December 2021 Solar PV Production and EV Efficiency

December 2021 solar photovoltaic production was up versus the same month last year.  About 43 kWh of additional production is good, especially in a generally garbage month for production.  How did the month look:

A total of ~273 kWh produced for the month.  In terms of electricity production versus consumption my household ended up “in the red” ~256 kWh. 

For the year, my household is ~459 kWh “in the black” or net-positive in terms of electricity production versus consumption.  The prior year we ended “in the black” ~1,040 kWh.  A part of this attributable to not working from home for the first quarter of 2020 and then following that up with a severe downturn in miles drive—a direct proxy for electricity usage in my household due to the Nissan Leaf.  Additionally, we are making an effort to use electricity to heat small spaces this year rather than relying on our natural gas fired furnace.  For the same billing periods in November and December our natural gas usage was down ~41% and ~18% respectively with similar average temperatures.

For the month of December we drove the Nissan Leaf 438.1 miles at an average efficiency of 5.1 miles per kWh.  This works out to a CO2 avoidance of ~498 pounds versus my truck assuming we pulled every watt for the Nissan Leaf from the grid at an average carbon intensity for my region. 

For the year, so far, we have driven ~6,307 miles at an average efficiency of ~5.3 miles per kWh.  This translates into a CO2 avoidance of ~7,210 pounds versus my truck assuming we pulled every watt for the Nissan Leaf from the grid at an average carbon intensity for my region. 

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