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Improved model of solar resource variability based on regional aggregation and climate zones

This paper provides the results of using an alternative method to calculate annual insolation probability of exceedance statistics (PXX), which are critical measurements for assessing long-term energy yield and valuation of PV systems. This method aggregates ground-based and satellite-based data, thereby increasing annual insolation data sample size and reducing the uncertainty in interannual variability.  Overall, the P99 annual insolation values were found to range from -4 to -8% of the P50 value across the continental United States.

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