MPPT sizing

Sizing the MPPT (Maximum Power Point Tracking) trackers for your inverter is a crucial technical step that determines the safety and efficiency of your installation. Incorrect calculations can permanently damage your inverter or drastically limit your production.

This sub-category teaches you all the MPPT sizing calculations: maximum open-circuit voltage (Voc) limits, optimal MPP voltage range, maximum short-circuit current (Isc), thermal corrections, and overpanelling techniques to maximise annual production.

Limits that must be respected: Each inverter has strict MPPT characteristics. The maximum open-circuit voltage (Voc) must NEVER be exceeded, even at the coldest temperatures (-10°C). The MPP voltage range determines where the inverter can extract optimal power (e.g. 90-550V). The short-circuit current (Isc) limits the number of strings in parallel.

Overpanelling: oversize intelligently. Installing 30-50% more panel power than inverter power compensates for losses (temperature, shading, dirt) and maximises production during off-peak hours (morning/evening). Our guides calculate the optimal overpanelling rate according to latitude and orientation, with numerical examples.

Discover our detailed technical tables for Deye (SUN-xK-SG0x, HV), Sofar (HYD-EP3, ME3000), Victron (MultiPlus-II, Quattro) and Fronius (Symo Hybrid) inverters, with recommended string configurations for 400-550Wp panels.