Yes, you can mix different wattage solar panels. " 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. 12v, tracer bn 4215 controller. Could I add more of these to existing array so that 200 would give more mileage on the same surface area? I would actually prefer to buy elsewhere than. Yes, you can combine solar panels with different wattages in the same system, but it's generally not recommended due to efficiency losses. While it is technically possible, it is not generally advised due to reduced efficiency and power output. However, to maximize efficiency, they should have the same voltage and current specifications.