At least I think so. I am a newbie at this so bear with me. I installed a Daly 4s 3.2v 100A BMS on my 200A aluminum case cells. Just as I did this my 70A alternator failed due to worn out brushes. This caused a lot of consternation because of the timing ??. I replaced with a large case 120A alternator with a external smart regulator that uses alternator temp.
Anyways i kept experiencing voltage and current fluctuations. I would go to bed with my battery’s seemingly low at 13.06. Hen wake up in the morning at 13.20 with the reefer running all night. Then it didn’t seem to be getting a good charge. But I saw 50-60A at the beginning of the alternator startup. But I would end up with my batteries at13.15 after charging for two hours. So today I checked my current output and it was only 25A with the batteries sitting at 13.06. I disconnected the BMS and the out put into the batteries shot up to 60-70A. Kinda where I would expect from a big alternator. And all my voltages seem right now, and not fluctuating.
to me it seems like the BMS was wonky.
Anyways i kept experiencing voltage and current fluctuations. I would go to bed with my battery’s seemingly low at 13.06. Hen wake up in the morning at 13.20 with the reefer running all night. Then it didn’t seem to be getting a good charge. But I saw 50-60A at the beginning of the alternator startup. But I would end up with my batteries at13.15 after charging for two hours. So today I checked my current output and it was only 25A with the batteries sitting at 13.06. I disconnected the BMS and the out put into the batteries shot up to 60-70A. Kinda where I would expect from a big alternator. And all my voltages seem right now, and not fluctuating.
to me it seems like the BMS was wonky.