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ITFrequently Asked Questions · Solar
What is MPPT in a solar inverter?
Maximum Power Point Tracking is a technology that optimizes the energy produced by solar (PV) panels.
A solar panel does not deliver the same power at every operating voltage. For each combination of sunlight and temperature there is one specific point of voltage and current where power is at its maximum. That point keeps moving during the day, as clouds pass or as the panels heat up.
The inverter's MPPT controller constantly adjusts the load the panels "see" and finds that point in real time. Without it, the array would run at a voltage that is not optimal, and part of the available energy would be lost, especially in low light.
Many inverters have two or more independent MPPT controllers. This lets you connect strings of panels with different orientation, tilt or number of panels without one holding the other back.
A common mistake is connecting panels that face different directions, such as east and west, to the same MPPT controller. When designing the system, also check that each string's voltage falls within the inverter's MPPT operating range, not just below its maximum permitted input voltage.
