Tag Archives: Leaf

Third Quarter New Year’s Resolutions Progress

It is now October and that means it is fall.  It also means that I am nine months of the way through the year which is probably a good time to check in on where I am at with my resolutions or goals for 2019.  Here goes:

  • Decarbonize transportation—My 2015 Nissan Leaf has been in the garage for almost nine months. Through the end of September 2019 I have driven ~5,893 miles.  By trading a Ford F150 for a Nissan Leaf I have saved ~6,733 pounds of carbon dioxide from being emitted.
  • No more Amazon—While I failed in the first quarter and succeeded in the second quarter, the third quarter was a little better. I spent some money that I was “awarded” from work via a gift card.  It was money spent at Amazon, but it was not my cash and I felt that the effort to transfer the funds was not worth the return.  Trying to reduce my spending at both Amazon and Walmart has made me think about our consumer habits in general.  More to come.
  • No more Walmart—Spent about a $100 on school supplies for a work organized effort to help out area kids during the back to school time. Walmart was running sales where I was able to pick up whole classrooms’ worth of some supplies for a few dollars.  It was craziness and well worth failing in my goal to make it happen.
  • Read twenty five books—38 books read in the first nine months.  Mission accomplished.
  • Drink local—Doing pretty good so far.
  • Declutter my house—This is probably the singular failure so far this year. Sure, some stuff has gone to Goodwill but I feel that on the whole nothing is less cluttered than it was nine months ago.  Maybe I can sprint to the finish.
  • Replace existing toilets with low volume flush models—I have picked out the model of toilet to replace my existing commodes. I have even purchased the wax rings to install the new toilers.  Now I just need to get a free day on a weekend to spend a few hours doing some plumbing.  Can you tell that this is my favorite way to spend a few hours on a Saturday?
  • Plant at least five trees—Two Norway spruce trees are in the ground. Three Colorado blue spruce trees in the ground.  Mission accomplished.
  • Reduce lawn coverage— No real progress, but I have plans. I promise!
  • Ride 2,500 miles on gravel roads—I am sitting at ~2,718 miles for the season as the month of September came to a close. Surprisingly, September was a real dog of a month for riding as the weather really conspired to keep me inside.   Mission accomplished.

So far, so good I think.

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September 2019 Solar PV and EV Numbers

The past month was surprisingly similar to the same month the year prior:

Sept 2019 solar

Almost 416 kWh of clean, green electricity from the funky yellow sun.  All in, including 100% of my EV charging needs, I ended up down ~122 kWh for the month.  The weather was schizophrenic this month bouncing from cool fall weather to hot and humid.  The third week of the month felt like the dog days of August with 90 degree temperature readings and similar humidity levels.  Needless to say, the air conditioning got turned on to cut that down a little bit.  Until that point I was running ahead in terms of production versus consumption.

For the month I drove my Nissan Leaf EV 755.1 miles with an average efficiency of 5.9 miles per kWh.  For the month I required ~128 kWh of electricity for my mobility.  Compared with the F150 that the Leaf replaced, I avoided emitting ~879 pounds of CO2 into the atmosphere assuming that I drew electricity from the grid at an average carbon intensity for my region.

For the first nine months or so of the year—my Leaf arrived the second week of January—I have driven a total of 5,893 electric miles at an average efficiency of 5.2 miles per kWh.  The total C02 emissions that have been avoided versus the F150 that the Leaf replaced are 6,733 pounds thus far.  Again, this assumes 100% of charging occurs from the grid with an average carbon intensity for the region.

Interestingly, the total amount to charge my Nissan Leaf for the month–~128 kWh—was about how much I was “down” for the month in terms of solar production.  This aligns with my original estimates where my initial sixteen panel PV array would provide ~100% of my electricity needs.

As the weather turns cool and the pumpkin spice flows freely I am waiting on an install date for the solar array expansion.  The plan is to add 8 360 watt panels to my existing 16 290 watt panel array.  This represents a ~59% increase in solar capacity and given the new panels will be on the same azimuth it should represent the same amount of increase in terms of actual production.

The increase in solar array capacity should account for more than 100% of my Leaf’s charging needs and provide a cushion of excess production for additional electrification.  The future is electric.

A Great Month for Solar Production, Electricity Consumption, and EV Efficiency

At last!  In August 2019 my solar photovoltaic array produced more than the same month in prior years.  I was somewhat consigned to a reality where my best days of solar production were behind me, but August came to the rescue:

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All in, my household ended up 179 kWh “up” in terms of electricity production minus consumption.  Remember, this includes all of my EV miles as well.  For the year I am creeping back toward being even in terms of production minus consumption after some awful months in the dead of winter.  During that period of time my solar array was covered in nearly a foot of wind driven snow and our electricity usage was high due to crazy low temperatures.  Normally August is a heavy month for air conditioning use.  Our HVAC system has been idle since the first week of month.

For the month of August my total miles driven in the Nissan Leaf was depressed by not being home for a little more than a week.  In the end I drove 531.2 miles at an average efficiency of 6 miles per kWh.  Compared to my truck and assuming power is drawn from the electricity grid, I saved ~620 pounds of carbon dioxide from entering the atmosphere.

Since bringing the Nissan Leaf home I have driven a total of 5,138 miles and save 5,854 pounds of carbon dioxide from being released.  Using the most conservative method of calculating savings—which assumes all electricity comes from the grid as opposed to my solar panels—I have saved just under $727 in fuel costs alone.

Knocking it Out of the Park with EV Efficiency…Solar Not So Much

There are times when driving my second hand Nissan Leaf feels like I am working on cracking a code.  Change one behavior (e.g. turning on the heat) and relative efficiency takes a nose dive.  Adjust a few things (e.g. make sure to drive with the car set in “B” mode) and it seems like you can do no wrong.  Ambient air temperature, type of driving, route choice…on and on it goes.

I am certain that it is the same for a traditional ICE vehicle or even a Tesla, but when you are limited to a little more than 100 miles on a full charge there is a hyper heightened awareness to how quickly the “guess o’ meter” depletes.  However, it was a lot less of a concern this month as I averaged 6.1 miles per kWh for just a tenth of a mile over 900 miles.  That works out to a little less than 148 kWh of electricity consumed and ~1,053 pounds of carbon dioxide emissions avoided versus driving my truck.

Since January I have driven 4,607 EV miles at an average efficiency of 5.1 miles per kWh.  This correlates to ~5,234 pounds of carbon dioxide emissions avoided versus driving my truck.  As I have said before this assumes that I draw all of my power from the grid as opposed to generating it on site with my solar panels.  Based on gasoline prices I have saved about $650 just in fuel since January.

Speaking of solar photovoltaic production, July was a fairly good month:

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720 kWh for the month is good.  It is a little bit less than the same month during the prior year, but I would say that it is within the margin of error.  It is not like this is January and February where snow covered my panels up to a foot deep some times.

All in my household consumption ended up about 26 kWh more than my production.  Included in my household consumption numbers are almost all of my EV charging, so without the Nissan Leaf in the garage we would have ended up over 100 kWh.  Granted, that would mean I was spewing carbon dioxide from the tailpipe of my truck.  I will take the trade.

Unlike some summer months we were home for every weekend and took no trips.  Furthermore, for the entire month of July we went out to eat once.  I feel fairly good about making all but one meal at home, charging my electric car, running the air conditioning when it got really hot, and still managing to almost be even in terms of household electricity consumption versus solar electricity production.  It is my hope that in the next month I will adding about 60% more solar photovoltaic capacity to my roof.

Second Quarter New Year’s Resolutions Progress

June has come and gone.  Summer is officially here.

It also means that it is a good time to check in on where I am at with my resolutions or goals for 2019.  Here goes:

  • Decarbonize transportation—My 2015 Nissan Leaf has been in the garage for almost six months. Through the end of June 2019 I have driven ~3,706 miles.  By trading a Ford F150 for a Nissan Leaf I have saved ~4,181 pounds of carbon dioxide from being emitted.
  • No more Amazon—While I failed in the first quarter, I feel like I am nailing it in the second quarter with $0—yes, zero—spend at Amazon in the past three months. It is surprisingly hard to resist the temptation to just order something from Amazon at nine in the evening.  It is like our brains are wired to just hit the “add to cart” button.
  • No more Walmart—As with my goal of spending no money at Amazon met with reality in the first quarter but improved in the second quarter, so too did my attempt at not patronizing Walmart. Zero dollars in the second quarter.
  • Read twenty five books—23 down, 2 to go.
  • Drink local—Doing pretty good so far.
  • Declutter my house—I started off with the best intentions in January, but after taking an entire car load of clothes the effort to get stuff out of the house has kind of fizzled. Again, I feel a little overwhelmed by all of the stuff that we have in the house.
  • Replace existing toilets with low volume flush models—I have picked out the model of toilet to replace my existing commodes. Now I just need to get a free day on a weekend to spend a few hours doing some plumbing.  Can you tell that this is my favorite way to spend a few hours on a Saturday?
  • Plant at least five trees—Two Norway spruce trees are in the ground. I am actively hunting for additional trees to plant, but the nursery stock locally has not been very attractive.
  • Reduce lawn coverage— Plans are laid out and some of the hardscaping materials are sitting in my driveway. However, this is the kind project that has to wait until the temperature declines a little bit.  Spending a day digging out turf when the mercury is over 90 degrees and the humidity level is above 90 percent is a no go.
  • Ride 2,500 miles on gravel roads—Almost 1,200 miles have been spent in the saddle so far and this includes a lost week spent on vacation in Colorado. I had the best of intentions to ride while I was out in Summit County, but I chose to hike and raft instead.

So far, so good I think.

May Showers Dominate Solar Production and Electric Vehicle Efficiency is Stable

May was a rainy month in eastern Iowa.  How rainy?  It rained for twice the number of hours in May and three times the usual rainfall hit the ground.  Things were really wet.  Like the “ground is a sopping wet sponge” wet.  It had an impact on May’s solar production:

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Now, just over 542 kWh of clean, green solar electricity is not bad.  It is down about 80 kWh from the same month the prior year.

All in all, my household ended up about 10 kWh ahead of consumption for the month of May including home charging of the Nissan Leaf.  When you can drive all month and live in house with modern amenities all powered by the sun that is considered a win.  Sometimes I just feel like I am living in the future.

For the month I drove 937.4 miles in my Nissan Leaf at an average efficiency of 5.5 miles per kilowatt hour.  This beats my efficiency the prior month by 0.1 miles per kilowatt hour.  This saved ~1,080 pounds of carbon dioxide emissions versus my prior vehicle assuming that I charged using grid electricity, which in Iowa averages about 1 pound of CO2 per kWh.  As noted above, I actually ended the month ahead of my consumption so the emission savings were probably higher.

It does not seem like a big win in terms of efficiency.  However, there are two round trips to Iowa City that totaled almost 140 miles of driving at highway speeds.  For anyone who has driven a Nissan Leaf there is a moment of dread the first time that you get the little car up to 60 miles per hour or more and watch your efficiency drop like a stone in freefall.

The trick is to minimize interstate highway type driving in favor of more sedate state or county highway driving.  That is to say, drive 55 miles per hour as opposed to the 70 miles per hour or more on the interstate.  It takes a little longer, sure, but there is something really peaceful cruising along with the windows down and the silence of an electric vehicle drivetrain.

It also helps to have access to public charging at the midpoint of your trip.  In Iowa City there are ChargePoint facilities available in several public parking ramps.  You pay for parking (first hour is free and a $1 per hour for any additional time) and the charging is free as long as you have a ChargePoint account.  My Leaf is equipped with a standard Level 2 charging port so it can accept, at most, 3.3 kWh of electricity per hour of charge.  It is not a lot for the ninety minutes or so that my errands in Iowa City take, but it provides a margin of safety for the trip home that eases any potential range anxiety.

These trips have gotten me thinking about electric vehicles and range.  Maybe the issue is not absolute range, as in 235 miles of range when fully charged, but rather the ability to gain a lot of range in a short period of time, as in 80% battery charge in 30 minutes.  If I was able to regain more than three quarters of my vehicle’s charge in less time than it takes to make a quick trip into Costco that would change my route calculations considerably.  Also, if more public charging facilities were available at destinations that might also change behavior.

Do I spend a little more time in downtown Iowa City because I am charging my Nissan Leaf?  Probably.  Think about that from an economic development standpoint.

Cracking the Electric Vehicle and Solar Photovoltaic Code in April

April felt like the month where I cracked the code on this whole electric vehicle thing.  How so?  After averaging 5.0 miles per kilowatt hour (kWh) in March and considerable less in the prior two months I ended April at an average of 5.4 miles per kWh.  Over the course of ~630 miles of driving I saved ~724 pounds of carbon dioxide emissions compared with my prior ICE vehicle.

Since mid-January when I acquired my used Nissan Leaf, I have driven a total of ~2,214 miles and saved ~2,456 pounds of carbon dioxide.  Not to mention saving ~$230 in fuel costs, which is a number that is sure to go up as fuel costs are creeping up here in eastern Iowa along with the spring time temperatures.

The story gets even better when you factor in April’s solar production:

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The numbers are not dramatic in and of themselves.  However, for the month—including the electricity that I used to “fuel” my EV—I produced ~95 kWh in excess of my needs.  For the month of April my house and my car were more than fueled by the sun.  That is the future.

Imagine what things will be like when I increase the generating capacity of my solar array by almost 60%.  Based on my calculations that will allow for more than 15,000 miles of electric driving per year which should cover both my and my wife’s commuting miles in town.