"prstlk".....First, washing your coach most likely caused the switch to fail.....that has been reported hear several times.
You don't provide some needed info.....what inverter do you have, size and MSW or PSW? The Samsung refers work well with MSW inverters. I did the same as "horizon36" and added a Magnum 600 watt inverter which has pass through capability. I like the idea of running the refer on it's own inverter, pus it gives you a back up.
Many people are converting the Monaco coaches to a residential refer and most are using the original four 6 volt batteries and do fine. On my Monaco, I also added a rack above the four 6 volt batteries and added two more.
Typically, the refer will do fine with a couple of hours of charging in the AM during breakfast and one hour in the PM.