Efficiency Of A Solar Heating Panel

The efficiency and effectiveness of a solar water heating system will depend on the size and type of panels used and on positioning them to maximise absorption of solar radiation.

Efficiency of a solar heating panel.

The average efficiency of solar panels falls between the 17 to 19 percent efficiency range. The higher the value the more energy efficient the system. If a solar panel has 20 percent efficiency that means it s capable of converting 20 percent of the sunshine hitting it into electricity. The values range from 1 to 11 with most residential systems having a water heater efficiency of 2 or 3.

The highest efficiency solar panels on the market today can reach almost 23 percent efficiency. As the temperature of the solar panel increases its output current increases exponentially while the voltage output is reduced linearly. Solar energy factors range from 1 0 to 11. Use the solar energy factor sef and solar fraction sf to determine a solar water heater s energy efficiency.

The solar energy factor is defined as the energy delivered by the system divided by the electrical or gas energy put into the system. That means the solar thermal system contributes more to water heating so less conventional energy is required. Most solar panels are between 15 and 20 efficient with outliers on either side of the range. Photovoltaic modules are tested at a temperature of 25 degrees c stc about 77 degrees f and depending on their installed location heat can reduce output efficiency by 10 25.