It is a light duty unit.... had two which only lasted half a year or less each. Got a 1200 unit which has been in service for more than 17 months.
They do have a significant loss so when not in use, unplug them. Never leave them on just to charge something like a phone all the time... it will kill a battery.
I prefer a sailboat to a motorboat, and it is my belief that boat sailing is a finer, more difficult, and sturdier art than running a motor.... Jack London