Stand-alone operation of photovoltaic modules excludes any access to a public mains grid. This kind of photovoltaic usage is chosen typically for applications in remote locations.
ET 250.02 is conceptualized as an extension for ET 250 and provides typical components for stand-alone photovoltaic systems. This includes a charge controller, an inverter, and an accumulator as storage for electricity. These components enable conversion of the solar electricity, provide supply on demand, and ensure system safety.
A connection cable feeds the photovoltaic DC current from ET 250 to the input of ET 250.02. Inside ET 250.02 the DC current passes safety devices and enters the charge controller. The charge controller with maximum power point tracking adapts the voltage level for accumulator charging or for direct consumption. An inverter enables usage of typical AC consumers.
Measurements of current and voltage at predefined points of the system circuit allows detailed energy balances. Thus, the performance of system components under varying demand and supply of electrical power can be studied.
