Hi, I am trying to activate an equalization charge for a lead acid battery using a MPPT 75/15 controller.
The setup is used on a tower that provides Internet access. The tower is located on a mountain that is difficult to access physically. I have used an Arduino with an Ethernet shield connected to the TTL serial port of the charge controller and then patched onto the Ethernet network of the tower. I monitor the battery and solar panels and change settings as needed remotely.
It looks like the controller does not support manual equalization activation therefore I have tried to set the controller to do an equalization charge once a day (which I will take off once the equalization charge is performed) by setting register 0xEDFD to 1.
The problem is that the controller seems to merely extend the duration of the absorption charge to it's maximum time (6 hours for initial voltage less that 11.9) even if the current falls below 1 Ampere. The voltage still stays at the absorption level (14.38V) and does not increase to the equalization voltage. After the absorption stage the controller activates float charging.
The firmware version on the controller is 1.16.
Any help would be appreciated very much.