3 Description of the device
3.1 Mode of operation
The device converts the DC voltage generated by the PV-modules into AC voltage and feeds this into the power grid. The
starting procedure begins when there is sufficient sunlight and a specific minimum voltage is present in the device. The
feed-in process begins once the PV generator has passed the insulation test and the grid parameters are within the re-
quirements imposed by the grid operator for a specific monitoring time. If, as it gets dark, the voltage drops below the
minimum voltage value, feed-in mode ends and the device switches off.
3.2 System layout
PV generator
PV generator
Inverter with
DC isolator switch* &)
circuit-breaker
Load
Feed-in meter
Reference
counter
Grid monitoring point
Line protection
Line protection
Selective
main switch
Selective
main switch
Inverter with
DC isolator switch* &)
circuit-breaker
Fig.1: Circuit diagram of a system with two inverters
Key Definition / information on the connection
PV generator The PV generator converts the radiant energy of sunlight
into electrical energy.
Inverter with circuit-breaker The PV generator is connected to the device's DC connec-
tion.
Line protection The circuit breaker is an overcurrent protection device.
Feed-in meter The feed-in meter is to be specified and installed by the
power supply company. Some power supply companies also
allow the installation of your own calibrated meters.
Selective main switch The selective main switch is to be specified by the power
supply company.
Reference counter The reference counter is to be specified and installed by the
power supply company. This measures the amount of en-
ergy drawn.
DC isolator switch Use the DC isolator switch to disconnect the device from
the PV generator.
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blueplanet 7.5 TL3 KACO blueplanet 8.6 TL3 KACO blueplanet 9.0 TL3 KACO blueplanet 10.0 TL3
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