When shopping for solar panels, it's important to consider factors such as the efficiency of the panels, the warranty offered by the manufacturer, and the size and type of the panels. The efficiency of the panels refers to how well they convert sunlight into electricity, and a higher efficiency means that you will need fewer panels to generate the same amount of power. 

Another important factor to consider is the warranty offered by the manufacturer. Solar panels are designed to last for many years, but it's important to have a warranty in case of defects or other problems. A good warranty should last at least 20 to 25 years and should cover both the panels and the installation. 

The size and type of the panels are also important considerations. For example, monocrystalline panels are more efficient and have a longer lifespan than polycrystalline panels, but they are also more expensive. It's important to consider the size and type of panels that are best for your specific needs and budget. 

Overall, when shopping for solar panels, it's important to do your research and choose a reputable supplier that offers high-quality panels and a good warranty. By investing in solar panels, you can reduce your energy costs, help the environment, and take control of your energy future.