Keywords: SEPIC-ZETA Converter, BSG inverter, AC grid, Photovoltaic. The new inverter uses softswitched frequency unfolder technique to provide soft-switching feature while keeping pulse width modulation (PWM) capability without. This proposed method is implemented using MATLAB simulation and hardware is developed with DSPIC30F4011 controller. The new inverter uses softswitched frequency unfolder technique to provide soft-switching feature while keeping pulse width modulation (PWM) capability without high voltage stress The main obstacle. Also the BBCs can be operated with interleaving to reduce the current ripple of the output inductor. composed of a push-pull type forward converter, an unfold inverter, and a decoupling. The power flow from each battery module is transferred to the AC mains by means of single-stage power conversion. 2.3 Candidate inverter topologies for photovoltaic applications. The proposed BSG-inverter will comply with the power commands which is coming from the central control unit of the BMS to charge or discharge the battery modules. This high frequency pulsating output current of the BBCs will be converted into sinusoidal one with utility line frequency by the DC–AC unfolder of four active switches operated at low switching frequency and an LC filter. Regardless of the type used, all non-resonant HF link inverters. Thus, the power conversion efficiency can be increased. However, a conventional PV inverter requires two-stage power conversion. The inverter requires only 1 controllable switch to obtain 100 Hz pulsating DC-link voltage. It can convert the DC current generated by the battery module into a high frequency pulsating DC current. At the final conversion stage, the voltage is unfolded using a polarity-reversing bridge. The inverter consists of a buck-boost converter and an H-bridge unfolder circuit. BBC consists of two switches, two diodes, and one inductor. 1, all the PV modules are connected to the three-phase inverter. A PWM ZVS High-Frequency-Link Three-Phase Inverter With T-Type NPC Unfolder. This eases the high power MV converter design. The research on the HF-ZSCC is mostly concentrated on two-level inverters. The circuit diagram of the proposed BSG-inverter which is composed of distributed SEPIC-ZETA type DC–DC converters and a DC–AC unfolder. The unfolder inverter inverts this signal to the AC by operating at line frequency, and thus high frequency switching requirement at the MV stage is removed. The proposed BSG-inverter is composed of Bidirectional SEPIC- ZETA type DC–DC converters (BSZS) and a DC–AC unfolder. Abstract: A Bidirectional Single-Stage Grid-connected inverter (BSG inverter) for the battery energy storage system in EV applications using SEPIC-ZETA converter is proposed. Many transformer-less pseudo DC-link inverters with step-up/down feature have been proposed to simplify circui Chien-Hsuan Chang, Kuan-Han Ho IEEE.