Yeah it’s usually just 3-6ft on the edges of the roof. But this whole roof is tiny. Covering a 12x12 roof would be much less than one edge run on a big house .

Yeah it’s usually just 3-6ft on the edges of the roof. But this whole roof is tiny. Covering a 12x12 roof would be much less than one edge run on a big house . Also they only turn on when there’s actual snow falling so doesn’t use as much power as you might think