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User Manual 3000SP
Rev. 1.1 16/03/2021
Identification: MD-AL-GI-00
Rev. 1.1 of 16/03/2021 - Application: GID
7.
Connections in three-phase mode
The 3000SP storage inverter is a single-phase inverter, but it can be installed on a three-phase system by
feeding and withdrawing power on a single-phase, with the aim of zeroing the vector sum of the powers
of each phase ready by the import/export meter. In order to use this mode, it is necessary to have PV
production generated by a three-phase inverter.
Figure 41 – Installation of a 3000SP storage inverter on a three-phase system
In the example shown in Figure 41 - Power flows in a 3000SP storage inverter on a three-phase system, the
inverter is installed on phase L3 (washing machine), however, the loads installed on the other two phases
(lighting and refrigerator) are also taken into account for its automatic operation, and the balance of power
flows takes into consideration the entire photovoltaic production and the absorption of all the loads.
For example, if we assume a three-phase system and a photovoltaic production of 6 kW, and take into
account the values shown in the figure, we can say that:
In phase L1, the loads are absent and the power produced is fed into the grid.
In phase L2, 5 kW are requested, of which 2 kW are supplied by the photovoltaic system and 2 kW are
taken from the grid.
In phase L3, where the storage inverter is installed, the loads absorb a power of 4 kW; this request is
met partly by the photovoltaic production (2 kW) and partly by the batteries (3 kW). In any case, instead
of only delivering the 2 kW needed to meet the requirements of the loads on the phase, an additional 1
kW is also delivered, which is then sold to the grid to balance the greater absorption on phase L2.
