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Old 09-12-2020, 12:17 AM   #11
NCPW
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Default Re: nissan leaf amp hours and watt hours?

You have to factor in age and condition. Those cells came with 66 ah straight off the assembly line. No way they have anywhere near that capacity left in them now.
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Old 09-12-2020, 07:10 AM   #12
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Default Re: nissan leaf amp hours and watt hours?

Quote:
Originally Posted by MyCousinVinnie View Post
Understood, but if I change the cell maximum to 4.05 and the cell min. to 3.2, doesn't that change my state of charge, assuming they stay fairly balanced? Or does it not? If it does, I'm going to cut off well above 3.2. Also, still need to figure out which figures to use for amp hours and watt hours.

I've looked back at the original specs of a Nissan Leaf battery, first generation. It had a max of 4.2volts per cell. Min of 2.5. Nominal voltage was 3.75. Amp hours 66. So, the math is

I have 14s2p so the math is 3.75v times 66aH x 14 cells x 2 parallel = 6930.

Should I just use that?
Sure. Use that number.

But again, I think your being overly concerned about the SOC measuring when you can simply look at your voltage. SOC is a measurement of how much "juice" you have left in your pack. But so is voltage. SOC is a math formula with some "best guess" numbers used to make the SOC meter as accurate as it can be.

But volts are volts and I don't need any best guess numbers to know what the volts are.

I look at the volt meter. That's the important number for me.

FWIW
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