All | Astronomy | BMS | Backpacking | Batteries | Bikes | Bolt_EUV | Camping | Channel Islands NP 2021 | EV_Charging | EVs | Ecomarathon | Home Network | SRJC Earth Day 2022 street mural | SRJCO | Solar | Sustainability | Teardrop | e-Bike | e-Golf | e-Mower | e-Stang | lunar eclipse 2022

e-Stang range history Posted on July 20, 2024 22:44:44.

Download PDF File

e-Stang range history Posted on July 20, 2024 22:44:31.

Download XLSX File

2024-05-24 e-Stang range test Posted on May 24, 2024 23:07:47.

2024-05-24 e-Stang range test

Since last test in April I replaced the broken regen enable switch and increased the max regen current from 30 amps to 50 amps. Not as good as our Bolt but one pedal driving is now more effective.

Got 30.3 miles until yellow light stuck on, 7.8 miles further than a month ago! Only 73 degree high today vs. 77 last month, but regen seemed to keep the batteries a little warmer, especially downhill. Regen alone probably doesn't explain the 35% improvement; I did more country road driving, 45 MPH with no stopping for several miles but hillier. Maybe the 16 year old batteries are intermittent?

2024-04-22 e-Stang range test Posted on April 23, 2024 23:26:29.

2024-04-22 e-Stang range test

Only 22.5 miles until red light came on! Regen switch still broken which should add a couple of miles back, but it's accelerating towards uselessness. See "e-Stang range test 2024-04-23.xlsx" for details.

e-Stang range test 2024-04-23 Posted on April 23, 2024 23:21:22.

Download XLSX File

2023-08-16 e-Stang range test Posted on April 23, 2024 21:10:50.

e-Stang battery capacity test
8/11-16/2023

25.7 miles driven; yellow light going on regularly but not stuck on so maybe another 1-2 miles before 2.3V cutoff; WAS REGEN SWITCH BROKEN YET?
61.4 Ah capacity
61% proportion of nameplate
59% proportion of new
14.6 years driven on this 2nd Valence pack (replaced under warranty after 2.4 years)
17.8 years estimated life to 50% of nameplate if linear decay
3.2 years left before 50% of nameplate
Nov '26 estimated replacement date at 50% nameplate
63.3 Ah discharged
1.8 Ah charged via regen
3% capacity extended by regen (but clutch switch is currently broken so limited to 12 amps instead of 50 reprogrammed up from 30 which showed 7% increase in range earlier - need to redo this, may be as high as 12% or 28 mile range)
8758 Wh net capacity
57% proportion of nameplate (worse than Ah due to increase in internal resistance)
9040 Wh discharged
2.84 miles per kWh, similar to Mach-e but far less peppy and less cargo

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...

e-Stang_BMS_2_2_2023 charging Posted on February 04, 2023 00:08:14.

Download XLSX File

2nd_module_3_pix Posted on August 29, 2021 22:45:57.

Open Directory

e-Stang charging Posted on May 08, 2021 22:56:04.

Download XLSX File