This is all I see in the manual:
3. How to Connect via Bluetooth
Please ensure your device’s Bluetooth setting is turned on.
Select:
Configuration > Search Devices > Device
The green indicator on the BT-1 will turn on once it has successfully connected to the power.
The blue indicator on the BT-1 will blink once it has successfully connected and during communication.
It is the BT-1 that is not turning on right? Only 3 possibilities. Problem with power to the controller connector, problem with the cable, BT-1 is defective. I would be calling Renogy.