Have a question for ES on a used LiFePO4 battery (48V, 20 AH Golden Oasis). It seems to self discharge. Is this consistent for LiFePO4 technology?
In the first hour after charging with no load (20 ma voltmeter) it drops from 57.97 V to 57.00 V. It further dropped to 56.74 V in the next two hours. The next morning it had dropped to 55.64 in the first hour of monitoring.
It seems like it might be the BMS that is using the power, or redistributing it. When the volt meter is attached, it shows the previous voltage, but quickly reduces to the numbers I posted to you above. I was testing every ten minutes, about a volt every hour reduction. And again, there was a 20ma draw on the volt meter, but I would assume that doesn't account for the large voltage drop.
I ran my hub motor and the battery went down to 52.6 V, and it hovered around that voltage, back and forth between 52.6 and 52.5. Then I came back maybe 10 minutes later and it had gone up to 53.1V.
Is this behavior consistent with a one year old LifePO4 battery/BMS with approximately 50 charge cycles? Thanks in advance for any insights.
Best,
Joe Mc
In the first hour after charging with no load (20 ma voltmeter) it drops from 57.97 V to 57.00 V. It further dropped to 56.74 V in the next two hours. The next morning it had dropped to 55.64 in the first hour of monitoring.
It seems like it might be the BMS that is using the power, or redistributing it. When the volt meter is attached, it shows the previous voltage, but quickly reduces to the numbers I posted to you above. I was testing every ten minutes, about a volt every hour reduction. And again, there was a 20ma draw on the volt meter, but I would assume that doesn't account for the large voltage drop.
I ran my hub motor and the battery went down to 52.6 V, and it hovered around that voltage, back and forth between 52.6 and 52.5. Then I came back maybe 10 minutes later and it had gone up to 53.1V.
Is this behavior consistent with a one year old LifePO4 battery/BMS with approximately 50 charge cycles? Thanks in advance for any insights.
Best,
Joe Mc