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Product description | 3
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Consumption > Generation
If the consumption is greater than the generation of power, there is a deficit of electrical
energy. In this case the battery is discharged to even out as much of the deficit as possible.
If the entire deficit can not be compensated by discharging the battery, the remaining de-
ficit is covered by the public electrical grid.
3.4.2 Feed-in limit
PV systems are subject to a feed-in limit in some circumstances. The feed-in limit restricts
the PV system’s feed-in power at the mains connection point.
Example
Nominal power of PV system: 10 kWp
Power limit: 50%
Maximum feed-in power: 5 kW
In this example, the feed-in power of 5 kW must not be exceeded. The following figure
shows an example of the PV system’s production over the course of a day.
50%
P
t
1
4
3
2
12:00
Illustration 2: Example: feed-in limit at 50% of
nominal power
1 Charging of storage system
2 Switch-on of consumers via
self-consumption switch
3 Switch-on of consumers via
sonnenSmart plug
4 Midday peak, which must not be
fed into the electrical mains
To prevent production reduction – and therefore
energy loss – the excess energy is first stored in the
storage system (1) and consumption is increased by
switching on consumers (2, 3). Production is only
reduced if these measures do not lead to the de-
sired limit.
Measures for limiting feed-in are explained in detail in the following. The individual meas-
ures are carried out one after the other. Only when one measure does not achieve the de-
sired reduction is the next measure introduced.
1. Charging of battery
Excess energy is directed to the storage system battery. In order for this to occur, there
must be sufficient storage capacity available in the battery. For this reason, on sunny days
it is often a good idea to reduce the charging power in the morning hours in order to re-
serve sufficient remaining capacity of the battery for midday. The charging behaviour is in-
telligently controlled for this purpose (see Intelligent charging management [P. 14]).
2. Activation of the self-consumption switch
Consumers connected to the permanently wired switch output are switched on here.