Mono-PERC: When we combine two of the best technologies in the market, they provide even higher energy efficiency of up to 22% and justifies high capital expenditure of a retail solar power system. What does PERC mean? Literally, it stands for Passivated Emitter and Rear Cell. Mono PERC Solar Panels are ideal for Commercial and Utility-scale Projects due to the technology that combines rear wafer surface passivation and local rear contacts to maximise light capture. Perc Modules have two definitive product advantages – Higher energy density– lower levelled energy cost leads to lower payback periods. Better flexibility – provides the end-users with more tilt and placement options without sacrificing efficiency.