Tag Archives: March

March 2020 Solar Production and EV Efficiency

My solar monitoring platform was available for an entire month and all of the panels on my solar system were fully functional.  This led to a pretty good March for solar production:

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Just under 578 kWh for the month.  This compares with ~316 kWh in 2019 and ~424 kWh in 2018 or an increase of ~83% and ~36% over each of those years respectively.  My guess is that the average year-over-year production increase will fall somewhere in the middle of those two on average over the course of the next year.  Only time will tell.

For the month, my household ended up “net positive” ~67 kWh.  My household was also “net positive” in March.  It is my assumption that the next couple of months will be big “net positive” months in terms of electricity consumption versus production since the period before the hot summer months is generally light on consumption.

One factor driving a lower level of electricity consumption is the fact that we are not driving much, if at all, as a household due to COVID-19.  All of my children’s activities have been cancelled and we are working from home.  I cannot remember if I have charged my Nissan Leaf in the two weeks we have been home from an aborted spring ski trip to Colorado.

For the month, I drove my Nissan Leaf ~652 miles at an average efficiency of 5.3 miles per kWh.  Almost all of those miles were in the two weeks before we locked down at home.  I “saved” ~746 pounds of carbon dioxide emissions compared to driving my truck assuming that I pulled all of the electricity from the grid at my utility’s average carbon intensity.  In the first quarter I have “saved” ~2,785 ponds of carbon dioxide emissions.  Given that I am now producing more electricity via my solar panels than my household is consuming, including EV charging, those carbon dioxide savings are even greater.  The same logic goes for the fuel cost savings.

April is going to be a weird month for sure.

Spring has Sprung: March 2019 Solar Production and EV Stats

Can you tell the exact time when the snow finally melted in Iowa and it began to feel like spring?  I will give you one guess looking at the image below:

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It was like someone opened a door and spring rushed in looking for treats like a good boy.  I said it last year and I will say it again this year…I need to get a roof rake so that I can brush the snow off when it refuses to slide off my solar panels.  The way these things go it will probably be a very light snow year next season and the roof rake will sit in the garage unused for months.

It is my hope that April sees a production number on par with the prior year as the previous few months have really been mediocre in terms of solar production.  There is something ironic about getting an electric vehicle at the same time that my solar production fell off a cliff.  Oh well.

Speaking of the Nissan Leaf it also had a month when it became obvious that the weather had turned.  I drove 603.4 miles at an average efficiency of 5.0 miles per kWh.  This compares with average efficiencies of 3.6 and 3.9 miles per kWh in January and February respectively.

Two factors played into this efficiency increase: warmer weather that resulted in less use of the resistive heater and better knowledge of how to wring out mileage from the vehicle.  It is kind of amazing how you can optimize your driving along a route without resorting to any crazy hypermiling or vehicle modification. This is the kind of improvement that makes me wonder how much efficiency we can wring out of the transportation system without having to resort to draconian measures.

Over the course of the past two and a half months I have driven a total of 1583.6 miles in my Nissan Leaf.  That has saved 1731.9 pound of CO2 versus my prior vehicle and cost a total of $49.34.  The emissions and cost numbers are based on me using grid electricity for the entirety.

As an aside, I utilized a public charger for the first time this month.  In practical terms it was super easy.  I pulled up to one of the two spots at my place of work, tapped my Chargepoint RFID keycard, and got to charging.  There has been a lot of talk about infrastructure for charging and how it impacts the widespread adoption of EVs.  In my experience, the publicly available charging infrastructure is not the major hurdle to adoption for a lot of people.  Unlike urban areas, the suburban area that I live in is rife with attached garages where people can charge their vehicle at home overnight.  Within line of sight of my garage are two houses with Tesla Model 3s and in conversations with the owners I have found that they also rarely, if ever, utilize public chargers, including Tesla’s vaunted Supercharger.  It is just not necessary for the majority of driving that takes place in an average day.  Heck, I only used the charger at work to ensure that my Chargepoint card worked so that I could take my Leaf down to Iowa City in the summer.

Back in Black…Electricity Wise

A good month or so of solar photovoltaic production and a nine day vacation put me back in the black in terms of energy production and consumption:

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Eighty two kilowatt hours of clean, green solar electricity production above my household consumption to be specific.

As you notice from the image above my bill is not zero or even net positive.  Why?  The dreaded facility charge or connection fee.  What is this?  It is the fee charged by your electricity provider for the use of the grid regardless of your electricity consumption or, in my case, production.

Now, the grid essentially acts as my battery since I have a purely grid-tied solar system.  It does not seem like a heavy burden to bear per month for the security of having electricity on demand.  However, in some states—here’s looking at you Arizona—legislators, hand in hand with their energy company lobbyists, are pursuing fees for connecting solar systems and higher facility charges in general to supposedly offset the costs incurred by these systems being active.  Some states have proposed that solar system owners pay an extra per kilowatt hour fee for each kilowatt hour that they draw from the grid.

This all seems fine and dandy to the people running electric utilities, but it may end up creating the conditions for a death spiral.  As costs for battery storage decrease and solar systems proliferate households may choose to sever their connection to the grid entirely.  In high cost or low reliability locations this is already happening.  As increasing numbers of households leave the grid the existing infrastructure is supported by fewer rate payers increasing the individual household’s share of the costs.  Costs go up and the incentive to sever ties to the grid increases thus more households make the leap.

None of this will occur overnight, so to speak, but the conditions are becoming increasingly favorable for such a transition to take place.

 

March Brought Over 400 kWh of Solar Electricity

For the month of March my solar photovoltaic system produced just a hair over 424 kWh of electricity, which stands as my second best full month since my system went active in the last week of August 2017.  A few things stand out from the month:

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Notice the two major dips in production?  That is the impact of some spring snowfall that covered my panels under at least six inches of heavy, wet snow.  It just goes to show the potential value of a snow rake in upping my production next winter.

The other thing that is interesting, but is not something readily apparent in the production chart, is that the month was just generally more productive each day.  Granted, the days are longer in March.  However, I think that there is something to be said for the intensity of the solar radiation being higher as we head into spring.  The winter months in Iowa are known for being heavily cloud covered and this reduces the overall productivity of the solar system.

The last week, as the sun stays bright until after 7:00 PM, I have noticed that the system is producing well in excess of 3 kWh into the late afternoon/early evening.  This bodes well for the coming summer months when the array will be getting hit with the sun fairly heavily from noon until sunset.