G12R-based modules are solar panels built using G12R (210R) size silicon wafers, a newer rectangular wafer format developed to improve module efficiency and manufacturing economics. In comparison, M10 modules use 182 mm square wafers, which have been widely used in the solar industry over the past few years.

The key difference lies in wafer size and shape: G12R wafers are slightly larger and rectangular, allowing manufacturers to design modules with higher power output while maintaining manageable module dimensions for installation and transport. Because of this design, G12R modules can deliver higher wattage, better cell packing density, and improved production efficiency, while also helping reduce costs by lowering material usage and improving line utilization.

These advantages are why many manufacturers see G12R as a next-generation mainstream format, especially as the industry moves toward high-efficiency N-type TOPCon technologies.