Hello,
I’m using BQ24650 to charge 4 LiFePO4 batteries in series (14.4V) with power supplied by solar PV panel. The MPPSET point is set to 17.2V, according to the PV panel’s spec.
Well after much effort the charger now works pretty fine as expected, except when at very low sunlight, the BQ24650 starts draining power from the batteries instead of charging them. The current drained is measured 6mA constantly, the voltage of the PV panel is measured approximately 15V at this time, and current from PV panel is about 2mA or so.
However the discharging current will stop when sunlight is completely removed.
How can I eliminate this discharge current? As 6mA power drain is quite undesired. And I suspect the battery detection procedure within the BQ24650 is causing this drainage. Does anyone experiences this same behaviour?
Thanks very much if anybody can help me out of this.