Outback NC106 battery issues - wont charge
I installed a solar energy system in my farm last December. I have three banks on four 12 V NC016 batteries, two installed originally and one added in March. One of the batteries in original strings started corroding at the terminal in march, and by early April Outback had approved replacement under warranty. From there, nothing has happened. I have been unable to get a status update; every time I talk with tech support, I am told that they will tell someone to get back with me, but I never hear back. Their battery expert usually will not answer his phone, but the one time he did, he promised to get back and never did. The local installer here in Nicaragua promised to look into it and get back, but never did. Finally, I learned that they had only one such battery left in stock here. and I went ahead and bought it, since almost three months have gone by and there is still no answer, and my original batteries are now 7 months old. New batteries should be added in the first 6 months if possible
So, I bought the one and only battery, which was manufactured in Feb 2018, same as the third bank I installed in March. It had 12.4 V on it when I received it, so it looked fine. I did the proper prep work the same as for the new bank in March, floating the other batteries for 48 straight hours. I then pulled the corroding battery and installed the new one. It would not charge properly - having gone through absorption for 2 hours and flotation for 10, it still only had 12.5 V, compared to 13.05 for the other batteries in the string. I put about 2.5 kW of load on over 8 hours last night, then the battery was at 12.1 V while the other batteries were at 12.35 V. I then tried the absorption again, and noticed that when I was absorbing at 56.6 V, this new battery only reached 12.9 V. After going through the whole absorption and flotation process again, it was at 12.65 V. I would just keep trying for a week or so, but I noticed that the other batteries in the string were at voltages up to 14.9 V during absorption, and I am afraid that could damage them. I am confused why there should be such a problem with this battery, since the four batteries from the third string I put in last March charged up totally normally and have worked fine since.
Any ideas guys? The Outback battery expert has not called, emailed or answered my calls. I got Tech support, but that guy said he had only been working for four weeks and had no idea what was wrong or what to do, but the battery expert could call me, he took down my information but still I have not heard back. The local installer here in Nicaragua has no idea what to do.