What else might you need an inverter for? You may wish to consider calculating your total load. What size boat is this and what else might you need one for? What is your battery
capacity? If it is only for a cell phone or laptop
, the above comments make sense, but perhaps you will consider a heavier, higher output device. A coffee maker or microwave usually need about 1000 watts. The big thing will be staying cool in the summer but an inverter will not likely help there. My only experience with them dictates NOT to buy a Kisae. We installed one and it failed. We installed a second and it failed. So each time was a challenge but West Marine
took both and sent them back. Now I got a Magnum and it is working fine.