Q on Demand 24/7

If the “Q on Demand 24/7” function is activated for longer than 24 hours, a self-test is performed. The inverter is disconnected from the utility grid for a few minutes. The self-test should be carried out at a time when the sun is shining. As soon as enough DC power is available, the PV inverter starts operating again. The time for the self-test is set via the parameter Time of cyclic insulation measurement.

The general setting of the grid management services (e.g. cos phi setpoint or Q(V) characteristic curve) can not be fully set independently of the "Q on Demand 24/7" function via the relevant parameters - "Q on Demand 24/7" only permits Q specifications. It is to be noted here that certain settings can have an influence on other grid-support settings and functions.

This means that if the "Q on Demand 24/7" function" is active, no other grid-supporting functions (e.g., cos phi) are possible between day and night operation of the inverter. Should an independent reactive power provision be desired between day- and night operation, the reactive power provision must be communicated to the inverter via a superordinate control unit.

The function "Q on Demand 24/7" is not compatible with the reactive power modes cos φ(P) charac. curve or cos φ(V) charac. curve.

The provision of reactive power can only be read off in the instantaneous values (GridMs.TotVAr, Reactive power) or requested via Modbus.

You can set the reactive power mode using the following parameters.