three-phase storage systems

Three-phase power storage systems have an inverter that is connected to the house network via all three phases. This always distributes the current evenly across all phases. This avoids unbalanced power supply loads in the network. The trend is clearly towards the use of three-phase inverters. The application rule (VDE-AR-N 4105) for the operation of PV systems states, among other things, that single-phase inverters are only permitted up to a system size of 4,6 kilovolt amperes (kVA) per phase. If the output of the PV system is over 4,6 kVA, a 3-phase inverter must be used.

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