Quick Answer
When solar panels face east, their efficiency is reduced due to the lower angle of incidence, which results in less direct sunlight hitting the panels. This can lead to a 20-30% decrease in energy production compared to panels facing south. East-facing panels still generate electricity, but at a lower capacity.
Solar Panel Angles and Efficiency
The ideal solar panel angle for maximum energy production is between 30° and 40°, with south-facing panels receiving the most direct sunlight. East-facing panels, on the other hand, receive less direct sunlight due to the lower angle of incidence, resulting in reduced energy production. For every degree the panel is tilted away from the optimal angle, energy production decreases by about 0.5-1%.
East-Facing Panel Efficiency
Assuming a standard solar panel efficiency of 20%, an east-facing panel with a 30° angle of incidence might only produce around 14-15% of its maximum potential energy. This is because the lower angle of incidence results in less direct sunlight hitting the panels, reducing the photovoltaic effect and, subsequently, energy production. To mitigate this, consider using a panel tracker that adjusts the panel’s angle throughout the day to maximize energy production.
Adjusting for East-Facing Panels
If installing east-facing panels, consider using a panel angle of around 20-25° to optimize energy production. Additionally, ensure proper cleaning and maintenance to minimize dirt and debris accumulation, which can further reduce energy production. In some cases, a south-facing panel might be more suitable, even if it’s not directly facing the sun, to maximize energy production.
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