If you can live with 110VAC all the time, buy the $100 version. My boat
requires full time 110/220 so I have a Sears large fridge, a 110V Uline
Ice maker and a 110V deep freeze. replacements are cheaper than repairs
on the other ones.

Adam wrote:
I'm planning to install small refrigerator on my boat - ~4cu.ft.

This kind of household appliance is about $100, marine refrigerator is about
$800

What makes different almost $700?

Adam