Active load combined with an infinityPV SMU and infinityPV software allow you to measure and keep photovoltaic devices at the maximum power point during operation (MPPT). The initial values at the MPP are obtained from a user predefined IV-scan and the SMU then rest at at the MPP. As the MPP of the device change over time we have integrated a function where the MPP is determined periodically, hereby making sure that the system always operate as close to MPP as possible.