To the OP, it depends on what you're going to use the inverter to power. In my case, I use a 300w Samlex PSW inverter to power only the tvs and maybe a dvd player. For this use the 300w inverter is kind of the sweet spot. I, and several other members on this board have the inverters 120v output wired to a receptacle and plug the shore cord into the receptacle, powering all the outlets in the trailer. I turn off the converter/charger, and everything else except the breaker that powers the AC outlets in the trailer. This keeps wiring to a minimum and reduces cost quite a bit.