Turn off the AC (alternating current) side. You can do this in the electrical panel by switching off the solar power group (recognizable by the Zonnefabriek sticker).

Then go to the inverter. On the bottom of the device, there is a rotary switch (circled in red in the photo below). Turn it from '1' to '0'.

Now, the device is switched off on both the AC and DC sides, but there is still residual voltage in the capacitors. You can see this from the LED lights. After about half a minute, the lights will turn off, and the device will be completely de-energized.

Now, we will restart the device, beginning with the DC side by turning the rotary switch back to '1'. If it is set correctly, the lights and display will turn on again.

Finally, we return to the electrical panel and switch the ‘Solar Power’ group back on by pushing the switch up.

After some time, communication with the portal server should normally resume. Note: The graphs for daily, monthly, and yearly yields take a bit longer to reappear. Usually, they become visible again on Mijn Zonnefabriek and the Zonnefabriek app after a few hours.