How much, if any, should I adjust the “Local Micro-Climate/Temperature Adjustment Factor” input?
This input is used to make adjustments to system performance to cover a number of factors, such as microclimate variations or changes in module operating temperature due to mounting factors. Adjusting for local microclimate should be done very conservatively. For example, many people consider San Francisco, CA to be very cloudy, but in fact, it gets only 3.6% less sun than Los Angeles or Boulder, CO. Phoenix, AZ is often thought of as extremely sunny, but it gets only 20% more sunlight than San Francisco. Typically, microclimate adjustments for variations for locations should be less than 3% and would be entered as a relative percentage to the reference location. If the desired location gets 3% less sun, you would enter 97% into the input. Adjusting for module temperature due to module mounting factors can be a much more significant change. Modules lose performance when they heat up and the way they are mounted on a roof can block airflow, causing thermal stagnation. Anything less than
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