Wondering if anyone has had this issue.
I have two B300’s. Purchased two years ago. I added recently an AC500 and B300S. I have removed the AC300 from the system for the winter. With all three batteries charging I noticed that both B300’s were not charging properly and would have much lower SOC’s then the B300S and would not sync up. Sometimes one or both would stay in Standby although sufficient charging current was available. When PV became available in the morning only battery 1, the B300S, would turn on. Took system to Zero SOC and charged to 100%. No improvement.
Recently we noticed a strong smell like a dead mouse in the room. No mouse was found. Today the smell returned and I found it coming from the Bluetti system. I removed the AC500 and B300S. I thought it was a blown capacitor in the AC500. Removing plate for a view of the main circuit board revealed nothing.
I charged the two B300’s with the AC300 using PV and AC when available from my rooftop SMA system. It is set to output charging AC when the SMA inverter is producing over 900 watts. AC current set to 3 amps or about 600 watts. Went for a walk in the small window of sunshine opportunity we had.
The smell returned. Removing the end panels of the B300’s did not really reveal the bad one although I suspect one in particular.
I am now charging one at a time to see if I can identify a battery that vents. I applied 5 amps AC to each one individually for 10 minutes and monitored.
Battery 2 went from 49% to 82% in 5 minutes and stayed at 82% for the next 5 minutes.
Battery 3 went from 31% to 81% in 7 minutes and 82% in 9 minutes where it stayed.
Working mode PV priority UPS with Battery High set at 85%. No PV input.
No smell detected.
Will check with PV input. I have two T500’s I can use for 51 VDC PV input since sunlight is lacking.