Example methods and systems described herein include periodically adjusting load applied to a power generating device according to a testing cycle, detecting a peak power point of the power generating device and an associated load that results in the peak power point, adjusting the load applied to the power generating device to match the associated load that results in the peak power point, and based on the adjusted load drawing power outside of a threshold amount of the peak power point, (i) calculating a correction factor to apply to a reference voltage of the power generating device and (ii) adjusting a frequency of the testing cycle.