Hi , i’ve buyed a lifepo4 165 ah bluetooth for my van and i’m tryng to charge It with a Blue smart ip67 12/20 . The battery at the beginning of the charge , has a 30% of state of charge.
You can see the First phase Is during only 5 second to pass immediately in absorbe for 2 hours. With this predefined settings , the battery After 2 hours stay in floating for too many hours , and After over 24 hours the battery Is not already fully charged.
My answer Is, why the bulk or First phase during only few second ?
How can i set the charger? I’ve try to aument the voltage of absorbing at 14.6 v , but the result Is the same, bulk for few second, absorb for 2 hours and and infinite floating.
The usual reason for a short bulk time is you have a poor connection with high resistance and voltage drop between the MPPT and the battery. This could be a loose connection, poor crimp, poor fuse or breaker, isolation switch not making contact, wires too thin or too long etc. Check your wiring both positive and negative. Use a multimeter. The high resistance means that the voltage at the MPPT increases immediately to the absorption voltage of 14.6V even if the battery is only at 13.1V.
Is possibile the BDS180( an automatic selector/parallelator for 2 BS) can give this problem ? In effect, the manual says lifepo aren’t supported. But now i have sected It on manual, on the only BS i have mounted.
If the BDS180 does its own charge conttol (current / voltage control) then that would interfere with the IP67 and give odd results. I do not know the BDS180 so I can not comment further.
