Considering the weight of batteries, the cost to replace, the additional power required to move the boat due to the weight, the lack of space... Would it make more sense to have a much smaller battery system designed for short peak loads (e.g. hair dryer or A/C and microwave coming on together) and run a genset continuously? Think of a small efficient genset connected with a standard uninterruptible power supply designed/loaded for 10 minutes of use. (I would think from a redundancy you would want two gensets, but I digress).
Additionally, for those with A/C has anyone looked at ice storage and thermal loading? (for those who do not know, have the a/c generate ice blocks at night when power is cheap and use the ice in place of second stage on a/c when OAT at the highest).
Tim