Hi, sorry for late response,
What is BTS, ACCU, Inverter?
BTS is A base transceiver station (BTS) is a fixed radio transceiver in any mobile network. The BTS connects mobile devices to the network. It sends and receives radio signals to mobile devices and converts them to digital signals that it passes on the network to route to other terminals in the network or to the Internet.
ACCU ( battery ) is a battery that can be restored to full charge by the application of electrical energy.
and Inverter are also called AC Drives ( LOAD ), or VFD (variable frequency drive). They are electronic devices that can turn DC (Direct Current) to AC (Alternating Current).