Bay Pelican
Moderator Emeritus
Search the mfg literature before purchase to find out what is required to winterize the unit .
Some might be easier than others.
The most modern clothes washers and dish washers have computers that might not like an inverter , and most require a very long time for the operation.
The computer boards on the clothes washers and dish washers are sensitive to inverters. This is not only an issue for modified versus true sine wave but the true sine wave output of the various models of the same manufacturer. If possible try to find another boater who has run the intended dish washer off the same model inverter you have. Of specific concern is the peak power needed to start the motors on the clothes and dish washers. This peak power requirement may be multiples of the rated wattage for the unit.