Product Guide Solar Photovoltaic New solar panels incorporate small changes to improve durability and performance. Sunpower’s Maxeon cells use the company’s unique glass, monocrystalline cells, and a copper backing to reach more than 21% efficiency. Image: Sunpower Behind the recommendations Related articles Behind the recommendations Related articles Solar Photovoltaic PV with the best real-world specs: high warranted minimum power ratings and PTC efficiency ratings More about Solar Photovoltaic Five Reasons to Be Optimistic About Solar Energy Commercial-scale solar energy, buoyed by battery storage, is continuing to grow, redefining how we produce and use energy. California Could Go Solar Without Destroying Habitat If PV were installed only in developed locations throughout California, the state could meets its energy needs three to five times over.