astronomical events Posted on September 30, 2023 21:58:49.
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e-Stang Cost of Ownership Estimate 20230923 Posted on September 23, 2023 15:32:43.
e-Stang Cost of Ownership Estimate
9/23/2023
Only comparing prototype battery amortization and charging costs spent to gasoline cost saved.
Calculations:
- Duration driving electric: July 2006 through September 2023, 17.2 years
- Car has been driven 55,759 miles electric, 3,242 miles per year, 8.9 miles per day
- Batteries cost $17,000 and were replaced under warranty in 2008 after some cells dropped below 80% capacity; cells are now ~60% capacity after 15 years
- Car gets ~2.8 mi/kWh DC and the charger is at least 90% efficient, so AC efficiency is about 2.52 mi/kWh
- Car has used about 22.127 MWh, about 48% of what our 1.8 kW solar array would have produced during that time had its performance not degraded down to ~40% of initial capacity over the past several years, either due to the inverter or wiring, probably not panels
- Assuming $.20/kWh it has cost about $4,425 to charge my car. That number is high since I have gotten many free charges at work, and early on at public chargers when there were incentives.
- Total cost of charging my car plus the cost of the batteries if they were worth $0 today is $21,425, or $.384 per mile.
- I used to get 21 MPG average, so I avoided using about 2,655 gallons of gas. Assuming the average cost of gas has been $4, I would have spent about $10,621 or about $.190 per mile.
- I have spent $10,804 more to drive electric than gas, $.193 more per mile. Gas prices would have had to been over $8 for me to break even.
- I expect to use these batteries until about 50% capacity or about 3 more years to a total of 20 years, so the charging cost at that point would be about $5,415, and including the batteries would be $22,145, $.397 per mile. Gas use avoided would be about $12,350. Gas would have still needed to average $8.34 to break even.
Conclusion:
- My next pack will probably be mass produced batteries that will probably cost less, and gas prices will probably be more, so I might break even on my next pack.
- The cost and value of reducing greenhouse gases is hard to calculate but very important and not included in this analysis.
- A smaller, lighter and more efficient vehicle would reduce overall cost and impact, like The Teardrop...
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