I have a Cerbo GX, BMV-712, and 4 x SmartSolar 75/15 MPPT controllers.
Bulk/Absorption Voltage: 14.4
Float Voltage: 13.4
Max Absorption time: 6 hours
Tail Current: 6.0A
Some of the controllers (sometimes one, sometimes two or three) often go into float before the 6.0A tail current is reached (as recommended for my battery bank), while the others stay in absorption mode. The controllers in absorption mode cannot finish the charge cycle (because they cannot maintain 14.4V until tail current is < 6.0A) and the controllers in "Float" mode are not producing (0W) because they are waiting for the voltage to drop to 13.4.
I was under the impression the the Cerbo would coordinate the controllers so they would act in unison. Perhaps I missed a setting?
I am running firmware 2.54 on the Cerbo GX and cannot upgrade yet because I am waiting to get a question answered about using a powered hub since I will lose one USB port currently in use with firmware greater than 2.57. I have read the release notes for later firmware and it does not seem to mention this issue.
Any thoughts on what to look for would be greatly appreciated.