Why is JK BMS in idle consuming 1,5A non stop?

banne · Feb 24, 2024

I have a JK BMS connected to a 48v 16S LFP batterypack. When the battery is 100% it starts balancing (from 3,4v) but next morning I lost 9% of power from the batteries. Just because it keeps using 1-1,5A non stop. Why is this happening? The power in the Multiplus is set to 0W so I should say it should be idling, min/max voltage diff is 5mv so it does not need to balance anymore.

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LakeHouse · Feb 24, 2024

banne said:
I have a JK BMS connected to a 48v 16S LFP batterypack. When the battery is 100% it starts balancing (from 3,4v) but next morning I lost 9% of power from the batteries. Just because it keeps using 1-1,5A non stop. Why is this happening? The power in the Multiplus is set to 0W so I should say it should be idling, min/max voltage diff is 5mv so it does not need to balance anymore.

View attachment 198117 View attachment 198118

The short answer: Your BMS is not burning that power.
It would get pretty how if it was burning 70W constantly.
That 1.39 A is either the idle draw of everything else in your system (likely), or a calibration error (less likely).

Why is JK BMS in idle consuming 1,5A non stop?

banne

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LakeHouse

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