Peak sun hours for off-grid homes in the Southwest region?

Determining Peak Sun Hours

To determine peak sun hours, consider the location and time of year. The Southwest region receives abundant sunlight, but this can vary depending on the specific location. For example, Phoenix, Arizona averages 6.8 hours of peak sun per day, while Albuquerque, New Mexico averages 6.2 hours. Understanding these variations is crucial for accurate solar panel sizing.

Solar Panel Sizing for Off-Grid Homes

For a 2000-3000 sq ft off-grid home, a suitable solar panel system size is typically 5-7 kilowatts. This system can support a range of appliances, including a refrigerator, air conditioner, and washing machine. When sizing solar panels, consider the daily energy needs of the home, which can range from 20-30 kilowatt-hours (kWh) per day. A general rule of thumb is to size the system for 20-25% of the total annual energy needs.

System Design Considerations

When designing an off-grid solar panel system, consider the following factors: panel orientation (south-facing for maximum sun exposure), panel angle (between 30-40 degrees to maximize sun absorption), and battery bank size (typically 10-20 kilowatt-hours for a 2000-3000 sq ft home). Battery bank depth of discharge (DOD) should be set at 50% or less to prolong battery lifespan. Additionally, consider the cost of the system, including initial installation and ongoing maintenance costs, to ensure a long-term return on investment.