Resumen: Total or partial shading conditions have a detrimental impact in the output energy of photovoltaic (PV) systems and in the semiconductor materials PV technologies are made of. Residential PV installations are very likely to be exposed to shade projected by nearby objects such as buildings or neighboring trees. The electrical configuration of PV systems is crucial to mitigate the shading effect, as it is the use of power optimizers. This study assesses the shading impact on two different types of residential PV systems to verify gains associated with SolarEdge optimizers and support product marketing. It aspires to help PV owners select power inverters that maximize the annual energy produced. Experiments have been performed simulating snow coverage and tree shading on a string-based system (Fronius) and an optimizer-based system (SolarEdge). Findings demonstrated the decrease in losses from partial shading conditions with power optimizers. SolarEdge optimizers reduce shading power losses from 50% to 29% in comparison to a standard string system when simulated snow coverage is applied. Results also showed that SolarEdge system decreased tree shading losses from 17% to 13% in comparison to string-based system.