This Error occurs when the internal bus voltage exceeds its expected limits.
This can be caused by several causes, one of them is that both the solar and battery module are trying to create/maintain the internal bus voltage, causing the voltage to rise rapidly.
- Check the PowerRouter firmware and update if needed.
- Switch off solar (using the Solar disconnect switch) and restart the PowerRouter (Menu, service, restart). After the PowerRouter has grid connection, wait a few minutes and switch on solar.