Maheswari, G.Manjunatha Sharma, K.M.P, P.2026-02-032025International Journal of Electronics, 2025, , , pp. -207217https://doi.org/10.1080/00207217.2025.2571987https://idr.nitk.ac.in/handle/123456789/20611Multi-level inverters without transformer coupling are growingly popular for solar uses because of their compact design, minimised voltage stress, and improved efficiency. In this paper, the proposed novel triple-boost 7-level inverter is optimised for seamless integration with the grid. The proposed inverter employs self-regulating switched-capacitors to achieve a threefold voltage amplification, effectively eliminating the need for an independent boost converter stage. This architecture benefits low-voltage PV systems by improving efficiency, reducing cost, and ensuring superior performance. Moreover, the 7-level inverter adopts a common-ground topology, effectively mitigating leakage currents in PV system applications. The paper elaborates on the operational modes of the proposed inverter and the design of a current controller tailored for a grid-tied PV-based seven-level inverter. Additionally, simulation and experimental validation are conducted utilising hardware-in-the-loop (HIL) methods to evaluate system performance. Finally, a comprehensive comparative analysis is presented between the proposed seven-level inverter and existing seven-level inverters, highlighting the advantages of the proposed inverter design. © 2025 Informa UK Limited, trading as Taylor & Francis Group.CapacitorsControllersDC-DC convertersEfficiencyElectric invertersIntegrated circuit designLeakage currentsCurrent controllerDesign and implementationsGrid-tiedHardware in the loopsMultilevelsPhotovoltaic systemsPV systemSeven-levelSeven-level inverterTransformer-lessElectric current control