08-28-2021, 07:24 PM | #11 | |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: Confirmation of SOC vs. Voltage Chart
Quote:
I thought it was unusual for the faster than expected charge. The SOC meter did count up but I didn't watch it continuously and I'm not sure where it was until I noticed the charger shut off at about 1.5 hours. At that time the SOC meter read 100 and the Ah read 72. Is it possible I was not at 100% when I reset the SOC meter and it is actually less? But then, the 42 Ah reading must have been high too if it is linear. I will check the open circuit voltage tomorrow. It is possible it is higher than it says. Tom |
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08-28-2021, 07:26 PM | #12 |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: Confirmation of SOC vs. Voltage Chart
That sounds like a plan....and is directly in line with what Pat said in another thread.
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08-29-2021, 07:52 PM | #13 | |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: Confirmation of SOC vs. Voltage Chart
Quote:
My charger is exactly 72.0 volts open circuit. But it keeps cycling on and off because there is a current sensor on the battery lead. I guess if it doesn't sense and current it shuts off. Long story short, I feel this ECO pack/ charger combination is doing the proper charge. It does shut off at less than 55 volts. I shouldn't need to worry about overcharging the pack. |
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08-31-2021, 05:43 AM | #14 |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,948
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Re: Confirmation of SOC vs. Voltage Chart
3.33v resting is ok and 22A accounts for the reduced charging time. It’s all good, and I’m glad you’re satisfied with the upgrade.
Cheers Pat. |
08-31-2021, 08:26 AM | #15 | |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: Confirmation of SOC vs. Voltage Chart
Quote:
Yesterday I used 16Ah during a ride. I started the charger and watched the SOC meter, amps, amp-hours and voltage periodically until it shut off. The charger ran for 1 hour and 5 minutes. The last one minute or so of charging the voltage started climbing rapidly to 57+, but it was so fast I couldn't detail the other readings and the decimal after 57 was too fast to read. The SOC and Ah were are 100 and 72 when the voltage started climbing fast from 54.65 until the charger shut off. Thanks for all your assistance. Have a great day! Tom |
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09-03-2021, 02:16 PM | #16 |
Getting Wild
Join Date: Jun 2020
Location: Charleston, SC
Posts: 110
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Re: Confirmation of SOC vs. Voltage Chart
I've spoken with the techs over at BigBattery regarding the voltage range at 100% SOC. Their BMS system allows for fluctuations as high as 58.8 and as low as 53.3 to be considered at "full charge." As you see in your chart, the amount of usable energy between 53.3 and 58.8v is less than 1% of the total capacity of the battery, so I can imagine that the batteries taking in juice from the charger at that point can lead to some rapid changes in voltage while the cells try to balance.
Based on what I've seen, the SOC at 100% typically settles at 53.3/4 within 30 minutes of coming off the charger, even if on the tender it surges to 58.8. I also see slight fluctuations in voltage based on the temperature in my garage. I assume that this has to do with the chemical reaction in the battery being more or less efficient at different temperatures. I was experiencing extremely inaccurate readings from the first battery meter I bought and swapped to one designed for this chemistry. So far it has proven to be significantly more accurate. On the advice of BB, I set "full" to 53.3v and "empty" to 45v. That said, I have operated the cart at voltages as low as 42v, but the results were...short lived. |
09-03-2021, 03:33 PM | #17 | |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: Confirmation of SOC vs. Voltage Chart
Quote:
I questioned ECO why it was 57 and not 58.4 and they explained there is little to be gained by going much over 53.33, which is 100% in practical use. I have set my minimum operating voltage, which is set in my mind not through the BMS, at 51.2 volts. This is 20% which other users and ECO have recommended not to go below. I charge my battery every day that I drive it more than a mile. As was explained by ECO, four 25% charges are the same as one 100% charge. 100% is one charge cycle and multiple charge cycles that add up to 100% is still one charge cycle. There is no reason to not charge it every time is is driven from this aspect of lithium life expectancy. If I just drive it around my yard however, I do not charge it that day. But I often drive 20 miles plus on a nice day and need it to be ready to do that. Tom |
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09-03-2021, 04:43 PM | #18 | |
Gone Wild
Join Date: Jan 2013
Posts: 275
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Re: Confirmation of SOC vs. Voltage Chart
Quote:
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09-03-2021, 04:58 PM | #19 | |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: Confirmation of SOC vs. Voltage Chart
Quote:
My ECO charger shuts off about 15 seconds after the Ah gauge hits 72 Ah or 100%. During that 15 seconds, the voltage rises quickly from 54+ to 57 volts which is output voltage of the charger. I have my time set to shut power off 1/2 hour after the partial charge cycle. I quess the ECO charger shuts down when the voltage to the battery equals the charger output and it shuts down. ECO told me I really don't need the timer, but it gives another safety from overcharging. |
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09-03-2021, 05:00 PM | #20 | |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,948
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Re: Confirmation of SOC vs. Voltage Chart
Quote:
Excellent post Tom! |
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