Estimating electrical energy produced by a grid-connected photovoltaic (PV) system.

Energy Estimation Formula:

Annual PV System Performance= (sun hours) x (de-rating factor) x (system totals Watts-STC) x 365 days x Acorr

Where, Accor= azimuth correction from due south–therefore, Acorr=1.0 if azimuth of PV array is due south (180° or 0°).

Energy Estimate from PV Watts

Energy Estimate from PV Watts of 4kW system

PVWATTS calculates electrical energy produced by a grid-connected photovoltaic (PV) system. Researchers at the National Renewable Energy Laboratory developed PVWATTS to permit non-experts to quickly obtain performance estimates for grid-connected PV systems within the United States. To access this calculator, go to PVWATTS Version 2. Learn more about the PVWATTS calculator

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