Solar-charged driving and most solar-charged drivers have a dirty little secret: Coal.
Okay, it really isnāt that much of a secret.
A home solar system produces electricity during the day. Most electric car owners plug in their EVs at night. If you plug in at night, youāre not using solar electricity to power your EV. The electricity flowing into your EVās batteries is being produced by whatever the night-time grid mix is where you live.
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So, basically, in most solar-charged driving cases, at best, youāre using so-called solar-offset electricity, meaning your home solar system generates extra electricity during the day, for which you get credit, and you tap into that credit at night when you plug in a car.
Donāt get me wrong: Tapping the solar-offset electricity ābankā to power an EV is a great thing, especially economically.
While waiting, seemingly endlessly, for production EVs to arrive in Colorado, we’ve generated about 4,200 kWh of banked solar-offset electricity, or the equivalent of more than $2,000 worth of āgasolineā (25 mpg, $3.50 per gallon, 3.5 miles/kWh).
Sticking it to Big Oil
Thatās extremely satisfying from an independence standpoint and from a stick-it-to-Big-Oil standpoint, with the latter benefit a huge one for me ā I truly detest Big Oil.
However, running an EV on solar-offset electricity is considerably less satisfying from an environmental standpoint.
Yes, the 4,200 extra kWh weāve pumped into our neighborhood grid, and the possibly 10,000 extra kWh we will have pushed into that same grid by the time production EVs arrive ā finally! ā in Colorado, have definitely cleaned up the grid locally, during the day, that is.
Our solar-generated kWh mean that a neighborās air conditioner, dryer, electric range, etc. is often partially solar-powered — although I bet none of my neighbors know this, or even give any thought to it, actually.
But even though the thousands of solar-offset kWh weāve banked will save us a lot of money and even though they are helping to clean up the local grid during the day, they won’t be powering our EV.
If we plug in at night ā and thereās really no other way for us to access our banked solar-offset kWh ā here in Xcel Energy territory on Coloradoās Front Range, our EVās batteries will be filled with electricity generated primarily by a mix of coal and natural gas. Thatās not a good feeling for me.
Plugging in at night
If we plug in at night ā and thereās really no other way for us to access our banked solar-offset kWh ā here in Xcel Energy territory on Coloradoās Front Range, our EVās batteries will be filled with electricity generated by a mix of coal and natural gas.
Thatās not a good feeling for me. I donāt like the fact that coal will be the primary ādirectā fuel for our future EV.
And, even though every single mile we eventually drive in our new EV will be, at the very least, a solar-offset mile, even though our 5.59 kW home solar system has pumped out thousands of extra kWh in its first 11 months, even though that same system will cover 100 percent of our electricity use with one EV, and, with the thousands of kWh weāve banked, will actually be enough to power 100 percent of our home electric use plus two EVs for several years when you take into account all of our solar-offset electricity, in the end, we still will have not managed to escape the trap of Dirty Coal.
Thousands of kWh of sun electricity
Is what weāre doing better than plugging in without having added thousands of extra kWh of daytime sun electricity to our local grid?
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Absolutely!
Frankly, though, just how much good itās actually doing, I canāt really say ā because Iām too mathematically challenged to figure out, and then crunch, the many different numbers in play in a solar-offset-charged scenario such as our own.
But even if I could figure it all out for our specific solar-offset-charged situation, weād still be left with the (not-so?) dirty secret of all grid-tied solar households: Whether youāre talking about solar-charging a car or solar-powering a refrigerator, if youāre doing so at night, through solar-offset, unless youāre lucky and live in an area with high-levels of hydro and/or wind power, youāre likely to be still very much reliant on, yes, Dirty Coal — and you will be until our society finally invests in, and plugs into, the holy grail of clean, renewable energy: Energy storage.
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