This master thesis describes a new method for the measurement of maximum power point tracking (MPPT) photovoltaic (PV) charge controller efficiency. The method was successfully applied and is proposed as a draft for a new standard. The efficiency measurements presented in this thesis review the efficiency of modern MPPT PV charge controller. The analysis of MPPT methods provides new insights into which algorithms are used in practice. MPPT charge controllers are increasingly used in off-grid power applications due to technological development and market trends. In comparison to conventional PV charge controllers, they make system design more flexible and allow higher energy yields, although investment costs are higher. Until now, no standard for the measurement and specification of MPPT charge controller efficiencies exists. Besides that, there are very few scientific papers analysing the efficiency of MPPT charge controllers and none are studying the type and performance of MPPT algorithms used in practice. This thesis investigates how MPPT charge controller efficiency can be measured, how efficient current charge controllers are and which MPPT algorithms are used in practice. In the scope of this thesis, the efficiencies of 5 MPPT charge controllers from different manufacturers and of different capacity were measured. For these tests, the Fraunhofer ISE test standard for the measurement of MPPT charge controller efficiency was developed. It provided reproducible results and allowed the comparison of different devices. For the measurement of the MPPT charge controller efficiencies, a test rig was developed at the Fraunhofer Institute for Solar Energy Systems ISE. In this thesis the implemented measurement methods as well as simulation and measurement processes are described. With European overall efficiencies above 96 % and dynamic MPPT efficiencies above 98 %, 3 out of the 5 tested MPPT charge controllers were found to be good. The analysis of the MPPT algorithms shows that all charge controllers utilize a combination of different MPPT methods.