.