Long Descents

CaliforniaBear · Sep 27, 2014

roflwaffle said: ↑

CaliforniaBear said: ↑

We need to start this discussion all over again!

1) We can drive the car every morning at 60 mph for 12 miles or a full discharge (85% to 20% SOC) in 12 minutes. Toyota does not suggest this would be a bad idea, they designed the car to do exactly that. While rapid discharge isn't as hard on the battery as rapid charge we can certainly do a full charge in 20 or 30 minutes on those occasions we find a hill/mountain road that would provide that rate/total regeneration.

2) The discussion about 1C, 2C or more C means absolutely nothing unless you know the configuration of the battery. "C" has to do with cells not whole batteries. If you have 10 cells in series a 2C charge rate (based on cell amp-hours) might be a good rate for actual full charge (near 0% SOC to near 100% SOC). For a 20% to 85% SOC a higher rate might be okay. If the 10 cells are in parallel the charge rate can be 20C for the same stress on the cells. The Prius battery is a battery not a single series of cells.

Conclusion: Whatever regeneration charging rate and duration the car computer will allow for whatever hill you go down at whatever speed is okay. The battery will probably still last 10 years or 150,000 miles.
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The C-rate can apply to an entire pack assuming a pack with a specific capacity and a specific amount of power used for charging. If you talk about it in terms of energy/power, pack configuration doesn't matter.

Lets say you have 5 2V 1ah cells in series in a 10V/10Wh battery. If you charge at 1A/10V (10W) for 1 hour that's a 1C rate. If you have 5 2V 1ah cells in parallel in a 2V/1oWh battery and charge at 5A/2V (10W again) for an hour that's still a 1C rate even though the battery has a different configuration. Either way the c-rate is the same as long as the charging power and energy capacity remain the same.

http://web.mit.edu/evt/summary_battery_specifications.pdf
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Yes, my later post above agrees and goes through the calculation. Use all the regeneration available it makes for very good mpg.

Long Descents

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Long Descents

CaliforniaBear Clearwater Blue Metallic