My 4.4kW system:
September 2017: 360kWh
September 2016: 433kWh
September 2015: 422kWh
September 2014: 446kWh
September 2013: 452kWh
September 2017, Hurricane Irma came through, and the PV system was disengaged from the grid for 6 days, to give the grid time to re-stabilize. (we were only without grid power for ~60 hours, but fluctuations in the grid continued for days as more customers were re-energized). Even after the storm, it was a rather rainy month.
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