The conversion rate of solar photovoltaic panels varies, but on average, it lies between 15% and 22%, efficiency is influenced by factors like temperature, sunlight quality, and installation angle, newer technologies are continually being developed to improve this efficiency. Due to the many advances in photovoltaic technology over recent years, the average panel conversio efficiency has increased from 15% to over anels have an efficiency rate of around 15-20%. The longer answer is that the efficiency of your solar. The key metrics of solar panel efficiency ratings include conversion efficiency, temperature coefficient, and power output. Conversion efficiency measures the percentage of sunlight converted into usable electricity.