Fraunhofer Institute for Solar Energy Systems ISE, a Germany-based research organisation, is studying the SeVen project to optimise efficiency and curb PV plant costs. The research is focusing on medium-voltage design concepts that promote more resource-efficient system deployment. It is specifically evaluating voltage increases from 400 V and 880 V to above 1000 V to reduce currents and enable smaller cable cross-sections. Fraunhofer ISE is designing a comprehensive concept for PV systems above five MW that includes demonstrator inverters and string combiners planned for testing in a multi-megawatt laboratory. Expected reductions include 20% in heat sinks, 75% in cables and 30% in copper and ferrite materials, alongside further work on DC-side integration and enhanced analytical functions. Forward steps involve comparing voltage levels, building prototypes and conducting evaluations with KACO New Energy GmbH, SUMIDA Components & Modules GmbH, Streamergy GmbH and BayWa r.e. Solar Projects GmbH.