I am sorry that you are experiencing connection issue between the 50A DC-DC MPPT battery charger and the BT-2 Bluetooth module. Please following the step by step guidelines below to restore the Bluetooth connection.
1. First, disconnect the BT-2 Bluetooth module from the DC-DC MPPT battery charger.
2. Second, disconnect the DC-DC MPPT battery charger completely from the system (solar panel, starter battery, alternator, etc.) and wait until there are no longer flashing/solid lights as there may be a delay.
a) Once off, let it rest for approximately 30 seconds.
3. Next, reconnect the house battery to the DC-DC MPPT battery charger first then reconnect all other components (solar panel, starter battery, alternator, and etc).
4. Finally, plug in the BT-2 Bluetooth module to the RS485 communication port on the DC-DC MPPT battery charger and use the DC Home App on your phone to add this device.
If this did not solve your connection issue between the 50A DC-DC MPPT battery charger and the BT-2 Bluetooth module, please contact us by email or give us a phone call, we will be glad to provide further technical assistance. Again, I apologize for the inconvenience and hope you have a wonderful day.