Nevermind, found it, thx. 
http://www.weewx.com/docs/customizing.htm#Adding_2nd_source

Am Montag, 4. Februar 2019 16:05:51 UTC+1 schrieb Michi Kaa:
>
> I think I've understood the point of your posting but stll need a little 
> bit of an input, since I don't really understand what a REC event is, how 
> to configure one an how to bind it. Is this all pointed out in the 
> user/customisation guide? Where can I find further explanation?
>
> Am Montag, 4. Februar 2019 15:22:24 UTC+1 schrieb Andrew Milner:
>>
>> You could have your task create a text file and have a service that binds 
>> to a REC event, reads the text file and adds the radiation to the archive 
>> record.  Weewx would then take care of the daily stats in 
>> archive_day_radiation for you.
>> Alternatively your service could still bind to the REC, but instead of 
>> reading the text file it could retrieve via the API the current radiation 
>> value and thus do away with the cron task altogether.
>>
>>
>>
>> On Monday, 4 February 2019 13:27:27 UTC+2, Michi Kaa wrote:
>>>
>>> Hi,
>>>
>>> I run weewx on a raspberryPi with a WS28xx station. I also have a 3kW 
>>> peak solar panel on the roof of my house. The solar power inverter logs a 
>>> lot of data which can be read over a JSON API. So what I am doing right now 
>>> is running a cron job every 5min that looks into the weewx database for 
>>> archive entries without a radiation value, then asks the inverter for the 
>>> values for that particular time window and stores it into weewx database 
>>> and calculate archive_day_radiation also (is this calculation needed or is 
>>> it made automatically, when "radiation" column in "archive" table has 
>>> values?).
>>>
>>> This works. But is there an "official" way to do things like that?
>>>
>>>
>>>

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