Renogy BT-2 Bluetooth Module. The Renogy BT-2 is the new generation Bluetooth module for select Renogy solar charge controllers, DC-DC battery chargers, smart lithium batteries, and inverters. Powered by its RJ45 communication port, the BT-2 provides wireless monitoring of the system data and allows users to change parameters through the Renogy DC Home smartphone App. The Renogy DC Home App can help make your off-grid power system smarter by giving you access to configure, monitor, update, and diagnose your Renogy products from the convenience of your smart phone or tablet. Dimensions approx. 67.3 x 35 x 14mm. Cable length 5m.