Solar panels of different watts should not be used together because they have different voltages and amps. The system will always choose the lowest voltage or amp, which will reduce efficiency and power output. " Explore the electrical science behind mixing panels, learn which connection methods work best, and discover the technologies that can help your mixed-panel system perform at near-perfect efficiency. Though mixing different solar panels is not recommended, it's not forbidden and things would be ok as long as each panel's electrical parameters (voltage. . This article will delve into the intricacies of connecting solar panels with different wattages.