We have an Air X 403 connected to our house batteries (HOUSE, not boat) which consists of 1320 aH of golf cart batteries.
I routinely see 400 watts output in 30 knot
winds when the grid goes down.
We run the whole house off this system.
It consists of an 1800 watt sine wave inverter
(regretfully a Xantrex I repaired before I knew better) minus 220 volt loads.
As far as the boat?
batteries, LED lighting
and Aerogel insulation
in the fridge and hot water
See the thread on "LiFePo4 batteries for house bank", and various Aerogel for refrigeration
I learned a lot.
Now with 320 watts of solar
, we have ONLY ONE 200 aH battery bank and never need to run the engine
for power !!!
Thanks CF !