iveky3

My twingo ev starts reducing charging power already at 60%.... for example under 50% it charges full 22kW, above 60 it reduces already around 16kW, at 80% it is around 12kW and at 90% it is already below 10! and so on...

@charlez - I don't think the suppliers are even aware of this issue with the inverter!
Here is the circuit

The heart of the isolater, is the LD03-16B12 (AC/DC Converter Vin = 90-528VAC (100-745VDC) Vout = 12V 250MA).  Since I have 2 banks of panels consisting of 400W panels capable of delivering more than 20A in total, I had to use a 30A relay.  If you have smaller panels, you can use a smaller relay.  Just make sure that the coil resistance of the relay is more than 70 Ohms to limit the current draw from the AC/DC converter.
Of course you can also use any other type of DC/DC (or AC/DC) converter.  As long as it can handle a relatively high input voltage with an output current of around 250mA at 12V (Or whatever voltage you desire to trigger the relay)
I hope this is useful for everybody who experiences Error 08 while the PV panels are very wet and the inverter is in bypass mode...