AC-coupled solution, which can upgrade existing three-phase PV system to store energy. This solution can modernize any three-phase PV system, providing the ability to store power or operate with the back-up of batteries, ensuring interactivity or grid independence. It is compatible with high voltage Li-Ion batteries ranging from 180 to 600V and it is also equipped with the UPS function. It can reach a high efficiency of up to 97.5%. It includes a Battery Input Reverse Polarity Protection as part of its set of protections.