11-24-2022, 12:19 PM | #11 |
Gone Wild
Join Date: Apr 2008
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Re: Allied Lifepo 48v charger status LED remains green
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11-24-2022, 01:51 PM | #12 |
Not Yet Wild
Join Date: Jul 2013
Posts: 37
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Re: Allied Lifepo 48v charger status LED remains green
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11-24-2022, 03:06 PM | #13 |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,919
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Re: Allied Lifepo 48v charger status LED remains green
With LiFePO4, you can’t tell state of charge by voltage. 12.98v could be anywhere from 30% to 80% depending on charge voltage.
A bit more info please bevelsport. Does the charger even try to charge? That is, does it start charging then quickly turn green or doesn’t it even try to charge? The 12.98v you state, is that without the charger connected? If it is, what is the voltage on each battery with the charger connected and showing a green LED. |
11-24-2022, 04:06 PM | #14 | |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: Allied Lifepo 48v charger status LED remains green
Quote:
Took the words out of my mouth |
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11-24-2022, 05:35 PM | #15 | |
Gone Wild
Join Date: Apr 2008
Posts: 2,226
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Re: Allied Lifepo 48v charger status LED remains green
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11-24-2022, 10:23 PM | #16 | |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,919
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Re: Allied Lifepo 48v charger status LED remains green
Quote:
LiFePo4 cells are not 4.2v. They are 3.2v nominal with an absolute maximum charge voltage of 3.65. You can fully charge (well above 99% anyhow) a LiFePO4 cell with as little as 3.45v. The cells with then settle to about 3.35v. LiFePO4 has a very flat discharge curve and depending on the cell, 3.245v (12.98/4) can be anywhere from 30% to 80% SOC. Cheers Pat. |
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11-24-2022, 10:44 PM | #17 | |
Gone Wild
Join Date: Apr 2008
Posts: 2,226
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Re: Allied Lifepo 48v charger status LED remains green
Quote:
I agree that 3.65v is the max you should safely charge a lifepo4 cell I've read they are technically 4.2v cell as nmc are generally 4.7 V here's an article I just found with a quick Google search. https://www.evworks.com.au/page/tech...-lithium-batt/ I've also read that charging above 3.65 can damage the cells and degrade battery life. It's interesting that the OP / owner of these batteries agreed that the batteries were at about 30% charge.. perhaps he has some sort of battery meter that reinforces this belief? |
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11-25-2022, 12:18 AM | #18 |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,919
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Re: Allied Lifepo 48v charger status LED remains green
You will be OVERCHARGING a LiFePO4 cell if you charge them to 4.2v. Because LiFePO4 is forgiving, it can be "safely?" charged to 4.2v. It is still overcharging and the standard consensus is to not charge beyond 3.65v. The data that is published about cell life etc. is all based upon a maximum charge voltage of 3.65v, anything beyond this will quickly reduce service life.
Please don't derail this thread as we're trying to help bevelsport with his problem. My point about the variation in SOC was to imply that even though the batteries are the same voltage, they may still be out of balance. Allied 12v series connected batteries are notorious for this. Many members here will attest to that. Hopefully bevelsport will come back with more information. |
11-25-2022, 01:38 AM | #19 | |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: Allied Lifepo 48v charger status LED remains green
Quote:
And beyond that, we’re still assuming 30% measuring by voltage. It’s also well known due to the extremely flat discharge curve of lifepo4 that you can NOT estimate SOC based on voltage alone. A shunt style meter counting electrons flowing out of, and back into the battery is necessary for an accurate measurement. So back to OP more information on exactly what is happening please. Trying to determine if the charger is acting up, the batteries are out of balance, or maybe whatever voltage reading you see isn’t really 30% but the charger is working as it should and the pack is actually fully charged… I’d also ask how the pack behaved before all of this happened, to have a basis of comparison or is this a cart you’ve recently purchased with this set up. |
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11-25-2022, 09:52 AM | #20 | |
Not Yet Wild
Join Date: Jul 2013
Posts: 37
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Re: Allied Lifepo 48v charger status LED remains green
Quote:
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