Performance Expectations: How Much Energy Can I Generate In A Typical Day?

Understanding Sun Hours and Energy Generation

Sun hours, also known as peak sun hours, measure the amount of solar energy received by a location in a day. This varies greatly depending on the latitude and weather patterns. In the United States, sun hours per day range from around 6 hours in the Pacific Northwest to over 7 hours in the Southwest and Desert regions. For instance, Phoenix, Arizona receives around 7.8 hours of peak sun hours per day, while Portland, Oregon receives about 4.7 hours.

Estimating Daily Energy Generation

To estimate daily energy generation, you can use a simple formula that considers the solar array’s wattage, efficiency, and sun hours per day. A 5 kW solar array with an efficiency of 18% and operating in Phoenix, Arizona might generate around 30-35 kWh of energy per day, assuming 7.8 hours of peak sun hours. Conversely, the same array in Seattle, Washington might only produce around 15-18 kWh of energy per day, considering the lower sun hours.

Factors Affecting Energy Generation

Several factors can affect the actual energy generated by a solar array, including the array’s orientation, shading, and temperature. Proper installation and maintenance are crucial to ensure optimal performance. In addition, using energy storage systems, such as batteries, can help offset energy shortfalls during prolonged periods of low sun hours or at night.