This is a vector model at 750 watts and at 1400 watt surge. So far it's been very dependable and I have a large solar panel, probably around 2500 to 3000 watts. My panels are a mixture of Carrizo, Arco, and Unisolar.They are all hooked up together and the Carrizos are in 4 series.(Carrizos are 6 volt panels)I have at least 9 more Carrizo panels that I need to place them into series and add them to my system.It pays off when the electricity bill comes because we only pay like 3.00 US dollars every month!!! I mostly use solar about 95% of the time. We have electric but only run our refrigerator and that's it. Sometimes in the summer, when the electricity goes off in our small community, we will be the only ones with lights! I usually just smile out my window and watch my Showtime!