Do I have to have the balcony power station checked by an electrician?

Up to a system output of the inverter of 639W/2.6A there is no danger for the existing house electrics. However, if you live in a household with old screw-type fuses, it is advisable to replace them with smaller fuses. If you still want to have the electrical system checked, we recommend having an electrician check the house electrical system in accordance with DIN VDE 0298-4.