@pietmulders
I have got an ATAG One (and ATAG I28EC) installed the 6th of November, and have not yet seen this behavior.

I did have a problem last week, when my internet connection was down for about 2 hours (Maintenance bij ISP)
The current implementation in Domoticz uses the ATAG Portal to ...

Has anyone looked into the ToonAPI already?

http://www.toonapi.com/

Is this of any use for Domoticz?

Too early. I now see there will be a ToonAPI launchparty on december 4:

https://www.eventbrite.com/e/launch-party-toon-api-tickets-19332385686

I found some more information about the API here ...

Hi Yobby,
Can you explain more how to implement in Domoticz because this is a better way as through PVoutput

First you need a virtual device to gather the data. If it was working before and you already have a device with SolarEdge data, you may be able to use that instead.

goto Setup ...

Perhaps someone can implement a new SolarEdge module which retrieves data via the SolarEdge API

API speccification: http://www.solaredge.com/files/pdfs/se_ ... ng_api.pdf