- When the consumption in the building is switched off, it is necessary to switch on a single-phase appliance on each of the three phases. The inverter shall maintain power at 0 W at the house meter foot for each of the three phases.
- If the smartmeter shows a draw on one phase and an export to the grid on the other, it will indicate a swap of these phases and a repair is required.
- Without this check, the malfunctioning asymmetry will show up on the energy supplier's bill.