How to Solve the Connection Issue Between BT-2 Bluetooth Module and DC-DC MPPT Battery Charger?

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. 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.

Before You Start: Check BT-2 Compatibility

Before repeating the reset process, confirm that your exact charger model appears in the compatibility list for the Renogy BT-2 Bluetooth Module. A charger shown in Renogy’s DC-DC battery charger lineup is not automatically compatible with BT-2.

• BT-2 works with select Renogy devices that use an RS485 communication port.
• BT-2 and BT-1 are not interchangeable. BT-2 uses RS485, while BT-1 uses RS232/RJ12.
• Use the Renogy DC Home App to add and monitor compatible devices. The older Renogy BT App is no longer supported.
• Make sure BT-2 is connected to the charger’s correct RS485 communication port.

If BT-2 Still Won’t Connect

If the connection does not return after completing the reset steps above, check the following before contacting support:

1. Move your phone close to the BT-2 module and confirm that Bluetooth is turned on.
2. Close and reopen the Renogy DC Home App, then try adding the device again.
3. Check that the app has the Bluetooth and other required device permissions on your phone.
4. Inspect the communication cable and make sure both ends are fully seated.
5. Confirm that the charger has stable power before trying to connect BT-2 again.

If BT-2 still cannot connect, note the DC-DC charger model, BT-2 model, app version, indicator-light status, and any error message or screenshot. Providing these details through Renogy Support can help narrow down the issue more quickly.

BT-2, BT-1, and Battery Shunt 300: What’s the Difference?

Renogy Bluetooth accessories do not all use the same communication method. Check the device type before replacing a module or repeating the pairing process.

If you are troubleshooting a Battery Shunt 300, BT-2 should not be treated as a universal replacement for its Bluetooth connection. Follow the pairing and compatibility instructions for the Shunt 300 itself.