... feet), Costing: $20 USD. It is used to connect the cells.3). Bus wires: 4 meters( 13.12 feet). Costing: ... Costing $15 USD. The cells are all grade A. 4.0W average per cells.These solar cells have never been used.. We ... are confident on the quality of it. Technical parameter of cells: Pmp(w): 4.0WVmp(v): 0.52Imp(a): ... (v): 0.621Isc(a): 8.26 POLY 6x6 solar cells DIY kit for solar panel, flux pen, diode bus ...