JunglePower
New Member
Hello fellow solar gatherers,
I am totally off-grid on an island. I have two BB powered systems. In one location are eight BB10012 in series/parallel 48vdc and the other six of the same for 24vdc. The eight in the 48vdc system have been operating flawlessly. I'm very pleased.
However, I have been having issues with the 24vdc system in another property where I do not live. I think the system has not been monitored as it should as the occupants were not vigilant with the system and had numerous LVD episodes. Numerous times I went over to find out what was wrong and found one or two 10012s at 10vdc. I balanced them individually and for about a week they seemed fine. Recently I found two suspect batteries that I brought back to my place to "bench." One had a loose + terminal. I could pivot it back and forth, circuit opened and closed. The other, although reading 12.8vdc will not take a charge, not a trickle, not a high-amp boost. I had been in contact with Aaron at BB a few times but alas, the expense of trying to get the faulty batteries back to the 'states would not be feasible.
I cut out the case around the loose terminal using Will's "BB tear-down" video as a guide.
. Sure enough, the bolt through the + bus bar to the terminal post was loose and there was evidence of overheating. I also noticed the terminal post is bolted to a black plastic strip on the inside edge of the bus bar and the bolt itself conducts the current as the post does not directly contact the bus bar. I removed the terminal post, cleaned and shined the bolt, double nuts and the bus bar, bolted it together and it charged fine. However, it really drew a lot of amps to start, over 50 measured with a Klein amp clamp on the - lead of the charger. The post got warm, almost hot to the touch until the current dropped to 40adc then hours later to nil. So I saved that battery, questioning WHY the terminal post is mounted on plastic????? The current path is only through the head of the bolt!
The other battery refuses to charge. It indicates 12.8vdc and as above, it will not wake-up to receive a charge. Any suggestions? My main charger is a Powermax 75LK Converter/Charger.
I have learned the string of 24vdc controllers were not set high enough for proper balancing which I will quickly remedy. Seems the balancing of the cells at 14.4vdc was not emphasized by BB user instructions in the past. I have insured my string of eight 48vdc gets topped to 58.3vdc occasionally. I have set the 24vdc so it can reach 29.4vdc on occasion.
So I did repair the one battery with the loose terminal but the other refuses charging. Any suggestions? Thanks for your time!
I am totally off-grid on an island. I have two BB powered systems. In one location are eight BB10012 in series/parallel 48vdc and the other six of the same for 24vdc. The eight in the 48vdc system have been operating flawlessly. I'm very pleased.
However, I have been having issues with the 24vdc system in another property where I do not live. I think the system has not been monitored as it should as the occupants were not vigilant with the system and had numerous LVD episodes. Numerous times I went over to find out what was wrong and found one or two 10012s at 10vdc. I balanced them individually and for about a week they seemed fine. Recently I found two suspect batteries that I brought back to my place to "bench." One had a loose + terminal. I could pivot it back and forth, circuit opened and closed. The other, although reading 12.8vdc will not take a charge, not a trickle, not a high-amp boost. I had been in contact with Aaron at BB a few times but alas, the expense of trying to get the faulty batteries back to the 'states would not be feasible.
I cut out the case around the loose terminal using Will's "BB tear-down" video as a guide.
The other battery refuses to charge. It indicates 12.8vdc and as above, it will not wake-up to receive a charge. Any suggestions? My main charger is a Powermax 75LK Converter/Charger.
I have learned the string of 24vdc controllers were not set high enough for proper balancing which I will quickly remedy. Seems the balancing of the cells at 14.4vdc was not emphasized by BB user instructions in the past. I have insured my string of eight 48vdc gets topped to 58.3vdc occasionally. I have set the 24vdc so it can reach 29.4vdc on occasion.
So I did repair the one battery with the loose terminal but the other refuses charging. Any suggestions? Thanks for your time!