Hello !
I build this exact battery (same BMS and cells) as in :
I have issue to charge it to the top with an all in one MPTT chargeur-bosster able to charge from solar panel and also a car alternator.
The batterie is at 13.0 V SoC and thus not accepting any Amp when charging (well 0.1 to 0.4 A so very little compare to its 105Qh capacity).
When the engine runs, the eng-battery and alternator voltage is 13.8 and the aux battery goes up to 13.4... though it's not accepting much amp.
Seems like it comes from the charger as with an epever MPTT solar charger I can charge up to 5 A with a small solar panel.
I don't know where to see now. But from the booster LED I can see it tries few times to absorption-stage charge the battery:
the voltage go up for a short time and it accept like 5 A for few second (like 3s) but then stop.
After 1 second, the booster try again charging and the same happen.
After like 5-10 try, the charge goes in mode bulk charge and I have no more than 0.3 A going into the batterie.
It seems to me that the BMS open the circuit when the booster try the boost charge. But the BMS is set to allow up to 3.65/cell and 14.6 V total pack (I setup this via bluethooth).
Also this does not happen with the solar charger.
Any idea why ??
Thanks a lot for your help !!
I build this exact battery (same BMS and cells) as in :
The batterie is at 13.0 V SoC and thus not accepting any Amp when charging (well 0.1 to 0.4 A so very little compare to its 105Qh capacity).
When the engine runs, the eng-battery and alternator voltage is 13.8 and the aux battery goes up to 13.4... though it's not accepting much amp.
Seems like it comes from the charger as with an epever MPTT solar charger I can charge up to 5 A with a small solar panel.
I don't know where to see now. But from the booster LED I can see it tries few times to absorption-stage charge the battery:
the voltage go up for a short time and it accept like 5 A for few second (like 3s) but then stop.
After 1 second, the booster try again charging and the same happen.
After like 5-10 try, the charge goes in mode bulk charge and I have no more than 0.3 A going into the batterie.
It seems to me that the BMS open the circuit when the booster try the boost charge. But the BMS is set to allow up to 3.65/cell and 14.6 V total pack (I setup this via bluethooth).
Also this does not happen with the solar charger.
Any idea why ??
Thanks a lot for your help !!