This document highlights the problem of incompatibility of connectors for DC-application inphotovoltaic systems (DC connectors) produced by different manufacturers. It addresses fourparticular issues in that context: background information on incompatibility of DC connectors from different manufacturers; observations and challenges concerning the handling of DC connectors from differentmanufacturers; stakeholders concerned by the incompatibility of DC connectors; recommendations for long-term standardization and interim measures to address incompatibility of DC connectors.