Operation manual
Page 19 of 37
Generation > Consumption
If the generation of PV power is higher than the consumption such as at midday, there is
a surplus of electrical energy. In this case the surplus energy is used to charge the
battery of the storage system.
If the entire portion of the surplus cannot be charged into the battery, the remaining
surplus is fed into the public electricity grid.
Consumption > Generation
If the consumption is higher than the generation of PV power such as in the evening,
there is a deficit of electrical energy. In this case the battery of the storage system is
discharged to even out as much of the deficit as possible. If the entire deficit cannot be
compensated by discharging the battery, the remaining deficit is covered by the public
electricity grid.
The storage system also acts as a backup power supply, meaning that if the utility grid
goes out, your appliances will be powered by the batteries of the storage system
conditioned upon installer connection of back up function.
4.1.2
Backup mode
Figure 5: sonnenBatterie Evo Connection Concept