[bloodhunter]

Sailguy40,
Not much to add to SailingDog's good info just one suggest one more thing. Before you do anything else do an electricity use audit. In other words write down all the devices you have that use electricity along with the estimated hours of use per day for each device (for example you have an anchor light that runs for 6 hours and it draws 1.5 amps/hour = 9 amps) Use sailguy26 you guys aren't related are you?) formula for converting watts to amps if needed. Add all this up and it will give youi at least a first cut at what size battery bank you need. Then you can start planning how to set it up.