Analysis of Chile's Extended Producer Responsibility Law (Ley REP) identifies that photovoltaic panels are uniquely measured for EPR compliance targets against estimated residues rather than actual market introduction volumes. This measurement methodology differs from all other product categories regulated under the REP framework, including packaging, electronics, and batteries, which are benchmarked against actual introduced quantities. This inconsistency affects how producers of photovoltaic panels calculate and demonstrate compliance with their producer responsibility obligations, potentially creating different accountability standards within the same regulatory system.