09-18-2021, 10:55 AM | #31 | |
Gone Wild
Join Date: Apr 2017
Location: SE TN
Posts: 2,226
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Re: Confirmation of SOC vs. Voltage Chart
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09-18-2021, 06:02 PM | #32 |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,943
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Re: Confirmation of SOC vs. Voltage Chart
Hi Walter,
We don’t know what the cell cut off voltage has been set to in the HSKY. It may be much lower than 3.75v. I know when I manufacture a LiFePO4 pack I set the max protection voltage to 3.65v/cell and set the charger to 3.55v/cell. You will get less than 1% SOC increase by charging above 3.55v anyhow. Cheers Pat. |
09-18-2021, 07:27 PM | #33 |
Gone Wild
Join Date: Apr 2017
Location: SE TN
Posts: 2,226
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Re: Confirmation of SOC vs. Voltage Chart
Well I don't know what's the best setting but I always tend to follow the manufacturers recommendations. That said you still see a lot of battery recalls like the recent LG recall so maybe they don't know either. At this point we are all learning.
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09-19-2021, 02:59 AM | #34 |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,943
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Re: Confirmation of SOC vs. Voltage Chart
Absolute maximums are well documented, when you see a battery recall it’s most likely due to incorrect implementation of, or faulty operation of the BMS. Cells can fail, but it’s usually the BMS, either failing itself or causing failures in the cells.
Cheers Pat. |
09-19-2021, 08:22 AM | #35 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,171
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Re: Confirmation of SOC vs. Voltage Chart
LG recall was due to a defect in the cells themselves.
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10-27-2021, 11:13 AM | #36 |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: Confirmation of SOC vs. Voltage Chart
A followup: I normally don't do this as I charge after any 5 or more mile run. But I decided to see just how far I could dependably push it.
I made three runs of 14.12, 15.86 and 8.31 miles in three consecutive days. This totals to 38.29 miles. The ending SOC was 13.9. My earlier calculations of a 1.46Ah per mile were accurate the first day only. The second day it was 1.59Ah per mile. The third day it was 1.79Ah per mile. Thus confirms my choice of charging after every longer run. I need to be ready for whatever comes my way! And also confirms a 35 mile range to 20% SOC, exactly what E.B. told me it would be. |
10-27-2021, 04:09 PM | #37 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,171
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Re: Confirmation of SOC vs. Voltage Chart
That is great range!
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10-27-2021, 05:53 PM | #38 |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: Confirmation of SOC vs. Voltage Chart
Yes, I'm very pleased with it!
With my earlier logs of 1.42 to 1.46Ah per mile, with a 27 mile run of 1.42Ah and a 21 mile run of 1.43Ah per mile, I thought I would be easily over 40 miles range. These were done in one continuous ride. I now see the Ah "fuel gauge" is not linear and starts to drop off after 40 SOC or so. But I feel comfortable with 35 mile range. I just finished an 8 mile run with 260 pounds of 11 and 12 year old grandsons on the back seat. My usage was 1.97Ah per mile with the added weight! The power was there just like when it was just the two of us. But the battery drain was much greater. We would get less than 25 miles to 20% SOC at that rate. Actually, 8 miles keeping them interested was plenty! You know, "are we there yet?". |
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