Sonnen sonnenBatterie 10, Installation Instructions Manual, Page: 60 / 100

8 | Using digital inputs/outputs (optional)
60 / 100 Installation instructions sonnenBatterie 10
8.2.3 Using additional external electrical generators
If digital output ( DO ) CHP is used, the controls of the storage system activate an external
electrical generator, e.g. a combined heat and power station, as soon as defined charging
state conditions are met.
Function
As soon as the state of charge ( SOC ) of the storage system drops below a defined value
(Charge state to start CHP), the digital output is activated. The digital output and thus the
electrical generator remain activated until the state of charge (
SOC ) of the storage system
reaches a defined maximum charging state (Charge state to stop CHP). Surpluses of elec-
tricity from the electrical generator are used to charge the storage system. In order for
this to be included in calculations correctly when controlling the flows of energy in the
building, the power output of the electrical generator must be recorded (see Recording
constant power of an electrical generator [P. 61]).
Using a combined heat and power station as an electrical generator
If a combined heat and power station is used as an electrical generator, it must be ensured
that it mostly functions as a heat provider, i.e. the highest priority for production is the hot
water supply, while production of electricity generally takes second priority. This means
that when digital output CHP of the storage system is activated, the combined heat and
power station may not start producing electricity immediately.
Configuring settings
The switching behaviour of the digital output is controlled using the commissioning assist-
ant.
„
Set the lower limit of the charging state at which the digital output and therefore the
electrical generator are activated (Charge state to start CHP).
„
Set the upper limit of the charging state at which the digital output and therefore the
electrical generator are deactivated (Charge state to stop CHP).
Application example
1 CHP
2 Contact for activating CHP unit
K2 External relay
Activating and deactivating a CHP unit
The combined heat and power station (1) is activ-
ated or deactivated using digital output CHP. The
prerequisite for this is that the CHP unit must be
available via a suitable interface (2) for activation/
deactivation.