I have a project in which a client is wanting an outside glass deck floor to be heated to keep from freezing. Below the floor is ambient temperatures. The glass is 1.25 ( 3 layers of 3/8" with a /060 inter-layer between each lite of glass) thick each panel is 30" x 60". I don't want to overpower the units as if we can get away without a control unit it would be much easier as there is over 30 panels. Also we want to watch the total amperage draw.