Quick Answer
A minimum solar panel wattage of 5-7 kilowatts is needed for a 2500 sq ft house, assuming an average daily energy usage of 50-70 kilowatt-hours and a peak sun hour rating of 5 hours per day.
Solar Panel Sizing for Off-Grid Houses
When sizing solar panels for an off-grid house, it’s essential to consider the total energy usage of the house. A 2500 sq ft house with an average daily energy usage of 50-70 kilowatt-hours will require a substantial solar panel array. A general rule of thumb is to size the solar panel array to provide 1-2 kilowatt-hours of energy per square foot of living space.
Determining Daily Energy Usage
To determine the required solar panel size, you need to calculate the total daily energy usage of the house. This includes energy usage from appliances, lighting, and other electrical loads. For a 2500 sq ft house, assume an energy usage of 50-70 kilowatt-hours per day. This translates to 175-245 watt-hours per square foot.
Sizing the Solar Panel Array
For a 2500 sq ft house with an average daily energy usage of 50-70 kilowatt-hours, a minimum solar panel wattage of 5-7 kilowatts is required. This assumes a peak sun hour rating of 5 hours per day and an efficiency of 20% for the solar panels. To be on the safe side, consider oversizing the solar panel array by 10-20% to account for variations in energy usage and solar panel efficiency.
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