Large power reading when connecting solar panels to plugwise

[Roma65]

I've installed the plug wise_util and it works fine for "normal" circles. When you attach a device it reads the power correctly.

On one of the circles i've connected my solar panels. I would expect a negative power reading. eg -130Watt since i'm generating power and not consuming power.

Instead i get a big power reading eg 123651.6 watt. Any ideas how to fix this ?

Next to that when the solar system switches off because the is no sun it get two different error messages:

1. Error: device reports readiness thread but returned no data
2. timeout while waiting for response from device

Any ideas what is causing this. Normally when there is no device connected to a circle it reads 0 watt