TRANSFORMER EFFICIENCY:
According to this article, "
Transformers are the most highly efficient electrical devices. Most of the transformers have full load efficiency between 95% to 98.5% ."
5% of 7,200 watts is 360 watts. The Equi=Tech unit discussed above has left 1,200 watts room between input and output specs which is an 18.2% margin.
http://www.electricaleasy.com/2014/0...fficiency.html