House using 3 phase AC (some things wired to one phase, some things wired to all three active legs/lines), grid supplying 3 phase AC (440 V domestic), PV panels producing DC current, a battery system that stores DC, and then you need some smarts.Approach A: three sets of PV panels each with their own inverter (DC to single phase AC) so that the synchronising between the phases is done by the gridApproach B: one set of PV panels with an expensive inverter (DC to 3 phase AC)Approach C: one set of ...