I did a 600 watt PSW installed with a ATF (whole house). It disables the convertor when the power transfers.
I find that we can do a LOT with 600 watts. Our TT has 3 TVs, and batteries for cell phones, laptops and 4 dog collars all being used at will. In addition other loads such as my electric shaver are used as needed. It is a seamless transition from one power source to another, and we really like the conveinence of all outlets being available at all times... BONUS!! The microwave clock keeps time now!
The install went really well. The inverter about 2-3' from the batteries and a 15 amp AC line from it to the ATF located next to the convertor.
I would say that the install takes above average skills, but is not terribly difficult