40pcs 52x76mm Solar Cell for DIY 20Watts 18V Solar Panel Poly Solar Cells Power 25 watts DIY solar cells Average 0.62 watts per cell; High efficiency up to 17.6%. bus wire( connecting all the solar cell array to a whole solar panel, we call bussing) DIY Solar panel :100w 150w 200w 240w, 245w, 250w, 255w, 260w, 285w, 295w, 300w, 305w, 310w