Operation Manual

Protect PV.250 Operating Instructions
Page 19 of 51 80000027023 BAL, en
Fig. 7 MPP performance curve
4.5 Partner Operation
In "partner operation", the efficiency of a system with two inverters
can be increased by connecting the two PV cells at less than full power.
If insolation levels fall, the PV cells are connected and only one in-
verter is in operation.
If insolation levels rise, the connection is terminated. Now both in-
verters are in operation. Each inverter is supplied with power by its
associated PV cell.
4.5.1 Linked Operation
One inverter is switched on and is feeding power into the mains.
The other inverter is logically switched off. The tie switch is closed.
The inverter which is active in linked operation changes daily.
This operating mode is active when insolation levels are low.
Fig. 8 Linked operation in partner operating mode
Change of status to single operation:
If capacity utilisation in the inverter which is switched on rises
above a certain value, once a delay has elapsed, the two inverters
are switched to single operation.
First, the inverter which is switched on is switched off. Then, the tie
switch is opened. Once the tie switch is open, both inverters are
switched on.
Change of status to linked operation in the event of a fault:
In the event of a deactivating or self-acknowledging fault in the in-
verter which is switched on, the two inverters are switched to
linked operation.
The inverter which is switched off is switched on. The faulty in-
verter is shut down due to the fault.