The USB MeterBus Adapter ( UMC-1) converts the Morningstar MeterBus RJ-11 electrical interface to a standard USB 2.0 interface which allows communication between a PC and a Morningstar charge controller or inverters that have a MeterBus connection, but no serial or other communications port. This includes the Sunsaver MPPT, SunSaver DUO, and SureSine products.