June 2019 Solar was Back on Track and EV Miles were Extra Efficient

June was a better month for solar production:

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Over the course of the entire month my household ended up ~150 kWh (consumption minus production), including all of my EV charging for that same period as I did not use any public chargers.  With at least eight more panels being installed on my roof this summer I am going to be seeing a lot more months with excess production.  Every kilowatt hour that I produce from my solar array is like a nail in the coffin for coal.

The excess production in June was a little artificial because we were on the road for more than a week.  With no air conditioning running it is to be expected that we would run a surplus.  June was also fairly cool with a corresponding lack of need to deploy air conditioning.  The last few days of the month were a reminder that summer in Iowa is a hot and sticky affair.  I am talking temperatures exceeding 90 degrees and humidity levels exceeding 90%.  If there was ever a time where I did not want to come home from the mountains this was that time.

For June I drove my Nissan Leaf a total of ~555 miles at an average efficiency of 5.9 miles per kWh.  This is my best number by far, in terms of efficiency, and makes me wonder if I can nurse my way to a figure over 6 miles per kWh in July.  For the period I saved ~646 pounds of C02 being emitted assuming that my charging came via the grid at an average carbon intensity.

You may ask how I can be ahead in terms of energy production yet still account for some level of carbon intensity for my electric vehicle.  Unfortunately, my photovoltaic array’s production occurs when I am not charging my EV which usually happens at night.  Therefore, to run my Nissan Leaf I am utilizing grid electricity.  It’s a little like keeping two sets of books for the same business.

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