MBB Bifacial Mono PERC Half-cell Double Glass Module Specifications subject to technical changes and tests. JA Solar reserves the right of final interpretation. Assembled with MBB bifacial PERCIUM cells and half-cell configuration, these double glass modules have the capability of converting the incident light from the rear side together with the front side into electricity, providing higher output power, lower temperature coefficient, less shading loss, as well as enhanced tolerance for mechanical loading.